35,0(6Original Instructions

MicroSpotMonitor MSM+ HB10

MicroSpotMonitor+ HighBrilliance
MSM+ HB10, MSM+ HB20
LaserDiagnosticsSoftware LDS

Revision 01 EN - 01/2023

35,0(6MSM+ HBIMPORTANT!
READ CAREFULLY BEFORE USE.
KEEP FOR FUTURE USE.

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Table of Contents
1

Basic safety notes

92

Symbols and conventions

11

3

About this operating manual

124Device description

13

4.1
4.2
4.3
4.4
4.5
4.6
4.7

Device types............................................................................................................................13
Functional description..............................................................................................................13
Measuring principle..................................................................................................................15
Measurement Range of the MSM+ HB.....................................................................................16
4.4.1
Measurement Range of the MSM+ HB10..................................................................16
4.4.2
Measurement Range of the MSM+ HB20..................................................................17
Optical displays .......................................................................................................................18
Explanation of the product safety labels...................................................................................19
Scope of delivery and accessories...........................................................................................21

5

Quick overview installation

22

6

Transport and storage

23

6.1
6.2
6.3
6.4
6.5
6.6
6.7
7

Mounting
7.1
7.2
7.3

7.4
8

Warning messages...................................................................................................................23
Removing transport lock..........................................................................................................24
Installing transport lock............................................................................................................24
Draining the cooling circuit of the MSM+ HB............................................................................25
Sealing the cooling circuit of the MSM+ HB..............................................................................25
Sealing the aperture of the HB objective...................................................................................26
Packing the device...................................................................................................................26
27

Conditions at the installation site..............................................................................................27
Mounting position....................................................................................................................28
Aligning the MSM+ HB ............................................................................................................28
7.3.1
Important conditions for the position of the focused laser beam.................................28
7.3.2
Mounting the cyclone.................................................................................................29
7.3.3
Moving camera housing to axis center position .........................................................30
7.3.4
Positioning the pilot laser beam above the cyclone....................................................31
Mounting the Fibre Bridge (option)............................................................................................32

Connections

35

8.1
8.2
8.3
8.4
8.5
8.6
8.7
8.8
8.9

Overview of the connections....................................................................................................35
Power supply (24V)..................................................................................................................36
Ethernet (LAN)..........................................................................................................................36
Safety Circuit............................................................................................................................37
Safety Circuit PLM In (option)...................................................................................................38
Safety Circuit Fiber Out (option)................................................................................................38
Inlet external trigger (In)............................................................................................................38
Outlet internal trigger (Out).......................................................................................................38
Cooling water ..........................................................................................................................39
8.9.1
Connecting water supply ..........................................................................................39
8.9.2
Danger to the device .................................................................................................41
8.9.3
Parameters of cooling water connection....................................................................41
8.10 Compressed Air ......................................................................................................................43

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Measurement

44

9.1
9.2

Warning messages...................................................................................................................44
Preparing measurement...........................................................................................................45
9.2.1
Measurement process...............................................................................................45
9.2.2
MSM+ HB with Fiber Bridge (option)..........................................................................45
9.3 Connect / disconnect the device with the LaserDiagnosticsSoftware LDS................................47
9.3.1
Switch on the device and connect it to the LDS.........................................................47
9.3.2
If the device does not appear in the connections window..........................................49
9.3.3
Change the network address of a connected device..................................................49
9.3.4
Disconnect and switch off the device.........................................................................50
9.4 General procedure for measuring.............................................................................................51
9.4.1
Open the „Device control“ menu................................................................................51
9.4.2
Move camera housing to desired z-position...............................................................51
9.4.3
Open a measuring mode with adapted toolbench......................................................52
9.4.4
Configure and save measurement settings.................................................................53
9.4.5
Messages in the LaserDiagnosticsSoftware LDS during measurement.......................56
9.5 Single planes measurement.....................................................................................................57
9.5.1
Configure settings......................................................................................................57
9.5.2
Configure advanced settings......................................................................................60
9.5.3
Measure a plane........................................................................................................63
9.5.4
Measure further planes..............................................................................................65
9.6 Continuous plane measurement (Monitor)................................................................................66
9.6.1
Configure settings......................................................................................................66
9.6.2
Configure advanced settings......................................................................................69
9.6.3
Aligne the MSM+ HB with the Monitor measuring mode............................................70
9.6.4
Measure a plane continuously....................................................................................71
9.7 Manual caustic measurement...................................................................................................73
9.7.1
Configure settings......................................................................................................73
9.7.2
Configure advanced settings......................................................................................75
9.7.3
Measure a caustic manually.......................................................................................78
9.8 Automatic caustic measurement..............................................................................................79
9.8.1
Configure settings......................................................................................................79
9.8.2
Configure advanced settings......................................................................................80
9.8.3
Measure a caustic automatically................................................................................83
9.9 Beam pointing..........................................................................................................................84
9.9.1
Configure settings......................................................................................................85
9.9.2
Configure advanced settings......................................................................................86
9.9.3
Measure beam pointing stability.................................................................................87
9.10 Fiber mode measurement........................................................................................................88

10

Troubleshooting

89

10.1 Error during a measurement.....................................................................................................89
10.2 No measurement signal at the MSM+ HB................................................................................89
11

Maintenance and service
11.1
11.2
11.3
11.4

90

Maintenance intervals...............................................................................................................90
Cleaning the device surface.....................................................................................................90
Spare parts..............................................................................................................................90
Exchange wear parts...............................................................................................................90
11.4.1 Demount the measuring objective..............................................................................90
11.4.2 Exchange protective window in front of the power output aperture............................92
11.4.3 Exchange beam splitter.............................................................................................93
11.4.4 Change aperture at the beam entrance......................................................................94

12

Measures for the product disposal

94

13

Declaration of conformity

95

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14

Technical data

97

15

Dimensions

98

15.1
15.2
15.3
15.4
16

Dimensions of the MSM+ HB10...............................................................................................98
Dimensions of the MSM+ HB10 with fibre bridge...................................................................100
Dimensions of the MSM+ HB20 (at zmax).................................................................................103
Dimensions of the MSM+ HB20 with fibre bridge (at zmax).......................................................105

Appendix107

16.1 Appendix A: GNU GPL license notice.....................................................................................107
16.2 Appendix B: Using a PLM for power measurement................................................................107
16.2.1 Cooling water connection........................................................................................107
16.2.2 Electrical connections..............................................................................................108
16.2.3 Transport or storage of the PowerLossMonitor PLM................................................108
16.2.4 Measurement with PLM...........................................................................................109
16.3 Appendix C: Measuring pulsed irradiation .............................................................................110
16.3.1 Trigger operation......................................................................................................110
16.3.2 Measuring configuration selection............................................................................111
16.3.3 Influence of the pulse parameters on the integration time control.............................111
16.3.4 Examples for trigger operation.................................................................................115
16.3.5 Summary.................................................................................................................115

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35,0(6MSM+ HBPRIMES - The Company
PRIMES manufactures measuring devices used to analyze laser beams. These devices are employed forthe diagnostics of high-power lasers ranging from CO2 lasers and solid-state lasers to diode lasers. A wavelength range from infrared through to near UV is covered, offering a wide variety of measuring devices todetermine the following beam parameters:••••

Laser power
Beam dimensions and position of an unfocused beam
Beam dimensions and position of a focused beam
Beam quality factor M²

Development, production and calibration of the measuring devices is performed at PRIMES. This guarantees
optimum quality, excellent service, and a short reaction time, providing the basis for us to meet all of ourcustomers’ requirements quickly and reliably.

PRIMES GmbH
Max-Planck-Str. 264319 Pfungstadt
GermanyTel +49 6157 9878-0
info@primes.dewww.primes.de

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Basic safety notes

Intended use
The device has been designed exclusively for measurements in the beam of high-power lasers.
Use for any other purpose is considered as not intended and is strictly prohibited. Furthermore, intended use
requires that you observe all information, instructions, safety notes and warning messages in this operating
manual. The specifications given in chapter “14 Technical data” on page 97 apply. Any given limit values
must be complied with.
If not used as intended, the device or the system in which the device is installed can be damaged or destroyed. In addition, there is an increased risk to health and life. Only use the device in such a way that there isno risk of injury.
This operating manual is an integral part of the device and must be kept in the immediate vicinity of the placeof use, accessible to personnel at all times.
Every person who is responsible for the installation, start-up or operation of the device must have read andunderstood the operating manual and, in particular, the safety instructions.
If you still have questions after reading this operating manual, please contact PRIMES or your supplier foryour own safety.
Observing applicable safety regulations
Observe the safety-relevant laws, guidelines, standards and regulations in the current editions published by
the state, standardization organizations, professional associations, etc. In particular, observe the regulations
on laser safety and comply with their requirements.
Necessary safety measures
The device measures direct laser radiation, but does not emit any radiation itself. However, during the measurement the laser beam is directed at the device. This produces scattered or directed reflection of the laser
beam (laser class 4). The reflected beam is usually not visible.
Protect yourself from direct and reflected laser radiation while working with the device by taking the following
measures:
•
•

•
•
•
•
•
•

Never leave the device unattended when taking measurements.
If the device is moved from its aligned position, increased scattered or directed reflection of the laser
beam occurs during measuring operation. Fix the device in such a way that it cannot be moved by unintentional bumping or pulling on the cables.
Connect the laser control’s safety interlock to the device. Check that the safety interlock will switch off
the laser properly in case of error.
Install safety switches or emergency safety mechanisms that allow the laser to be switched off immediately.
Use suitable beam guidance and beam absorber elements which do not emit any hazardous substances
when irradiated.
Wear safety goggles adapted to the power, power density, laser wavelength and operating mode of thelaser beam source in use.
Wear suitable protective clothing or protective gloves if necessary.
If possible, also protect yourself from direct laser radiation and scattered radiation by using separating
protective devices that block or attenuate the radiation.

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Necessary safety measures due to magnetic spring with strong permanent magnet
The device contains a magnetic spring made of neodymium magnets with a very strong magnetic field.

DANGER
Danger to life for persons with pacemaker or implanted defibrillator
Magnetic spring rotors consist mainly of neodymium magnets (NdFeB magnets). These can
impair the correct functioning of pacemakers.
X If you have a cardiac pacemaker or implanted defibrillator, keep a minimum distance of 1 m
from the device.
•••

Do not bring magnetic parts near the measuring device. Careless handling can lead to serious injuries(bruises, broken fingers, etc.).
Please note that magnetic springs can act like tensioned springs. The sliders spring back to their original
position as soon as they are let loose, even if he machine is disconnected from the power supply.
Keep a safe distance to the magnetic spring with objects that can be damaged by magnetism. These
include, for example, televisions and monitors, credit cards, computers, data carriers, video tapes, mechanical watches, hearing aids and loudspeakers.

Employing qualified personnel
The device may only be operated by qualified personnel. The qualified personnel must have been instructedin the installation and operation of the device and must have a basic understanding of working with highpower lasers, beam guiding systems and focusing units.
Conversions and modifications
The device may not be modified in terms of design or safety without the explicit consent of the manufacturer.
The same applies to unauthorised opening, dismantling and repair. The removal of covers is only permitted
within the scope of the intended use.
Liability disclaimer
Manufacturer and distributor exclude any liability for damages and injuries which are direct or indirect consequences of using the device not as intended or modifying the device or the associated software withoutauthorization.

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Symbols and conventions

Warning messages
The following symbols and signal words indicate possible residual risks in the form of warnings:

DANGER
Means that death or serious physical injuries will occur if necessary safety precautions are nottaken.

WARNING
Means that death or serious physical injuries may occur if necessary safety precautions are nottaken.

CAUTION
Means that minor physical injury may occur if necessary safety precautions are not taken.

NOTICE
Means that property damage may occur if necessary safety precautions are not taken.

Product safety labels
The following symbols are used on the device itself to indicate imperatives and possible dangers:

No access for people with pacemakers or implanted defibrillators

General warning sign

Hand injuries warning

Magnetic field warning

Read and observe the operating instructions and safety guidelines before startup!

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Do not lift the device by the objective

Labeling according to WEEE directive:
The device must not be disposed of with household waste, but in a separate WEEE collection
in an environmentally friendly way.
Further symbols and conventions in this operating manual
Here you can find useful information and helpful tips.

Indicates a simple instruction.
If several such instructions appear one below the other, then the order of their execution is irrelevant or they are alternative procedures.

1.
2.
...

A numbered list identifies a sequence of instructions that must be executed in the specified order.

Indicates the result of an action to explain processes that take place in the background.
Indicates an observation prompt to draw attention to visible feedback from the device or the software.
Observation prompts make it easier to check whether an instruction was executed successfully.
Often they also guide to the next instruction.
Points to a control element that is to be pressed / clicked.
Points to an element described in the text (for example an input field).

3

About this operating manualThis manual describes the installation and operation of the MSM+ HB and how to perform measurementswith the LaserDiagnosticsSoftware LDS 1.1.2.
For measurement operation with a PC, the LaserDiagnosticsSoftware LDS must be installed on the PC. The
LDS is included in the scope of delivery.
The software description includes a brief introduction on using the device for measurements.
For a detailed description of the software installation, file management and evaluation of the measurement
data, please refer to the separate instructions for the LaserDiagnosticsSoftware LDS.
This operating manual describes the software version valid at the time of printing. Since the operating software is subject to continuous further development, it is possible that the the supplied datacarrier may contain a higher version.
If you have any questions, please let us know the software version you are using. The software version canbe found under the following menu item: Help > About LaserDiagnosticsSoftware.

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Device description

4.1

Device types

There are two types of MSM+ HighBrilliance:••

MSM+ HB10
MSM+ HB20

Fig. 4.1:

MSM+ HB10

Fig. 4.2:

MSM+ HB20

The main distinguishing feature between the two devices is the absorber, which is dimensioned for different
beam powers. The MSM+ HB10 is designed for a maximum beam power of 10 kW. The MSM+ HB20 isdesigned for a maximum power of 20 kW and is therefore equipped with a larger absorber.
Due to the special absorber design of the MSM + HB20, the possible maximum travel in z-direction is limited: it is 120 mm for the 10 kW type and 40 mm for the 20 kW type (not with the fiber bridge installed!).
The x- and y-axes of the 20 kW type are fixed. The device cannot be moved in x- or y-direction.

4.2

Functional description

The MSM+ HB is used to analyze the focused laser beam in the range from 20 μm to 1000 μm. For thispurpose, the device records the power density distribution in the area around the focus in form of a caustic.
A caustic comprises several measurement planes (according to ISO 11146-1 at least 10). A measurement
plane maps the true power density distribution at an associated z coordinate along the optical axis of thelaser beam.

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35,0(6MSM+ HBThe beam geometries (beam position, beam radius and azimuth angle) are determined for each plane according to the procedures described in the standard ISO 11146 (2. moment and 86 % power inclusion).
The beam propagation parameters (focus position, focus radius, Rayleigh length, divergence, M2, K andbeam parameter product) are determined with the beam geometry data. From the measurement data for thesemi-axes of the beam, the ellipticity of the focus and the astigmatic difference are determined according toISO11146.
An automatic function supports the user when measuring a caustic.
Device Assembly
Beam entrance
High Brilliancemeasuring objective

Z-axis-drive
Z-axis-drive

HighPower
beam absorberFig. 4.3:

Components of the MSM+ HB

Lever to adjust the magnification

Lever to adjust themagnification

Magnification objective (high)Standard
Alignment objective (low)Fig. 4.4:

14

Levers to adjust the magnification

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There are two levers on the side of the device for adjusting the magnification. With these two levers, either amagnification objective or an adjustment lens can be inserted into the beam path.
The magnification objective can be inserted on the image side by moving both levers to the upper position.
The alignment objective can be inserted into the beam path by moving both levers to the lower position.
The alignment objective simplifys the beam search, since the measuring range (in x, y) is increased. For themeasurement, the best suited objective should be chosen.

4.3

Measuring principle

There are several beam splitters integrated in the measuring objective so that 99.9 % of the laser power isguided to appropriately dimensioned absorbers. The laser beam is attenuated by further optical elements inthe device until it can be guided to a CCD sensor.

Laser beam

Upper limit
Measuring plane

Lower limit
Measuring objective

AbsorberPrismsFixed filter

Mirrors

Alignment objectiv (AO)
CCD-sensor

AbsorberMagnification objective (MO)

Trigger diode
Filter wheel

Fig. 4.5:

Schematic illustration of the optomechanical design

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4.4

Measurement Range of the MSM+ HB

4.4.1

Measurement Range of the MSM+ HB10

MSM+ HB

For a measurement, the divergence should be at least 20 mrad (full angle).
Tab. 4.1 shows the correlation between power, diffraction index M² and the focus radius.

Tab. 4.1:

16

Maximum power in kW as a function of the diffraction index M² and the focus radius

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4.4.2

Measurement Range of the MSM+ HB20

outside specification

valid measurement range

Fig. 4.6:

Maximum power as a function of the laser divergence angle

outside specification

valid measurement range

Fig. 4.7:

Maximum power as a function of the laser divergence angle (excerpt)

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MSM+ HB

Optical displays

The various measuring states are indicated by different colors and light signals within the status display.
Status display

Tab. 4.2:

Status display

Color

Meaning

White

The device is switched on and is operational.

Yellow

A measurement is running.

Red

Lights up briefly: a measuring plane is being recorded.
Staying lit: a device error has occurred. The device error is shown in the LaserDiagnosticsSoftware
LDS.

Tab. 4.3:

18

Description of the colors and light states of the status display

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4.6

Fig. 4.8:

Explanation of the product safety labels

Position of the product safety label I

There is a magnetic spring in the MSM+ HB which counteracts the weight of the measuring objective andthus relieves the traverse motors of the z-axis.
The device contains a magnetic spring made of neodymium magnets (NdFeB magnets) with a very strong
magnetic field
No access for people with pacemakers or implanted defibrillators
A possible hazard area for persons with pacemakers or implanted defibrillators is marked with asymbol on the device.
The magnetic spring may affect the correct functioning of pacemakers or implanted defibrillators. If you have a pacemaker or implanted defibrillator, keep a minimum distance of 1 m fromthe device.
Hand injuries warning due to magnetic spring
A possible hazard area for hand injuries is marked with a symbol on the device.
Note that magnetic springs can behave like tensioned springs. The sliders snap into their rest
position as soon as they are released, even if, for example, the machine is disconnected fromthe power supply. Do not bring any magnetic parts near the measuring device. Careless handling can result in serious injuries (crushing, broken fingers, etc. ).
Magnetic field warning
A possible hazard area, originating from a magnetic field, is marked with a symbol on the device.
Keep a safe distance from the magnetic spring with objects that can be damaged by magnetism. These include, for example, televisions and monitors, credit cards, computers, datacarriers, video tapes, mechanical watches, hearing aids and loudspeakers.

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Hand injuries warning due to movement of camera housing
Another possible hazard area for hand injuries is marked with a symbol on the device.
The camera housing of the device can be moved along the z axis. Do not reach into the operating range of the camera housing. Careless handling may result in crushing.

Fig. 4.9:

Position of the product safety label II

Do not lift the device by the objective
A possible hazard area for damage to the device due to incorrect lifting is marked with a symbolon the device.
Do not lift or transport the device by the objective.

Fig. 4.10:

Position of the product safety label III

General warning sign (Option, devices with fiber bridge only)
A possible hazard area for device damage is marked with a symbol on the fiber adapter.
Depending on the type of fiber adapter, a collision may occur at this point when moving thedevice along the z axis.

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Scope of delivery and accessories

The scope of delivery of the MSM+ HB includes:
•
•
•
•
•
•
•
•
•
•

USB stick with, USB-driver, LaserDiagnosticSoftware LDS, PDF operating manual
Operating manual
Power supply unit
Power cable
Cable patch Cat. 5eInterlock cablesealing plugs for water connections (mounted)
Transport lock (mounted)
Inlet and outlet aperture covers (mounted)
Cyclone with alignment tool

For the MSM+ HB the following accessories are available:•••

Safety, transport and storage case
Fiber bridge
Fiber adapter: LLK-D, HLC16, QBH

For the measurement of fiber lasers, a fiber bridge with fiber adapter can be mounted optionally on the
MSM+ HB.
Another option is to measure the laser power with a PowerLossMonitor PLM (additional device).
See chapter “16.2 Appendix B: Using a PLM for power measurement” on page 107.
The accessories are provided with the appropriate connection cables and hoses.

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MSM+ HB

Quick overview installation

This quick overview informs you in advance about necessary protective measures, mediums necessary for
operation and required connecting elements.
1.

Take safety precautions

Chapter 1 on page 9

DANGER
Danger to life for persons with pacemaker or implanted defibrillator
Magnetic spring rotors consist mainly of neodymium magnets (NdFeB magnets). These
can impair the correct functioning of pacemakers.
X If you have a cardiac pacemaker or implanted defibrillator, keep a minimum distance of
1 m from the device.
2.

Aligne the device to the laser beam and mount stable•

An alignment tool is included in the scope of delivery•

You need 6 screws M8x1 and 2 screws for the mounting holes Ø 6.6 mm

3.

Install the water-cooling•

Connection diameter 12 mm (16 mm for 20 kW-model)•

Flow rate 7 l/min - 8 l/min (14 l/min - 16 l/min for 20 kW-model)

4.

Connect the compressed air•Compressed air according to ISO 8573-1:2010 [6:4:4].

•

0.5 bar - 1 bar•

Connection diameter 6 mm

5.

Disassemble the inlet aperture cover

Chapter 6 on page 23

6.

Electrical connection

Chapter 8.2 on page 36•

Establish voltage supply•

External safety switch (interlock)7.

Connect with the PC•

Connection via Ethernet

8.

Install the LaserDiagnosticsSoftware LDS on the PC•

Software is part of the scope of delivery

22

Chapter 7 on page 27

Chapter 8.9 on page 39

Chapter 8.10 on page 43

Chapter 8.3 on page 36

Chapter 9 on page 44

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6

Transport and storage

6.1

Warning messages

35,0(6WARNING
Risk of injury when lifting the device
Lifting and positioning heavy devices can, for example, stress intervertebral disks and cause
chronic changes to the lumbar or cervical spine.
X Use a lifting device to lift and position the device.
X Without a lifting device, several people must lift and position the device.

NOTICE
Damaging / destroying the device due to improper handlingContamination can damage or destroy the optical components. Components may be damaged if the device is subjected to hard shocks or is allowed to fall.
X Move the camera housing to home position before transporting / storing the device.
X The device must only be transported / stored with a mounted lock.
X Handle the device with care when transporting it.
X To avoid contamination, close the measuring objective with the supplied cover before transporting / storing the device.
X If possible, transport / store the device in the original PRIMES transport case (optional).
The device only fits into the original PRIMES transport case (optional) when the camera housing is
in home position.

NOTICE
Damaging / destroying the device due to leaking or freezing cooling water
The device can be damaged by leaking cooling water.
Even if the pipe system of the cooling circuit has been drained, a small amount of water
always remains in the device. This can leak out and enter the interior of the device.
X Drain the pipe system of the cooling circuit thoroughly before transporting / storing the device. You can use compressed air for draining.
Attention: Do not use compressed air to drain the PowerLossMonitor PLM cooling circuit.
X Before transporting / storing the device, close the water connections of the cooling circuitwith the sealing plugs provided.

NOTICE
Damaging / destroying the device due to incorrect storage conditions
Incorrect storage conditions can damage / destroy the device.
X Only store the device within the permissible environmental conditions specified in chapter“14 Technical data” on page 97.

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MSM+ HB

Removing transport lock

After unpacking the device, the transport lock has to be removed first. The transport lock secures the linear
carrier of the z-axis. It is located on the base plate and is fastened with three screws (see Fig. 6.1 on page24).

Fig. 6.1:

Position of the transport lock at MSM+ HB10

The transport lock of the MSM+ HB20 is longer than the one shown here.
Keep this transport lock in a safe place, as it should be reassembled before each transport of the device.

6.3

Installing transport lock

Install the transport lock before storing or transporting the device. The transport lock secures the camera
cassette to the base plate of the device and prevents misalignment of the axes due to mechanical influences.
The misalignment of the camera housing has a direct influence on the adjustment of the fiber bridge.
X Installing the transport lock
1. Disconnect the device from the LaserDiagnostics software LDS and switch it off as describedin chapter 9.3 on page 47. Make sure thatthe camera housing is in the zero position before switching off.
2. Install the transport lock with three M4x10
cylinder head screws. (The transport lock of the
MSM+ HB20 is longer than shown here.)Transport lock24

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6.4

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Draining the cooling circuit of the MSM+ HB

The cooling circuit of the MSM+ HB must be completely drained. Storage or transport at a temperature thatis close to or below freezing point can lead to damages due to the formation of ice, if the cooling circuit is notcompletely empty.
X Drain the cooling circuit completely.
You may use compressed air to purge the cooling
circuit of the MSM+ HB.

Cooling circuit connectors

The photo shows the situation at the MSM+ HB10

6.5

Sealing the cooling circuit of the MSM+ HB

Even if the cooling circuit has been drained completely, a small amount of residual water remains inside thedevice. This may leak during transport and damage the electronics of the device.
X Seal the connecting plugs of the cooling circuitby using of the enclosed plugs.
1

A total of 4 plugs with 12 mm outer diameter isrequired for the MSM+ HB10.

2

A total of 2 plugs with 16 mm is required for the
MSM+ HB20

3

4

The photos show the situation at the MSM+ HB10

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MSM+ HB

Sealing the aperture of the HB objective

The magnetically held alignment tool may fall off during shipping. This can lead to contaminations within
the objective. The objective of the MSM+ HB must therefore be sealed for shipping with the enclosed black
aperture lock.
1. Turn on the compressed air.
2. Remove the alignment tool.

Aperture lock3. Disassemble the cyclone.

Sealing ing

4. Install the aperture lock and the sealing ring with
4 cylinder head bolts M3x8.
5. Turn off the compressed air.

6.7

Packing the device

1. Pack the device completely in a plastic wrap to avoid contamination with particles from the case paddingfoam.
2. Place the packaged unit in the PRIMES transport case and close the cover with all tension locks. All accessories must be completely enclosed.
The fiber bridge belonging to the device (option) must be enclosed with each service shipment. Else a
correct alignment of the bridge to the device cannot be guaranteed performing mechanical work on the
MSM+ HB.
1. Uninstall the fiber bridge.

Fiber bridge

2. Pack the fiber bridge separately.

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735,0(6

Mounting

DANGER
Danger to life for persons with pacemaker or implanted defibrillator
Magnetic spring rotors consist mainly of neodymium magnets (NdFeB magnets). These can
impair the correct functioning of pacemakers.
X DO NOT install the device if you have a cardiac pacemaker or implanted defibrillator. Keep aminimum distance of 1 m from the device.

DANGER
Serious eye or skin injury due to scattered radiation
X The numerical aperture (NA) of the laser beam has to be smaller than 0.11 in order to ensurethat no scattered radiation occurs on the corner of the objective.
X Wear safety goggles which are adapted to the used laser wavelength.
X When mounting the device, please ensure that it cannot be moved by unintentional pushes
or pulling the cables or hoses.
X Shield the device from scattered radiation.

WARNING
Danger of injuries due to a strong magnetic attraction
The magnet spring sliders can exert considerable forces as soon as they are close enoughto other sliders or iron. If they are not handled with the utmost care, this can lead to serious
injuries (contusions, broken fingers, etc.).
X The magnet spring must only be mounted or demounted by trained personnel. Handle themagnet spring with the utmost care when modifying the objective.

NOTICE
Danger of damage due to a strong magnetic field of magnet spring.
Magnet spring sliders mainly consist of very strong magnets.
X Keep a safety distance to all devices and parts which could be damaged by magnetism, e.g.
TVs and screens, credit cards, computers, data mediums, video tapes, mechanical clocks,
hearing aids and loud speakers.

7.1
•
•
•
•

Conditions at the installation site
The device must not be operated in a condensing atmosphere.
The ambient air must be free of organic gases.
Protect the device from splashes of water and dust.
Operate the device in closed rooms only.

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MSM+ HB

Mounting position

The MSM+ HB is designed to operate in a horizontal position with a beam incidence from above.
Check the space conditions before mounting. Especially check the required space for the connecting cables
and the traverse range of the z-axis (see chapter 15, „Dimensions“, on page 98). The device must be set
up in a stable manner and fastened with screws (see chapter 7.3 on page 28).

NOTICE
Damaging/destroying the device
The camera housing of the device can be moved along the z-axis. Obstacles in the traverse
range of the MSM+ HB can lead to collisions and damage the device.
X Keep the traverse range free of obstacles (cutting nozzle, pressure rolls, etc.).

7.3

Aligning the MSM+ HB

7.3.1

Important conditions for the position of the focused laser beam

Due to the imaging characteristics of the measuring objective it is necessary for the laser beam focus to bepositioned in a certain range above the measuring objective.

NOTICE
Damaging/destroying the device
The focus has to be in a defined range with reference to the measuring objective. In case it
is too close or too distant, the optics might get damaged in case of high beam intensities.
X Use the enclosed alignment tool for the alignment.
The size of the range in which the focus is to be positioned before the first measurement depends on thedivergence of the focused laser beam and the power used. The z-measurement range is between an upper
and a lower limit.
Upper limit
If the focus is too far above the measuring objective, a focus can occur on the image-side beam path.
Together with high beam intensities, this can cause damage to the optics. In addition, the aperture of theobjective can get damaged due to absorbed laser light.
Measuring plane
The power density distribution of the measuring plane is imaged on the CCD sensor.
Lower limit
If the focus is too close to the measuring objective, the beam splitter may be damaged, depending on thetype of focusing and the power used.
Measuring plane distance
The measuring plane distance corresponds to the distance of the measuring plane from the upper edge ofthe objective.
With the included alignment aid and a pilot laser beam, you can position the measuring device with the necessary accuracy.

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35,0(6MSM+ HBz-axisLaser Beam

Upper limit
Measuring plane

Permissible zmeasurement range

Lower limit
y-axisMeasuring plane distance
Measuring objective
x-axisBeam hits measuring objective
centered and perpendicularFig. 7.1:

7.3.2

z-measurement range of the MSM+ HB

Mounting the cyclone

4 screws a.f. 2.5 mm

Cyclone andalignment toolFig. 7.2:

Position of cyclone and alignment tool

The magnetically held alignment tool can fall down during shipping. Dirt may enter the objective. Therefore,
the objective of the MSM+ HB is closed with a black aperture lock.
You must remove the aperture lock on the objective first, then you can mount the cyclone.
Before removing the aperture lock, the area around the aperture must be cleaned with clean compressed air
and the purge air must be connected to the MSM+ HB.

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If the purge air is not connected, dust can enter the objective directly when the cyclone is mounted.
1. Turn on the purge air (see chapter 8.10 on page 43)
2. Remove the aperture lock by loosening the four screws.

Aperture lock
Sealing ring

Fig. 7.3:

Aperture lock at the beam entrance

3. Store the aperture lock and the O-ring in a clean, sealable plastic bag. If you store or transport the device, you should remount the aperture lock.
4. Fasten the cyclone to the objevtive with the four screws.
5. Cover the cyclone with the alignment tool.
7.3.3

Moving camera housing to axis center position

X Before aligning and mounting the device, check the approximate z-position of the camera housing.
If the camera housing is in home position, it cannot be moved further down on the z‑axis during
measurement. We recommend moving the camera housing to the center position of the z‑axis before alignment. If a caustic measurement is to be performed, the same amount of travel is available on both sides ofthe expected beam focus.

CAUTION
Crushing hazard
The camera housing of the device can be moved along the z-axis.
X Never reach into the traversing range of the camera housing.

NOTICE
Damaging / destroying the device
The camera housing of the device can be moved along the z-axis. Obstacles in the traversing range of the device can lead to collisions and damage the device.
X Always keep the traversing range of the camera housing free of obstacles.
Proceed as follows to move the camera housing to the axis center position:
1. Establish the electrical connections according to chapter 8 on page 35.
2. Switch on the device and connect it to the LaserDiagnosticsSoftware LDS according to chapter 9.3 on
page 47.
3. Open the Device control menu according to chapter 9.4.1 on page 51.
4. Move the camera housing to the axis center position according to chapter 9.4.2 on page 51.

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7.3.4

Positioning the pilot laser beam above the cyclone
Laser Beam

Alignment toolFig. 7.4:

Alignment tool for MSM+ HB

Due to the imaging features of the measuring objective, it is necessary to position the laser beam focus in acertain area above the cyclone. The device must be aligned to the laser beam along the z-axis as well as on
the x-y plane.
The measuring objective is imaging a measuring plane onto the CCD sensor. The measuring plane is outside
the measuring device. The beam must be aligned along the z-axis (centrically and perpendicular) into themeasuring plane.
Ideally, the beam focus should be exactly on the measuring plane after alignment. In practice, it is sufficientif the beam focus is within the limits of a permissible z measuring range. Otherwise, the measuring objective
can be damaged if the beam intensities are too high.
The measuring plane distance depends on the beam path (standard, magnification objective MO, alignment
objective AO) (see Tab. 7.1 on page 31).
Wavelength
in nm

Measuring Objective

MOB MSM+ HB
Tab. 7.1:

1064

Length of alignment tool
in mm

32,8

Measuring plane distancein mmStandard

MO

AO

32,8

32,8

32,3

Measuring plane distances
Lower reference plane

Fig. 7.5:

Lower reference plane

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1. Put the alignment tool on the cyclone. The upper surface corresponds to the z-position of the measuring
plane of the objective. The distance between lower reference plane and upper surface of alignment toolis z.
2. Turn on the pilot laser. If the laser hits the small hole in the alignment tool vertically, it is displayed centrally
on the sensor. Typically, the misalignment angle between the beam and the instrument axis should notexceed a divergence of 10 mrad (0.5°).
3. If the laser beam does not hit the small hole vertically, you can align the MSM+ HB with the 6 screws in
the threaded holes.
4. Finally, fasten the device, so that it cannot be moved by accidental bumping or pulling on the cables.

Fig. 7.6:

Fastening bores MSM+ HB, view from above

2 mounting holes Ø 6,6 mm
6 thread holes M8x1 for the alignment

7.4

Mounting the Fibre Bridge (option)

To fix fibres - for example when using fibre lasers - a fibre bridge with fibre adapter can be mounted.

NOTICE
Damaging/destroying the fiber
In the upper z-axis position the device can collide with the plugged fiber and damage it
X Note the maximum travel range (chap. “14 Technical data” on page 97)
X Dismount the cyclone before the startup!

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4 Screws a.f. 2.5 mm

Cyclone andalignment tool

1. Disassemble the cyclone.
2. Mount the fiber adapter on the fiber bridge.
To do this, attach the fiber adapter to the fiber
bridge with two screws. Do not fully tighten thescrews yet.
Holes for
Mounting screws
Fiber bridge

3.
Fiber adapter

The position of the fiber adapter is fixed with theadapter stop. Press the fiber adapter against theadapter stop and tighten the screws.

Fiber holder
Adapter stop

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4. Insert the enclosed dowel pins on both sides
into the hole provided.

Hole for dowel pins

5. Disassemble the two grab handles on the
MSM+ HB. To do this, loosen the visible screws
in the grab handle.

Grab handle

Fiber bridge

Dowel pin

34

Grab handle

6. Put the fiber bridge on the MSM+ HB.

7. Fasten the fiber bridge by means of two screws(M5 x 10 mm) on both sides. Please note that
longer screws (>10 mm) can block the Z-axis
underneath.

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8

Connections

Only the supplied PRIMES power supply unit and the supplied connection cables and hoses may be used toestablish the connections.

8.1

Overview of the connections

Safety interlock connection for fiber bridge

Safety interlock connection for PLM

Safety interlock connection for laser system

On/off switch

Input
external trigger

Power supply
Fig. 8.1:

LAN-port

Outputinternal trigger

Electrical connections at the device

Both a cooling water supply and a compressed air supply are required to operate the MSM+ HB.
The device is equipped with a HighBrilliance measuring objective, which has to be cooled with water andflushed with compressed air. The required hoses are already preassembled.

Compressed airconnection(front side)

Cooling circuit returnFig. 8.2:

Cooling circuit inlet

Water and compressed air connections at the MSM+ HB20

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MSM+ HBPower supply (24V)

The device requires a supply voltage of 24 V ± 5% (DC) for operation. A suitable power supply unit with cable
is included.
The connection socket for power supply is a 5-pin, L-coded M12 connector.
Harting M12-P-PCB-THR-2PC-5P-LCOD-M-STR
3

2

4

1
FE

Tab. 8.1:

8.3

Pole

Function

1

+24 V

2

Not connected

3

GND

4

Not connected5

FE (functional earth)

Connection socket for the power supply

Ethernet (LAN)NOTICE
Damage / destruction of the device due to voltage peaks
Disconnecting the connecting cables during operation causes voltage peaks. This could
destroy the communication modules of the device.
X Connect / disconnect all plugs only when the power is off.
1. Connect the device with the PC or with the network.
2. Plug the power supply into the connector socket for the power supply.
PRIMES Power Supply

orFig. 8.3:

36

Ethernet

Ethernet

PC

LAN

Connection via Ethernet with a PC or a local network

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8.4

Safety Circuit

Connect this port to your laser system (Safety PLC or Emergency off).
The Safety Interlock protects the MSM+ HB from damage by switching off the laser in the following cases:•••

The voltage supply at the MSM+ HB is not connected or interrupted
There is an overtemperature at the absorber
A referencing procedure is triggered during the measurement

DANGER
Fire hazard; Damage / Destruction of the device
If the safety circuit is not connected, the operating conditions of the device are not monitored.
X Connect the safety interlock of the laser control in such a way that the laser is switched off
in the event of a fault.
X Check that the safety interlock will switch off the laser properly in case of error.
The interlock connection provides two redundant safety circuits.

NOTICE
Damage/destruction of the device due to overvoltage.
The MSM+ HB provides + 24 V via pin 7 and 8. If 24 V are applied externally, the device may
be damaged.
X Do not apply any external voltage to pin 7 and 8.
M8 connector 8-pin (Pin: view connector on device; Color: color of cable core)

2

1
8

3
4

7
6

5

Pin

Color

Function

1

White

COM 1:

2

Brown

NoClosed 1: Connected with pin 1 when not ready for operation

3

Green

NoOpen 1: Connected with pin 1 when ready for operation

4

Yellow

COM 2:

5

Grey

NoClosed 2: Connected with pin 4 when not ready for operation

6

Pink

NoOpen 2: Connected with pin 4 when ready for operation

7

Blue

Connection for switch or bridge

8

Red+ 24 V applied by the device, connection for switch or bridge

Connected with pin 2 when not ready for operation
Connected with pin 3 when ready for operation

Connected with pin 5 when not ready for operation
Connected with pin 6 when ready for operation

Matching ready-made cable: Binder 79-3808-52-08
Tab. 8.2:

Pin assignment of the safety interlock connector

If the safety interlock is triggered, pin 1 and pin 2 (pin 4 and pin 5) are connected. If the values correspond tothe operating conditions, pin 1 and pin 3 (pin 4 and pin 6) are connected.
Pin 7 must be connected to pin 8 via an external switch or a bridge.

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MSM+ HB

Safety Circuit PLM In (option)

This connection is only used if you are using a PowerLossMonitor PLM for power measurement.

NOTICE
Danger of damage due to overheating
If the safety circuit is not connected, the device can be damaged due to overheating.
X Connect the Safety Interlock of the PowerLossMonitor PLM to the MSM+ HB.
X Check that the laser is switched off properly by the external safety circuit in the event of a
fault.
The Safety Interlock protects from damage by switching off the laser in the following cases:• The water flow is too low.
Make sure that the Safety Interlock MSM connector on the PowerLossMonitor PLM is connected to the
Safety Circuit PLM-In connector on the MSM+ HB. Use the enclosed 8-pin cable, which is pre-assembled
on both sides.
The interlock connection provides two redundant safety circuits.

8.6

Safety Circuit Fiber Out (option)

This connection is only used if you are using a fiber bridge to connect a laser.
The Safety Interlock protects against damage by switching off the laser in the following cases:• The fiber is not mounted correctly.
Make sure that the safety interlock connection on the fiber holder is connected to the Safety Circuit Fiber Out
connector at the MSM+ HB. Use the enclosed 3-pin cable.

8.7

Inlet external trigger (In)BNC connector (view: connector side)1
2

Tab. 8.3:

8.8

Pin

Function

1+5 V (Trigger signal)

2

GND

Connection socket inlet for an external trigger in the connection panel

Outlet internal trigger (Out)BNC connector (view: connector side)1
2

Tab. 8.4:

38

Pin

Function

1+5 V (Trigger signal)

2

GND

Connection socket outlet for the internal trigger in the connection panel

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8.9

Cooling water

NOTICE
Fire hazard; Damage/Destruction of the device due to overheating
If there is no water cooling or a water flow rate which is insufficient, there is a danger ofoverheating, which can damage the device or set it on fire.
X Only operate the device with a connected water cooling and a sufficient water flow rate.
The connections at the MSM+ HB are intended for PE-hoses with a diameter of 12 mm (respectively 16 mm
at MSM+ HB 20 kW). Connect the cooling circuit (inlet and return flow) to the water supply and check if thehose connections are tight.
If you use a PowerLossMonitor PLM start the cooling approx. 2 minutes before the start of the measurement
and stop it approx. 1 minute after the end of the measurement. Only cool the device during measurement,
the number of operating hours influences the service life of the turbine in the PowerLossMonitor PLM.
8.9.1

Connecting water supply

The plug-in connectors are sealed with plugs on delivery so that no residual water can leak out. Remove thesealing plugs and keep them for later transport or shipment.
1. Push down the release ring of the connection and pullout the plug with your free hand.

Release ring

2. Remove the sealing plugs of the water connections
1. Push3. Keep them in a save place.
2. PullFig. 8.4:

Remove the sealing plugs of the water connections

4. Connect the flow line (Water In) and the return line (Water Out) of the device, by inserting the hose as far
as possible (approx. 20 mm deep).
5. Check whether the hose connections are tight.

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Connecting cooling circuit at MSM+ HB10
For packaging reasons the cooling water pipe of the absorber has been removed. The cooling water pipe
has to be reconnected with the absorber.
X Remove the sealing plug from both the water
pipe and the absorber.

X Insert the adapter into the connector of the water
pipe.

Adapter

X Insert the adapter into the absorber.

X

Connect cooling circuit.

You can use compressed air to drain the cooling
circuit of the MSM+ HB.
Water out

Fig. 8.5:

40

Water in

Cooling circuit connection at MSM+ HB10

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Connecting cooling circuit at MSM+ HB20
There is no adapter required for the MSM+ HB20.
X Connect the cooling water directly to the device.

Water out
Water in

8.9.2

Danger to the device

NOTICE
Damage/Destruction of the device
If the following requirements for the cooling circuit are not observed, the measuring device
may be damaged.
X Observe the following requirements.
Water quality
The device can be operated with tap water as well as demineralized water.
An operation with strongly deionized water (DI-water, conductivity < 30 µS/cm) is only possible with the respective connection parts (stainless steel) – we would be glad to advise you if necessary.
Large dirt particles or teflon tape may block internal cooling circuits. Therefore, please thoroughly rinse thesystem before connecting it.
Aluminum components
Do not operate the device on a cooling circuit in which aluminum components are installed. Otherwise, corrosion in the cooling circuit can occur, particularly when operating at high powers and power densities. In thelong term, this will reduce the efficiency of the cooling circuit.
8.9.3

Parameters of cooling water connection

Data

MSM+ HB10

MSM+ HB20

PE hose diameter

12 mm

16 mm

Recommended flow rate

7 - 8 l/min

14 - 16 l/min

Minimum flow rate

5 l/min10 l/minRecommended water pressure

2 bar

2 bar

Maximum water pressure

4 bar

4 bar

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Condensates within the device
The device must not be operated in a condensing atmosphere. The humidity has to be considered in orderto prevent condensates within and outside the device.

40

100

35

80
70
60

30

50
25

40

20

30

15

20

Relative humidity in %Cooling water temperature in °C

The temperature of the cooling water must not be lower than the dew point.

10
5
10

0
0

Tab. 8.5:

5

10

15
20
25
30
Air temperature in °C

35

40

Dew point Diagram

ExampleAir temperature:		Relative humidity:

22 °C
60 %

The cooling water temperature must not fall below 14 °C.
Flow rate
The value for the flow rate should not be below 0.7 l/min per kW laser power.
The following rule of thumb can be used to determine the flow rate - depending on the laser power used:
For each kW of laser power, a flow rate of approx. 1 l/min of cooling water is required.
Example: With a laser power of 7 kW, this corresponds to a flow rate of 7 l/min.

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8.10

Compressed Air

The compressed air is required in order to generate an air flow in the cyclone which is directed outwards.
This is supposed to prevent the penetration of dirt particles.

NOTICE
Damage to the optical components
Contaminated compressed air can permanently damage the optical components of the measuring device.
X The compressed air must be according to specification ISO 8573-1: 2010 [6: 4: 4].
Connect the compressed air supply by means of a plastic hose.
Data

Value

Hose diameter

6 mm

Typical air pressure

0.5 - 1.0 bar

Maximum permissible air pressure

2 barSpecification according toISO 8573-1: 2010 [6: 4: 4].

The compressed air connector is located opposite the connection side of the device.

Compressed air
supply ∅ 6 mm
Fig. 8.6:

Compressed air supply

CAUTION
Hearing damage
If the compressed air hose is loosened when pressure is still applied to the hose, this generates noise. This can cause hearing damage.
X Only loosen the compressed air hose when there is no longer any pressure.
Connecting the compressed air hose
X Push the hose into the plug-in connection as far as it will go.
Disconnecting the compressed air hose (Only when the measuring objective is closed)
X Press down the blue release ring of the connector with one hand and pull out the hose with the other
hand.

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MSM+ HB

Measurement

This chapter describes measurements with the LaserDiagnosticsSoftware LDS. For a detailed description of
the software installation, file management and evaluation of the measured data, refer to the separate operating manual LaserDiagnosticsSoftware LDS.

9.1

Warning messages

DANGER
Serious eye or skin injury due to laser radiation
During the measurement the laser beam is directed at the device. This produces scatteredor directed reflection of the laser beam (laser class 4). The reflected beam is usually not
visible.
X Wear safety goggles adapted to the power, power density, laser wavelength and operating
mode of the laser beam source in use.
X Wear suitable protective clothing or protective gloves if necessary.
X Protect yourself against laser radiation by means of separating devices (e.g. suitable shielding walls).

CAUTION
Crushing hazard
The camera housing of the device can be moved along the z-axis.
X Never reach into the traversing range of the camera housing.

NOTICE
Damaging / destroying the device
Obstacles in the traversing range of the device can lead to collisions and damage the device.
X Always keep the traversing range of the device free of obstacles (cutting nozzles, pressurerollers, etc.).

NOTICE
Damaging / destroying the device
Contamination and fingerprints on the protective window can lead to damage or shatteringor splintering of the protective window during measurement.
X Do not touch the protective window.
X Regularly check the condition of the protective window and exchange it in case of pollution(see chapter 11.4, „Exchange wear parts“, on page 90).
X Only operate the device with a clean protective window.

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9.2

Preparing measurement

9.2.1

Measurement process35,0(6The described measurement process is an example. Adapt the procedure to the conditions on site.
1. Follow the basic safety notes and the warning messages.
2. Observe the technical data in Chapter (“14 Technical data” on page 97
3. Make sure that the cyclone is mounted and covered with the alignment tool.
4. Make sure that the connections of the water cooling are firmly mounted and tight.
5. Turn on the water-cooling.
6. Turn on the measuring device.
7. Wait until the measuring device has finished the referencing procedure (duration approx. 30 seconds).
8. Start the LaserDiagnosticsSoftware LDS on your computer.
9. Change the z-position to 60 mm (center of the measuring range; 20 mm for MSM+ HB20).
10. Open the compressed air supply.
11. Turn on the pilot laser. The laser must hit the small hole in the alignment tool vertically, only then it is displayed centrally on the sensor.
12. Remove the alignment tool.
13. At the beginning measure the laser at low power and define the measuring range for the caustic measurement. The measuring range typically comprises 2 to 3 Rayleigh lengths above and below the focusplane.
14. Carry out a test measurement with the desired z-range and at small power.
15. Increase the power gradually until the measuring power is reached and carry out a caustic measurement(it might be necessary to adapt some parameters).
16. After finishing the last measurement, the objective should be covered with the alignment tool if it remains
in place. If the device is to be transported, use the aperture lock of the objective.
9.2.2

MSM+ HB with Fiber Bridge (option)

For a device with fiber bridge, pay attention to the traverse range in z-direction because it is limited by thefiber adapter.
For an MSM+ HB10, select the “Fiber mode” measuring mode in the LaserDiagnosticsSoftware LDS. In
this mode, the travel path in x and y direction is blocked (see chapter “9.4.3 Open a measuring mode withadapted toolbench” on page 52 and “9.10 Fiber mode measurement” on page 88).
With the MSM+ HB20, the movement in the x and y directions is blocked at the factory.

NOTICE
Danger of damage due to a collision of the objective with the fiber adapter.
The traverse range of the MSM+ HB in z-direction is limited by the fiber adapter. The maximum traverse range depends on the used type of fiber adapter.
X Please mind the limit values zmax given in Tab. 9.1 on page 46, measured from the surfaceof the aperture plate.

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Aperture platezmax

Fig. 9.1:

Traverse range of the MSM+ HB with fiber bridge

Type of Fiber Adapter

Maximum Traverse range zmax in mm
MSM+ HB

MSM+ HB 20 kW

QBH
HLC-16
LLK-D

106
118
120

26
38
40

Tab. 9.1:

46

Limit Values for zmax

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9.3

Connect / disconnect the device with the LaserDiagnosticsSoftware LDS

9.3.1

Switch on the device and connect it to the LDS

CAUTION
Crushing hazard
The camera housing of the device can be moved along the z-axis.
X Never reach into the traversing range of the camera housing.

NOTICE
Damaging / destroying the device
The camera housing of the device can be moved along the z-axis. Obstacles in the traversing range of the device can lead to collisions and damage the device.
X Always keep the traversing range of the camera housing free of obstacles.
If the camera housing was not in the home position when the device was switched off / disconnected from power source, then it moves to the home position after it is switched on / connected to
power source. This happens even before the device is connected to the LaserDiagnosticsSoftware
LDS. The axes are referenced to the home position.
Observe the correct sequence:• All electrical connections must be established before the device is switched on (see Kapitel “8Connections” on page 35).
• The device must be switched on before the LaserDiagnosticsSoftware LDS is started.
1.

Switch on the device.

On/Off switch

Status display

The operating status is shown in thestatus display. If the device is readyfor operation, the display lights up
white.
If necessary, the camera housing
moves to the home position.

2.
X
X

Use one the following options to startthe LaserDiagnosticsSoftware LDS:
Double-click on the program icon in
the start menu group.
Double-click on the desktop shortcut.
The start logo appears for a short
time.

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The start screen appears.
3.

Select the Measure operating mode.

Only if the Show start screen option isdisabled:
X

Click on the Devices tab and then on
the +Connect to device button.

The Connections window appears.
If you have connected a power meter (e.g.
PowerLossMonitor PLM):
4.

First click on the power meter.

5.

Click on the button Connect todevice.

6.

Then click on the MSM+.

7.

Click on the button Connect todevice again.

If you do not use a power meter, follow
instructions 6. and 7. only.
If the device does not appear:
8.
9.

48

Click on the Search the network
buttonIf the device still does not appear in
the Connections window, see chapter
9.3.2 on page 49.

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9.3.2

If the device does not appear in the connections window

The connection of the device to the LaserDiagnosticsSoftware LDS may be blocked
by the firewall:
X

In Windows > Control panel >Firewall, enable the UDP port 20034

The network address of the PC is notwithin the range of the device.
X

The UDP port should be enabled by a system administrator.

The IP address should be set by a system administrator.

In Windows > Control panel > Network and Sharing Center, assign an
IP address to your PC that is in thesame address range as the device.
The IP address of your device can befound on the identification plate.

If several network interface cards or aUSB3-to-Ethernet card are installed in
the PC, the connection of the device tothe LaserDiagnosticsSoftware LDS may
be blocked by the selection of the wrong
network interface card.
1.

Select the appropriate network cardin the Connections > All window.
The device is displayed in the Connections window.

2.

Click on the device.

3.

Click on the Connect to device
button.

9.3.3

Change the network address of a connected device

For communication in a network, a Static IP address is stored for the device in the LDS and the function
Use DHCP is activated. When establishing a connection, the device will first wait to be assigned a suitable IP
address via DHCP. If this proofs unsuccessful, it will revert to the static IP address.
If Use DHCP is disabled, the device will directly use the static IP address. As a result, the connection can beestablished faster.
For a connected device, both the IP address and the activation of DHCP can be changed.
Change the IP address of a device asfollows:
1.

Click on the Devices tab.

2.

Right-click on the device and selectthe Device settings menu point.

3.

Enter in the desired IP address or use
the Use DHCP function

4.

Confirm the entry with OK.

5.

Switch the device off and on again.

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Disconnect and switch off the device

When measurements are completed, the device must be disconnected from the LaserDiagnosticsSoftware
LDS and switched off.
The camera housing must be in the home position before the device is transported or stored.
If the camera body was not in the home position when the device was switched off, it will moveback to home position when it is switched on again (see chapter 9.3 on page 47).
1.

Click on the Devices tab.

2.

Right-click on the device and selectthe Disconnect menu point.

The Close connection window appears.
3.

Select one of the options offered:X

Confirm by clicking the OK button.
Select this option to prepare thedevice for transport or storage.
The device is disconnected fromthe LaserDiagnosticsSoftware LDS.
The camera housing moves to home
position.

X

Click on the Cancel button.
The device is disconnected fromthe LaserDiagnosticsSoftware LDS.
The camera housing remains in thecurrent axis position.

4.

Switch off the device.
The status display turns off.

5.

Disconnect the electrical connections
if necessary.

50

On/Off switch

Status display

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9.4

General procedure for measuring

This chapter contains general information about the LaserDiagnosticsSoftware LDS. Read this general information before turning to the following chapters on the different measuring tasks.
9.4.1

Open the „Device control“ menu

After connecting the device, the Device control menu must be opened:1.

Click on the Devices tab.

2.

Select the device and click on the device function CCD below the device
name.
The Device control menu with the
Adjustment and Measuring modes
sections opens.

Device function

9.4.2

Move camera housing to desired z-position

The Adjustment area of the Device control menu offers various options for moving the camera housing.
OptionExplanation

z-Position in mm

X

Enter the desired z-position in the input field or use the slider.

Move to axis position

X

Click this button to move the camera housing to the z position specified in the z-Position in mm field.

Move to axis center position

X

Click this button to move the camera housing to the center positionof the (unlocked) z-axis traversing range.

Note that this does not have to be the maximum traversing range ofyour device. If a locked area of the z-axis was stored in the EEPROM
during a previous use of the device, then this locked area is active. The
camera housing then moves to the center position of the unblocked
area.
Tab. 9.2:

Options in the Adjustment area of the Device control menu

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MSM+ HBOpen a measuring mode with adapted toolbench

In the Device control menu, a measuring mode can be selected. Here, all relevant settings for a measuringtask are clearly arranged in a menu. For example, to measure individual planes, the Single planes mode
provides all the options necessary.
The following measuring modes can be selected:• Single planes (see chapter 9.5, „Single planes measurement“, on page 57)• Monitor (see chapter 9.6, „Continuous plane measurement (Monitor)“, on page 66)• Manual caustic (see chapter 9.7, „Manual caustic measurement“, on page 73)• Automatic caustic (see chapter 9.8, „Automatic caustic measurement“, on page 79)• Beam pointing (see chapter 9.9, „Beam pointing“, on page 84)• Fiber mode (see chapter 9.10, „Fiber mode measurement“, on page 88)

Opening a measuring mode and theadapted toolbench
1.

Open the Device control menu
according to chapter 9.4.1 on page
51 .

2.

After opening the Device control
menu, click the button of the desired measuring mode, for example
Single planes.

A drop-down list for changing themeasuring mode appears in the upper area of the Device control menu.
Optional:
3. Click on the arrow to open the dropdown list.
4. Click on the measuring mode towhich you want to switch.

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The toolbench adapted to the selected measuring mode is automatically
opened in the main area of the userinterface.

Only if the Open measurement toolbenches option is disabled in the Extras > Options menu:
The Open measurement toolbenchbutton appears in the upper area of
the Device control menu.
This button also appears for the selected
measuring mode whenever the customized toolbench had been closed.
5.

9.4.4

Click this button to open the adapted
toolbench in the main area of the userinterface.

Configure and save measurement settings

After selecting a measuring mode, numerous measurement and device settings in the Settings and Advanced tabs of the Device control menu can be configured. Which options exactly and what you need to know
about them is described in the following chapters on the different measuring tasks. However, some operating
steps in the Device control menu apply equally to all measuring modes. They are described in the following
overview.
When configuring settings in one mode, note that some options may also be offered in other modes. For example, if a parameter is entered in the Single planes mode, it will automatically be applied to all other modes
that have that same parameter field.
When saving / loading a configuration, note that although the command is made in a specific measuringmode, the saved / loaded data set also includes the settings of the other measuring modes.

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35,0(6MSM+ HBEntering and activating parameters
To transfer a parameter value entered in
the Device control menu to the active
configuration, it must be confirmed with
the Enter key.
1.

2.

Enter the desired value in the parameter field.
The background color of the parameter field changes to blue.
Confirm the entry by pressing theEnter key.
The field returns to its original background color.

Saving a configuration in the device
All options marked with an asterisk in the
Device control menu can be saved in the
EEPROM in the device.
In this case, the settings are retained even
if the device is switched off or disconnected from the power source.
1.

Click on the Advanced tab.

2.

Click on the Save device settings
button.

Saving a safety-relevant locked area
We recommend saving a configuration in
the device especially if a safety-relevant
locked area is configured in the Advanced tab.

If the locked area was configured but
not saved via Save device settings,
then a dialog box appears after
clicking the Start button (to start ameasurement).
X

If you now want to save the locked
area (and the other options marked
with an asterisk) in the device, click
the OK button.

Otherwise, click on the Cancel
button.
x The settings are active during themeasurement, but must be configured again when the device is switched
off or disconnected from the powersource.
X

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Saving a configuration to a file / loading from a file
All options marked with an asterisk in the
Device control menu can be saved to apreset file with the .pre extension.
X

To save a configuration,
click theicon.

X

To load a configuration,
click theicon.

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Messages in the LaserDiagnosticsSoftware LDS during measurement

If problems occur during a measurement, the LDS displays them in different categories and different colors.
Notes
Notes provide assistance in interpretingthe measurement results and are displayed in a blue window.
Use one of the following options:
X Click on the warning triangle in thefooter to display / hide the window.
X If applicable, click the Next message
button to display more messages ofthe same category.
X Click the Confirm button to remove
the displayed message.
Warnings
Non-safety-critical problems that influence
the quality of the measurement results,
for example, are displayed in a yellow
window.
Use one of the following options:
X Click on the warning triangle in thefooter to display / hide the window.
X If applicable, click the Next message
button to display more messages ofthe same category.
X Click the Confirm button to remove
the displayed message.
Safety critical device errors
Safety-critical problems that can result indamage / destruction of the device aredisplayed in a red window.
In this case, proceed as follows:
1. Fix the problem immediately.
2. Click the Confirm button to remove
the message.
The message disappears. If the problem is not fixed, then the message
appears again shortly afterwards.
3. Do not proceed with themeasurement until the problem issolved.

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9.5

Single planes measurement

In the Single planes measuring mode, single planes are measured at selected z-positions. Measurement
window size and exposure can be set automatically or determined freely. You can also have the software
search the laser beam automatically in the entire measurement range.
To measure a custom caustic, several planes can be measured — either individually or by means of a series
measurement. To define the caustic measurement, an increment along the z-axis can be configured.
According to ISO 11146‑1, at least 10 planes shall be measured. Approximately half of the measurements
shall be distributed within one Rayleigh length on either side of the focus, and approximately half of themshall be distributed beyond two Rayleigh lengths from the focus.
By means of the variable integration time control, a large number of pulsed beams can be measured inquasi-cw operation in addition to cw laser beams. An exception are, for example, laser beams with a very
low pulse frequency. Trigger operation is available for measuring such beams. If this is enabled, the device
only measures within defined time periods. The laser pulse or the corresponding trigger signal marks the
beginning of such a period and the (freely adjustable) integration time marks its end. A measurement canbe triggered internally or externally. Internal signals are triggered by the photodiode integrated in the device.
Externally triggered signals enter the device via a BNC socket. For detailed information on the measurementof pulsed laser beams and the trigger operation, please refer to chapter 16.3 on page 110.
9.5.1

Configure settings

1.

Click on the Settings tab.

2.

Maintain the options according to the
explanations in the following table.
Graphic
representation
Measurement range(thin line)

Measurement window(thick line)

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OptionExplanation

Graphic representation

In a window in the upper area of the Settings tab, the measurement
plane is displayed graphically. Here you can see:• the entire measurable area (measurement range, thin lines)• the area to be recorded (measurement window, thick lines)• after a measurement a false-color image of the recorded area
You can make changes in the graphic representation as follows:
X To create a new measurement window, position the mouse pointeranywhere within the measurement range. Drag while holding down
the left mouse button. Keep the mouse button pressed until themeasurement window meets your requirements.
The maximum size of the window depends, among other things, on
the magnification of the measuring objective.
X To move the measurement window to another location, position themouse pointer inside the measurement window. Drag while holding
down the right mouse button.
X To zoom to the center of the graphic representation, first move themouse pointer over the graphic representation until the plus / minus
buttons appear. Then press the buttons.
X To zoom in on the position of the mouse pointer, position the mousepointer anywhere within the graphic representation. Then turn themouse wheel.
X To set the zoom section to the size of the measurement window,
position the mouse pointer inside the measurement window. Thendouble-click left.
X To set the zoom section to the size of the measurement range,
position the mouse pointer outside the measurement window. Thendouble-click left.

z-Position in mm

Use one of the following options to set the desired z-position of theplane to be measured:
X Enter a value in the input field.
X Use the slider on the left side of the graphic representation.

Reset measurement window

X

Click this button to maximize the measurement window and simultaneously center it in the measurement range.

z-Increment in mm

X

If you want to measure multiple planes with fixed spacing, enter thedesired z-increment (see chapter 9.5.4, „Measure further planes“,
on page 65).

Power P in W *To calculate the power density, the laser power used must be entered.
Otherwise, the measured amplitudes are given directly in counts.
X Enter the laser power used during measurement.

autom. Measurement window

If this option is enabled, then the measurement window size will be set
automatically.
X

Window size in mm

Set the check mark to enable the option.

The maximum size of the measurement window depends, among otherthings, on the magnification of the measuring objective.
If the autom. Measurement window option is disabled, the size ofthe measurement window can be adjusted manually. Use one of thefollowing options:
X Enter the length of a horizontal / vertical side in the input field on theleft / right.
X Position the mouse pointer anywhere within the measurement
range and drag while holding down the left mouse button. Keep themouse button pressed until the measurement window meets yourrequirements.

Tab. 9.3:

58

Options in the Device control > Settings tab of the Single planes measuring mode

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OptionExplanation

Position in mm

Use one of the following options to adjust the position of themeasurement window:
X Enter the x-position / y-position of the center of the measurement
window in the input field on the left / right.
X Position the mouse pointer within the measurement window. Thendrag while holding down the right mouse button.

Find beamThis option enables a measurement in which the laser beam is automatically searched for in the entire measurement range. The plane atthe defined z-position is then displayed in the graphic representation.
Measurement window size, integration time, and filter level of the filter
wheel are set automatically.
X

Click on the button to start the beam search.

Note that the determined measurement data will not be saved in the
project tree of the Projects tab.
autom. Exposure

If this option is enabled, the integration time is set automatically.
X

Integration time in ms

Set the check mark to enable the option.

If the autom. Exposure option is disabled, the integration time can be
set manually.
Use one of the following options:
X Enter a value in the input field (0.006 ms to 225 ms).
X Use the slider below the input field.
The selected setting will only be active if the autom. filter adjustment
option is disabled.
The filter required for measurement depends on the wavelength andintensity of the laser beam to be measured. We recommend selecting
a filter level that achieves a detector modulation of between 60 % and80%.

Filter levelXautom. filter adjustment

Select a filter level in the drop-down list.

If this option is enabled, then the filter levels are set automatically.
X

Set the check mark to enable the option.

Time series

A time series consists of several single plane measurements with thesame settings.

Number of measurements *X

Enter the desired number of single plane measurements of the timeseries.

Interval between measurements in s *XEnter the pause between the single plane measurements of the timeseries. This is the time gap between the end of one measurement
and the start of the next.

Parameter settings

All settings in the Device control menu can be individually saved foreach device. The saving location is the local installation of the LaserDiagnosticsSoftware LDS.

Save current parameters

X

Click this button to save all current settings of the connected device.

Load last parameters

X

Click this button to load the last saved device configuration.

Tab. 9.3:

Options in the Device control > Settings tab of the Single planes measuring mode

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Configure advanced settings

1.

Click on the Advanced tab.

2.

Maintain the options according to the
explanations in in the following table:.

OptionExplanation

Save device settings

All options marked with an asterisk in the Device control menu can besaved in the EEPROM of the device.
These and other options for saving / loading configurations are described in chapter 9.4.4 on page 53.

# Pixel in x/y *This option enables setting the resolution of the CCD sensor:
X Enter the number of pixels in the x-direction / y-direction in the input
field on the left / right.

Low power modeThis option is only relevant when performing a beam search (Find beam
option, see chapter 9.5.1 on page 57). We recommend activating it
for low power laser beams (< 1 W).
If this option is enabled, the following initial values are selected during
beam search• Filter level of the filter wheel: 0 (instead of 1 otherwise)• Integration time: 10 ms (instead of 1 ms otherwise).

Calibrated wavelength(s) in nm *X

Set the check mark to enable the option.

X

Select the calibrated wavelength in the drop-down list.

The values displayed correspond to the calibration points of themeasuring objective. The correct value should be selected before eachmeasurement to enable high measurement accuracy.
Used wavelength in nm *Use one of the following options to set the used wavelength of the laser:
X Enter a value in the input field.
X Use the slider below the input field.
This parameter must be distinguished from the factory calibrated wavelength of the measuring objective. The exact value should be entered,because it is used for calculating the significant beam quality factor M².
The wavelength used should approximately match the calibrated wavelength. To enable high measurement accuracy, a pre­configured acceptance range must be observed. For example, if the calibration point
1 064 nm is selected, measurements can be taken in a range between
1 030 and 1 100 nm with high measurement accuracy.
Hence the value from the Calibrated wavelength in nm option is automatically adopted in the input field if a new selection was made there.
If this value is replaced by an impermissible high / low value, the impermissible value is automatically overwritten with the maximum / minimum
permissible value.

Magnification

This field displays the magnification of the measuring objective.

Focal length of focusing optics in mm *X

Enter the focal length used by the focusing optics of the laser
system.

If several planes of a caustic have been measured, the caustic fit and theentered focal length are used to calculate the raw beam diameter on thefocusing optics.
Tab. 9.4:

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Options in the Device control > Advanced tab of the Single planes measuring mode

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OptionExplanation

Averaging *If this option is enabled, different algorithms for averaging a planemeasurement can be selected in the drop-down list below. Averaging
over several measurements can be useful, for example, when measuring
a laser with significant power fluctuations.
1.
2.
•
•
•

Set the check mark to enable the option
Select an algorithm from the drop-down list:
Arithmetic mean: The measured values for each pixel are added
together and divided by the number of planes.
Max. intensity per pixel: The values from all the measurements arecompared for each pixel and only the maximum value for each one
is displayed.
Max. lines: The values from all the measurements are compared foreach line (meaning the line issuing from the measuring device in thex-direction for example) and only the maximum value for each one isdisplayed.
With the Averaging option enabled, enter the number of planemeasurements for averaging.

Number of averaged planes *X

TriggerDrop-down area for displaying the options of the trigger operation.
The trigger operation is suitable for measuring special pulsed beams.
Detailed information on this topic can be found in the chapter 16.3 on
page 110.

Drop-down list for trigger selection

This drop-down list is only visible if the drop-down area for displaying theoptions of the trigger operation is open.
You can select from the following options:• UseNoTrigger: Switches to the default cw / quasi-cw operation.
• UsePhotoTrigger: Switches to a trigger operation in which themeasurement is triggered internally. The signals come from thephotodiode built into the device.
• UseExternalTrigger: Switches to a trigger operation in which themeasurement is triggered externally. The trigger signals enter thedevice via the BNC socket.

TriggerDelay in ms *This drop-down list is only visible if the drop-down area for displaying theoptions of the trigger operation is open.
The trigger delay specifies the period between the trigger signal and the
beginning of the integration time. Use one of the following options to set
the trigger delay time:
X Enter a value in the input field (0.012 ms to 400 ms).
X Use the slider below the input field.

TriggerLevel *This drop-down list is only visible if the drop-down area for displaying theoptions of the trigger operation is open.
The trigger level is the threshold value for triggering a signal via the internal photodiode. Use one of the following options to set the trigger level:
X Enter a value in the input field.
X Use the slider below the input field.
You can determine the threshold value suitable for a measurement task
as follows:
1. Set the trigger level to the maximum value.
2. Decrease the value step by step until the device receives sometrigger signals (lower trigger level).
3. Increase the value until the device does not receive any trigger
signals (upper trigger level).
4. Calculate the trigger level as the arithmetic mean of the two limit
values.

Tab. 9.4:

Options in the Device control > Advanced tab of the Single planes measuring mode

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OptionExplanation

Locked area

Locked area means a restriction of the traversing range in the z-direction. The lower limit of the enabled traversing range is always home
position. The upper limit can be set freely.

Maximum z-Position in mm *1.
X
X

Use one of the following options to set the locked area:
Enter the upper limit of the permitted z-traversing range in the input
field.
Use the slider below the input field.

We recommend saving a locked area in the device, if it is safety-relevant:
2. If you want to save the locked area (and the other options marked
with an asterisk) in the device, click the Save device settings
button.
x The settings are retained even if the device is switched off or disconnected from the power source.

Tab. 9.4:

62

Options in the Device control > Advanced tab of the Single planes measuring mode

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Measure a plane

DANGER
Serious eye or skin injury due to laser radiation
X Observe the warning messages in chapter 9.1 on page 44.
1.

Switch on the laser.

2.

Click on the Settings tab.

3. Click on the Find beam button.
x The laser beam is automatically searched for in the entire
measurement range. Measurement
window size, integration time and filter
level of the filter wheel are set automatically.
If the search is successful, the beam
is displayed in the graphic representation.
If the beam is not displayed:
4. Select the Low power mode option
or increase the integration time or select a weaker filter of the filter wheel.
5. Select a different z-position.
6. Check again the correct alignment of
the device on the x-y plane.
7. Increase the laser power (step bystep).

As soon as the beam is displayed:
8. Click the Start button.
x The measurement begins.
9.

Optional:
If necessary, click the Stop button toend the measurement prematurely.

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During the measurement, the progress is shown in the following indicators:
Measuring plane
While the indicator is rotating, themeasurement is performed.
Measurement completed
After successful measurement, the indicator lights up green.
10. Switch off the laser after themeasurement is completed, unless
you want to perform further measurements.
Averaging (if enabled)
The indication shows the measured planes that are used to average a measured
value.
Adjusting size and position of themeasurement window (optional)
11. Make sure that the autom.
Measurement window option is notenabled. Otherwise, the manual setting may be overwritten when startinga measurement.
12. Use one of the following options toadjust the size of the measurement
window:
X Enter the length and width in thecorresponding fields.
X Position the mouse pointer anywhere within the measurement range
and drag while holding down theleft mouse button. Keep the mousebutton pressed until the measurement
window meets your requirements.
13. Use one of the following options to adjust the position of themeasurement window:
X Enter the x-position / y-position of thecenter of the measurement window inthe corresponding fields.
X Position the mouse pointer within themeasurement window. Then dragwhile holding down the right mousebutton.
14. Click the Start button to perform themeasurement in the manually customized measurement window.
15. Switch off the laser after themeasurement is completed, unless
you want to perform further measurements.

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Measure further planes

Directly after a plane measurement, further measurements at other z-positions can be performed. Doing so acaustic with individual increments can be measured.
Single measurement at a specificz‑position
1.

Click on the Settings tab.

2.

In the z-Position in mm field, enter
the desired position of the next plane
to be measured.

3.

Start and stop the measurement
according to chapter 9.5.3 on page
63.

Single measurements using z-increment spacing
1.
2.

Click on the Settings tab.
Enter the spacing for the further
measurements in the z-Increment in
mm field.
3. Start a measurement by clicking on
the Start button and wait until themeasurement is completed (seechapter 9.5.3 on page 63).
x The measured plane is one z‑increment away from the previously
measured plane.
4. Click the start button again and wait
until the measurement is completed(see chapter 9.5.3 on page 63).
x The measured plane is one z‑increment away from the previously
measured plane.
5. Repeat the last step as often as you
like.
Series measurement using z-increment
spacing
The combination of the Time series andz‑Increment in mm options enables
measuring a free caustic in one run.
1.
2.
3.

Click on the Settings tab.
Enter the spacing for the planes to bemeasured in the z-Increment in mm
field.
In the Number of measurements
and Interval between measurements in s fields, enter the number ofmeasurements and the interval. Theinterval is the time between the endof one measurement and the start of
the next.
Start and stop the series
measurement according to chapter
9.5.3 on page 63.

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Continuous plane measurement (Monitor)

In the Monitor measuring mode, you can continuously view the beam profile at a selected z-position in a
false color image. First of all, you can have the laser beam automatically searched for at the z position in theentire measurement range. After a successful search the measurement can be run as long as desired. During
the measurement, data is continuously being read out and displayed with a high frame rate. The z-position of
the camera housing can be changed during measurement. Measurement data is not saved in the project treeof the Projects tab.
9.6.1

Configure settings

1.

Click on the Settings tab.

2.

Maintain the options according to the
explanations in in the following table..
Graphic
representation
Measurement range(thin line)

Measurement window(thick line)

OptionExplanation

Graphic representation

In a window in the upper area of the Settings tab, the measurement
plane is displayed graphically. Here you can see:• the entire measurable area (measurement range, thin lines)• the area to be recorded (measurement window, thick lines)• after a measurement a false-color image of the recorded area
You can make changes in the graphic representation as follows:
X To create a new measurement window, position the mouse pointeranywhere within the measurement range. Drag while holding down
the left mouse button. Keep the mouse button pressed until themeasurement window meets your requirements.
The maximum size of the window depends, among other things, on
the magnification of the measuring objective).
X To move the measurement window to another location, position themouse pointer inside the measurement window. Drag while holding
down the right mouse button.
X To zoom to the center of the graphic representation, first move themouse pointer over the graphic representation until the plus / minus
buttons appear. Then press the buttons.
X To zoom in on the position of the mouse pointer, position the mousepointer anywhere within the graphic representation. Then turn themouse wheel.
X To set the zoom section to the size of the measurement window,
position the mouse pointer inside the measurement window. Thendouble-click left.
X To set the zoom section to the size of the measurement range,
position the mouse pointer outside the measurement window. Thendouble-click left.

Tab. 9.5:

66

Options in the Device control > Settings tab of the Monitor measuring mode

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OptionExplanation

z-Position in mm

Use one of the following options to set the desired z-position of theplane to be measured:
X Enter a value in the input field.
X Use the slider on the left side of the graphic representation.

Reset measurement window

X

Window size in mm

The maximum size of the window depends, among other things, on themagnification of the measuring objective.

Click this button to maximize the measurement window and simultaneously center it in the measurement range.

Use one of the following options to adjust the size of the measurement
window:
X Enter the length of a horizontal / vertical side in the input field on theleft / right.
X Position the mouse pointer anywhere within the measurement
range and drag while holding down the left mouse button. Keep themouse button pressed until the measurement window meets yourrequirements.
Position in mm

Use one of the following options to adjust the position of themeasurement window:
X Enter the x-position / y-position of the center of the measurement
window in the input field on the left / right.
X Position the mouse pointer within the measurement window. Thendrag while holding down the right mouse button.

Find beamThis option enables a measurement in which the laser beam is automatically searched for in the entire measurement range. The plane atthe defined z-position is then displayed in the graphic representation.
Measurement window size, integration time, and filter level of the filter
wheel are set automatically.
X

Click on the button to start the beam search.

Note that the determined measurement data will not be saved in the
project tree of the Projects tab.
autom. Exposure

If this option is enabled, then the integration time is set automatically.
X

Integration time in ms

Set the check mark to enable the option.

If the autom. Exposure option is disabled, the integration time can be
set manually.
Use one of the following options:
X Enter a value in the input field (0.006 ms to 225 ms).
X Use the slider below the input field.
The selected setting will only be active if the autom. filter adjustment
option is disabled.
The filter required for measurement depends on the wavelength andintensity of the laser beam to be measured. We recommend selecting
a filter level that achieves a detector modulation of between 60 % and80%.

Filter levelXautom. filter adjustment

If this option is enabled, then the filter levels are set automatically.
X

Tab. 9.5:

Select a filter level in the drop-down list.

Set the check mark to enable the option.

Options in the Device control > Settings tab of the Monitor measuring mode

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OptionExplanation

Fast Mode

If this option is enabled, the plane is displayed with a higher frame rate.
Note, however, that no corrective measurements are then performed.
The measurement data may therefore be affected by measurement
artefacts such as the readout noise "smear effect". In addition, no radii
are displayed in the False-color image tool.
X

Set the check mark to enable the option.

Parameter settings

All settings in the Device control menu can be individually saved foreach device. The saving location is the local installation of the LaserDiagnosticsSoftware LDS.

Save current parameters

X

Click this button to save all current settings of the connected device.

Load last parameters

X

Click this button to load the last saved device configuration.

Tab. 9.5:

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Options in the Device control > Settings tab of the Monitor measuring mode

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9.6.2

Configure advanced settings

1.

Click on the Advanced tab.

2.

Maintain the options according to the
explanations in in the following table..

OptionExplanation

Save device settings

All options marked with an asterisk in the Device control menu can besaved in the EEPROM of the device.
These and other options for saving / loading configurations are described in chapter 9.4.4 on page 53.

# Pixel in x/y *This option enables setting the resolution of the CCD sensor:
X Enter the number of pixels in the x-direction / y-direction in the input
field on the left / right.

Magnification

This field displays the magnification of the measuring objective.

Low power modeThis option is only relevant when performing a beam search (Find beam
option, see chapter 9.6.1 on page 66). We recommend activating it
for low power laser beams (< 1 W).
If this option is enabled, the following initial values are selected during
beam search• Filter level of the filter wheel: 0 (instead of 1 otherwise)• Integration time: 10 ms (instead of 1 ms otherwise).
X

Set the check mark to enable the option.

Locked area

Locked area means a restriction of the traversing range in the z-direction. The lower limit of the enabled traversing range is always home
position. The upper limit can be set freely.

Maximum z-Position in mm *1.
X
X

Use one of the following options to set the locked area:
Enter the upper limit of the permitted z-traversing range in the input
field.
Use the slider below the input field.

We recommend saving a locked area in the device, if it is safety-relevant:
2. If you want to save the locked area (and the other options marked
with an asterisk) in the device, click the Save device settings
button.
x The settings are retained even if the device is switched off or disconnected from the power source.

Tab. 9.6:

Options in the Device control > Advanced tab of the Monitor measuring mode

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MSM+ HB

Aligne the MSM+ HB with the Monitor measuring mode

Using a pilot laser:
You can use the continuous plane measurement to align the MSM+ HB. Use the pilot laser for this purpose.
1.

Switch on the pilot laser.

2.

Click on the Advanced tab.

3.

Activate Low power mode

4.

Click on the Settings tab.

5. Click on the Find beam button.
x The laser beam is automaticallysearched for in the entire measuring
range.
After a successful search, the beam isdisplayed in the graphical representation..

Using a laser of laser class 4:

DANGER
Serious eye or skin injury due to laser radiation
X Only align the device using a laser (laser class 4) if the process is carried out remotely
behind a separating protective equipment. The protective equipment must be suitable forblocking the radiation or attenuating it to a non-hazardous level. Use the laser‘s low power
mode.
Only align the device by means of a laser of laser class 4 if
• alignment with the pilot laser is not possible and• the process is carried out remotely behind a separating protective equipment. The protective equipment
must be suitable for blocking the radiation or attenuating it to a non-hazardous level. Use the lowest
possible power on the laser.

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9.6.4

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Measure a plane continuously

1.

Switch on the laser.

2.

Click on the Settings tab.

3. Click on the Find beam button.
x The laser beam is automatically searched for in the entire
measurement range. Measurement
window size, integration time and filter
level of the filter wheel are set automatically.
If the search is successful, the beam
is displayed in the graphic representation.
If the beam is not displayed:
4. Select the Low power mode option
or increase the integration time or select a weaker filter of the filter wheel.
5. Select a different z-position.
6. Check again the correct alignment of
the device on the x-y plane.
7. Increase the laser power (step bystep).

As soon as the beam is displayed:
8. Click the Start button.
x The measurement begins.

Data is continuously read out from thepreviously set measurement window
and displayed with a high frame ratein the false-color image.
9.

To stop the measurement, click on
the Stop button.

10. Switch off the laser after themeasurement is completed, unless
you want to perform further measurements.

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Adjusting size and position of themeasurement window (optional)
11. Make sure that the autom.
Measurement window option is notenabled. Otherwise, the manual setting may be overwritten when startinga measurement.
12. Use one of the following options toadjust the size of the measurement
window:
X Enter the length of a horizontal /vertical side in the input field on theleft / right.
X Position the mouse pointer anywhere within the measurement range
and drag while holding down theleft mouse button. Keep the mousebutton pressed until the measurement
window meets your requirements.
13. Use one of the following options to adjust the position of themeasurement window:
X Enter the x-position / y-position of thecenter of the measurement window in
the input field on the left / right.
X Position the mouse pointer within themeasurement window. Then dragwhile holding down the right mousebutton.
14. Click the Start button to perform themeasurement in the manually customized measurement window.
15. To stop the measurement, click on
the Stop button.
16. Switch off the laser after themeasurement is completed, unless
you want to perform further measurements.

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9.7

Manual caustic measurement

In the Manual caustic measuring mode, only the z‑range and the number of planes have to be specified.
All other required settings are automatically determined and adjusted. In addition, advanced settings can beapplied.
According to ISO 11146‑1, at least 10 planes shall be measured. Approximately half of the measurements
shall be distributed within one Rayleigh length on either side of the focus, and approximately half of themshall be distributed beyond two Rayleigh lengths from the focus.
For two reasons, an odd number of measuring planes makes it more likely that the focal plane will be measured. First, the LaserDiagnosticsSoftware LDS always sets the spacing between the measuring planes equal.
Second, the measuring range along the z-axis is almost always symmetrical around the focus. We recommend measuring at least 21 planes within 6 Rayleigh lengths.
By means of the variable integration time control, not only cw lasers but also pulsed lasers can be measured
in quasi-cw operation. An exception are, for example, laser beams with a very low pulse frequency. Trigger
operation is available for measuring such beams. If this is enabled, the device only measures within definedtime periods. The laser pulse or the corresponding trigger signal marks the beginning of such a period andthe (freely adjustable) integration time marks its end. A measurement can be triggered internally or externally.
Internal signals are triggered by the photodiode integrated in the device. Externally triggered signals enter thedevice via a BNC socket. For detailed information on the measurement of pulsed laser beams and the trigger
operation, please refer to chapter 16.3 on page 110.
9.7.1

Configure settings

1.

Click on the Settings tab.

2.

Maintain the options according to the
explanations in in the following table..

OptionExplanation

Optimized measurement settings

If this option is activated, the measurement takes shorter time. Fewer process steps are required, since the initial settings for a plane measurement are taken from the settings of the previous planemeasurement.
Please note, however, that beam artefacts may not be adequately
detected in the single plane measurements due to the transfer of thesettings.
X

Set the check mark to activate the option.

Number of planes *X

Enter the number of planes to be measured.

z-Axis position (z1 / z2) in mm *This option enables configuring the z‑range in which the measurement is
to be performed.
X Regarding the traversing range in which the measurement is to be
performed, enter the lower limit z1 in the left field and the upper limit
z2 in the right field.
X Alternatively, use the sliders.

Caustic suggestion

When a caustic measurement is completed, a z-range is displayed inthese fields. The limits of the suggested z-range have a distance of± 3 Rayleigh lengths to the determined beam focus. This z-range is
optimized according to Primes quality criteria.

Tab. 9.7:

Options in the Device control > Settings tab of the Manual caustic measuring mode

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OptionExplanation

Use

X

Click this button to transfer the z-values displayed in the Caustic
suggestion fields to the z-Axis position (z1 / z2) in mm fields.

Reset z-Axis position

X

Click this button to reset the z-axis position to the default values

Power P in W *To calculate the power density, the laser power used must be entered.
Otherwise, the measured amplitudes are given directly in counts.
X Enter the laser power used during measurement.

Filter level

The selected setting will only be active if the autom. filter adjustment
option is disabled.
The filter required for measurement depends on the wavelength andintensity of the laser beam to be measured. We recommend selecting
a filter level that achieves a detector modulation of between 60 % and80%.
Xautom. filter adjustment

Select a filter level in the drop-down list.

If this option is enabled, then the filter levels are set automatically.
X

Set the check mark to enable the option.

Time series

A time series consists of several caustic measurements with the samesettings.

Number of measurements *X

Enter the desired number of caustic measurements of the timeseries.

Interval between measurements in s *XEnter the pause between the caustic measurements of the timeseries. This is the time gap between the end of one measurement
and the start of the next.

Tab. 9.7:

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Options in the Device control > Settings tab of the Manual caustic measuring mode

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9.7.2

Configure advanced settings

1.

Click on the Advanced tab.

2.

Maintain the options according to the
explanations in in the following table..

OptionExplanation

Save device settings

All options marked with an asterisk in the Device control menu can besaved in the EEPROM of the device.
These and other options for saving / loading configurations are described in chapter 9.4.4 on page 53.

# Pixel in x/y *This option enables setting the resolution of the CCD sensor:
X Enter the number of pixels in the x-direction / y-direction in the input
field on the left / right.

Averaging *If this option is enabled, different algorithms for averaging a planemeasurement can be selected in the drop-down list below. Averaging
over several measurements can be useful, for example, when measuring
a laser with significant power fluctuations.
1.
2.
•
•
•

Set the check mark to enable the option
Select an algorithm from the drop-down list:
Arithmetic mean: The measured values for each pixel are added
together and divided by the number of planes.
Max. intensity per pixel: The values from all the measurements arecompared for each pixel and only the maximum value for each one
is displayed.
Max. lines: The values from all the measurements are compared foreach line (meaning the line issuing from the measuring device in thex-direction for example) and only the maximum value for each one isdisplayed.
With the Averaging option enabled, enter the number of planemeasurements for averaging.

Number of averaged planes *X

Low power mode

We recommend enabling this option for relatively low power laser beams.
If this option is enabled, the following initial values are selected during
beam search• Filter level of the filter wheel: 0 (instead of 1 otherwise)• Integration time: 10 ms (instead of 1 ms otherwise).

Calibrated wavelength(s) in nm *X

Set the check mark to enable the option.

X

Select the calibrated wavelength in the drop-down list.

The values displayed correspond to the calibration points of themeasuring objective. The correct value should be selected before eachmeasurement to enable high measurement accuracy.
Tab. 9.8:

Options in the Device control > Advanced tab of the Manual caustic measuring mode

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OptionExplanation

Used wavelength in nm *Use one of the following options to set the used wavelength of the laser:
X Enter a value in the input field.
X Use the slider below the input field.
This parameter must be distinguished from the factory calibrated wavelength of the measuring objective. The exact value should be entered,because it is used for calculating the significant beam quality factor M².
The wavelength used should approximately match the calibrated wavelength. To enable high measurement accuracy, a pre­configured acceptance range must be observed. For example, if the calibration point
1 064 nm is selected, measurements can be taken in a range between
1 030 and 1 100 nm with high measurement accuracy.
Hence the value from the Calibrated wavelength in nm option is automatically adopted in the input field if a new selection was made there.
If this value is replaced by an impermissible high / low value, the impermissible value is automatically overwritten with the maximum / minimum
permissible value.

Magnification

This field displays the magnification of the measuring objective.

Focal length of focusing optics in mm *X

Enter the focal length used by the focusing optics of the laser
system.

The caustic fit and the entered focal length are used to calculate the raw
beam diameter on the focusing optics.
Drop-down area for displaying the options of the trigger operation.

Trigger

The trigger operation is suitable for measuring special pulsed beams.
Detailed information on this topic can be found in the chapter 16.3 on
page 110.
Drop-down list for trigger selection

This drop-down list is only visible if the drop-down area for displaying theoptions of the trigger operation is open.
You can select from the following options:• UseNoTrigger: Switches to the default cw / quasi-cw operation.
• UsePhotoTrigger: Switches to a trigger operation in which themeasurement is triggered internally. The signals come from thephotodiode built into the device.
• UseExternalTrigger: Switches to a trigger operation in which themeasurement is triggered externally. The trigger signals enter thedevice via the BNC socket.

TriggerDelay in ms *This drop-down list is only visible if the drop-down area for displaying theoptions of the trigger operation is open.
The trigger delay specifies the period between the trigger signal and the
beginning of the integration time. Use one of the following options to set
the trigger delay time:
X Enter a value in the input field (0.012 ms to 400 ms).
X Use the slider below the input field.

Tab. 9.8:

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OptionExplanation

TriggerLevel *This drop-down list is only visible if the drop-down area for displaying theoptions of the trigger operation is open.
The trigger level is the threshold value for triggering a signal via the internal photodiode. Use one of the following options to set the trigger level:
X Enter a value in the input field.
X Use the slider below the input field.
You can determine the threshold value suitable for a measurement task
as follows:
1. Set the trigger level to the maximum value.
2. Decrease the value step by step until the device receives sometrigger signals (lower trigger level).
3. Increase the value until the device does not receive any trigger
signals (upper trigger level).
4. Calculate the trigger level as the arithmetic mean of the two limit
values.

Locked area

Locked area means a restriction of the traversing range in the z-direction. The lower limit of the enabled traversing range is always home
position. The upper limit can be set freely.

Maximum z-Position in mm *1.
X
X

Use one of the following options to set the locked area:
Enter the upper limit of the permitted z-traversing range in the input
field.
Use the slider below the input field.

We recommend saving a locked area in the device, if it is safety-relevant:
2. If you want to save the locked area (and the other options marked
with an asterisk) in the device, click the Save device settings
button.
x The settings are retained even if the device is switched off or disconnected from the power source.

Tab. 9.8:

Options in the Device control > Advanced tab of the Manual caustic measuring mode

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MSM+ HB

Measure a caustic manually

DANGER
Serious eye or skin injury due to laser radiation
X Observe the warning messages in chapter 9.1 on page 44.
1.

Switch on the laser.

2. Click the Start button.
x The measurement begins.
3.

Optional:
If necessary, click the Stop button toend the measurement prematurely.
During the measurement, the progress is shown in the following indicators:

Measuring caustic
While the indicator is rotating, themeasurement is performed. The
measurement parameters are optimized
according to Primes quality criteria.
Measurement completed
After successful measurement, the indicator lights up green.
4.

Switch off the laser after themeasurement is completed, unless
you want to perform further measurements.

Averaging (if enabled)
The indication shows the measured planes that are used to average a measured
value.
Applying a caustic suggestion (optional)
After the measurement is completed,a z-range is displayed in the Caustic
suggestion fields. The limits of thesuggested z-range have a distance of± 3 Rayleigh lengths to the determined beam waist position.
This z-range is optimized according
to Primes quality criteria.
5.

If you want to apply this suggestion,
click the Use button.
The suggested limit values z1 / z2 aretransfered to the z-Axis position (z1 /z2) in mm fields.

6.

Click the Start button again to perform the measurement in the suggested z-range.

7.

Switch off the laser after themeasurement is completed, unless
you want to perform further measurements.

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9.8

Automatic caustic measurement

In the Automatic caustic measuring mode, only press the start button to automatically determine a caustic.
The centre axis position is preset as the z position. The default setting for the number of measuring planes is
21. The z-range as well as all other required settings are determined and adjusted automatically. In addition,
advanced settings can be applied.
According to ISO 11146‑1, at least 10 planes shall be measured. Approximately half of the measurements
shall be distributed within one Rayleigh length on either side of the focus, and approximately half of themshall be distributed beyond two Rayleigh lengths from the focus.
For two reasons, an odd number of measuring planes makes it more likely that the focal plane will be measured. First, the LaserDiagnosticsSoftware LDS always sets the spacing between the measuring planes equal.
Second, the measuring range along the z-axis is almost always symmetrical around the focus. We recommend measuring at least 21 planes within 6 Rayleigh lengths.
By means of the variable integration time control, not only cw lasers but also pulsed lasers can be measured
in quasi-cw operation. An exception are, for example, laser beams with a very low pulse frequency. Trigger
operation is available for measuring such beams. If this is enabled, the device only measures within definedtime periods. The laser pulse or the corresponding trigger signal marks the beginning of such a period andthe (freely adjustable) integration time marks its end. A measurement can be triggered internally or externally.
Internal signals are triggered by the photodiode integrated in the device. Externally triggered signals enter thedevice via a BNC socket. For detailed information on the measurement of pulsed laser beams and the trigger
operation, please refer to chapter 16.3 on page 110.
9.8.1

Configure settings

1.

Click on the Settings tab.

2.

Maintain the options according to the
explanations in the following table.

OptionExplanation

z-Position in mm

The centre axis position is selected as the default setting.
Use one of the following options to set the initial z-position for the precaustic measurement:
X Enter a value in the input field.
X Use the slider below the input field.

Parking position after caustic

X

In the drop-down list, select the parking position to which the camera housing will be moved after the caustic measurement.

You can select from the following options:• Focus: The camera housing is moved back to the position of thedetermined beam focus.
• Start position: The camera housing is moved back to the start
position.
• Final position: The camera housing remains in the final position.
The selected position is also the start position for the pre-caustic
measurement of the next measurement (unless you enter a different
value in the z-Position in mm field).
Power P in W *Tab. 9.9:

To calculate the power density, the laser power used must be entered.
Otherwise, the measured amplitudes are given directly in counts.
X Enter the laser power used during measurement.

Options in the Device control > Settings tab of the Automatic caustic measuring mode

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OptionExplanation

Filter level

The selected setting will only be active if the autom. filter adjustment
option is disabled.
The filter required for measurement depends on the wavelength andintensity of the laser beam to be measured. We recommend selecting
a filter level that achieves a detector modulation of between 60 % and80%.
Xautom. filter adjustment

Select a filter level in the drop-down list.

If this option is enabled, then the filter levels are set automatically.
X

Set the check mark to enable the option.

Time series

A time series consists of several caustic measurements with the samesettings.

Number of measurements *X

Enter the desired number of caustic measurements of the timeseries.

Interval between measurements in s *XEnter the pause between the caustic measurements of the timeseries. This is the time gap between the end of one measurement
and the start of the next.

Tab. 9.9:

9.8.2

Options in the Device control > Settings tab of the Automatic caustic measuring mode

Configure advanced settings

1.

Click on the Advanced tab.

2.

Maintain the options according to the
explanations in the following table..

OptionExplanation

Save device settings

All options marked with an asterisk in the Device control menu can besaved in the EEPROM of the device.
These and other options for saving / loading configurations are described in chapter 9.4.4 on page 53.

# Pixel in x/y *This option enables setting the resolution of the CCD sensor:
X Enter the number of pixels in the x-direction / y-direction in the input
field on the left / right.

Number of planes *The default setting is 21 planes.
X Enter the number of planes to be measured.

Low power mode

We recommend enabling this option for relatively low power laser beams.
If this option is enabled, the following initial values are selected during
beam search• Filter level of the filter wheel: 0 (instead of 1 otherwise)• Integration time: 10 ms (instead of 1 ms otherwise).
X

Tab. 9.10:

80

Set the check mark to enable the option.

Options in the Device control > Advanced tab of the Automatic caustic measuring mode

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OptionExplanation

Calibrated wavelength(s) in nm *X

Select the calibrated wavelength in the drop-down list.

The values displayed correspond to the calibration points of themeasuring objective. The correct value should be selected before eachmeasurement to enable high measurement accuracy.
Used wavelength in nm *Use one of the following options to set the used wavelength of the laser:
X Enter a value in the input field.
X Use the slider below the input field.
This parameter must be distinguished from the factory calibrated wavelength of the measuring objective. The exact value should be entered,because it is used for calculating the significant beam quality factor M².
The wavelength used should approximately match the calibrated wavelength. To enable high measurement accuracy, a pre­configured acceptance range must be observed. For example, if the calibration point
1 064 nm is selected, measurements can be taken in a range between
1 030 and 1 100 nm with high measurement accuracy.
Hence the value from the Calibrated wavelength in nm option is automatically adopted in the input field if a new selection was made there.
If this value is replaced by an impermissible high / low value, the impermissible value is automatically overwritten with the maximum / minimum
permissible value.

Magnification

This field displays the magnification of the measuring objective.

Focal length of focusing optics in mm *X

Enter the focal length used by the focusing optics of the laser
system.

The caustic fit and the entered focal length are used to calculate the raw
beam diameter on the focusing optics.
Drop-down area for displaying the options of the trigger operation.

Trigger

The trigger operation is suitable for measuring special pulsed beams.
Detailed information on this topic can be found in the chapter 16.3 on
page 110.
Drop-down list for trigger selection

This drop-down list is only visible if the drop-down area for displaying theoptions of the trigger operation is open.
You can select from the following options:• UseNoTrigger: Switches to the default cw / quasi-cw operation.
• UsePhotoTrigger: Switches to a trigger operation in which themeasurement is triggered internally. The signals come from thephotodiode built into the device.
• UseExternalTrigger: Switches to a trigger operation in which themeasurement is triggered externally. The trigger signals enter thedevice via the BNC socket.

TriggerDelay in ms *This drop-down list is only visible if the drop-down area for displaying theoptions of the trigger operation is open.
The trigger delay specifies the period between the trigger signal and the
beginning of the integration time. Use one of the following options to set
the trigger delay time:
X Enter a value in the input field (0.012 ms to 400 ms).
X Use the slider below the input field.

Tab. 9.10:

Options in the Device control > Advanced tab of the Automatic caustic measuring mode

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OptionExplanation

TriggerLevel *This drop-down list is only visible if the drop-down area for displaying theoptions of the trigger operation is open.
The trigger level is the threshold value for triggering a signal via the internal photodiode. Use one of the following options to set the trigger level:
X Enter a value in the input field.
X Use the slider below the input field.
You can determine the threshold value suitable for a measurement task
as follows:
1. Set the trigger level to the maximum value.
2. Decrease the value step by step until the device receives sometrigger signals (lower trigger level).
3. Increase the value until the device does not receive any trigger
signals (upper trigger level).
4. Calculate the trigger level as the arithmetic mean of the two limit
values.

Locked area

Locked area means a restriction of the traversing range in the z-direction. The lower limit of the enabled traversing range is always home
position. The upper limit can be set freely.

Maximum z-Position in mm *1.
X
X

Use one of the following options to set the locked area:
Enter the upper limit of the permitted z-traversing range in the input
field.
Use the slider below the input field.

We recommend saving a locked area in the device, if it is safety-relevant:
2. If you want to save the locked area (and the other options marked
with an asterisk) in the device, click the Save device settings
button.
x The settings are retained even if the device is switched off or disconnected from the power source.

Tab. 9.10:

82

Options in the Device control > Advanced tab of the Automatic caustic measuring mode

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9.8.3

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Measure a caustic automatically

DANGER
Serious eye or skin injury due to laser radiation
X Observe the warning messages in chapter 9.1 on page 44.
1.

Switch on the laser.

2.

Start the measurement by clicking on
the Start button.
The measurement can be ended
prematurely by clicking on the red
Stop button.
During the measurement, the progress is shown in the following indicators:

Pre-caustic
While the indicator is rotating, themeasurement parameters are determined
automatically (for example measurement
window position, measurement window size, integration time, z-range). The
measurement parameters are optimized
according to Primes quality criteria.
After successful pre-caustic
measurement, the indicator lights up
green.
Measuring caustic
While the indicator is rotating, the actual
measurement is performed.
Measurement completed
The measurement, is completed.
3.

Switch off the laser after themeasurement is completed, unless
you want to perform further measurements.

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Beam pointing

In this measuring mode, the pointing stability of a laser beam is measured and evaluated. For this purpose
the MSM+ HB alternately performs measurements at two different z-positions. As a result the position of
the center of gravity towards the tool center point (TCP) as well as the tilting towards the optical axis of thedevice is determined.

After running a fully automatic pre-caustic, that is ideally started slightly above focus, the MSM+ HB determines on the z-axis the focus position (z0) and Rayleigh length (zR) of the beam to be analyzed.
For the xy-planes at z1 (focus position) and z2 (-2zR), the x/y coordinates of the center of gravity are determined.
The following figure shows an example for a center of gravity (beam center).

The coordinates are used to calculate the following values:- x/y position and- tilting (angle)

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These two values are displayed in the two coordinate windows of the Beam Pointing tool

9.9.1

Configure settings

1.

Click on the Settings tab.

2.

Maintain the options according to the
explanations in the following table.

OptionExplanation

z-Position in mm

Use one of the following options to specify the desired initial z-positionof the camera housing for the pre-caustic measurement:
X Enter a value in the input field.
X Use the slider below the input field.
It is recommended to start the pre-caustic 1 or 2 Rayleighlength above
focus.

Number of measurements

X

Enter the number of measurements. The default setting is 15 measurements.

With this input you determine the number of measuring points that are
displayed in the coordinate windows of the Beam Pointing Stability
tool.
For an unlimitted and recorded measurement enter the value „0“.
z-Axis position (z1 / z2)
Tab. 9.11:

The measuring positions z1 and z2 determined during the pre-caustic
measurement are displayed here.

Options in the Device control > Settings tab of the Beam pointing measuring mode

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MSM+ HB

Configure advanced settings

1.

Click on the Advanced tab.

2.

Maintain the options according to the
explanations in the following table..

OptionExplanation

Save device settings

All options marked with an asterisk in the Device control menu can besaved in the EEPROM of the device.
These and other options for saving / loading configurations are described in chapter 9.4.4 on page 53.

# Pixel in x/y *This option enables setting the resolution of the CCD sensor:
X Enter the number of pixels in the x-direction / y-direction in the input
field on the left / right.

Low power mode

We recommend enabling this option for relatively low power laser
beams.
If this option is enabled, the following initial values are selected during
beam search• Filter level of the filter wheel: 0 (instead of 1 otherwise)• Integration time: 10 ms (instead of 1 ms otherwise).
X

Set the check mark to enable the option.

Locked area

Locked area means a restriction of the traversing range in the z-direction. The lower limit of the enabled traversing range is always home
position. The upper limit can be set freely.

Maximum z-Position in mm *1.
X
X

Use one of the following options to set the locked area:
Enter the upper limit of the permitted z-traversing range in the input
field.
Use the slider below the input field.

We recommend saving a locked area in the device, if it is safety-relevant:
2. If you want to save the locked area (and the other options marked
with an asterisk) in the device, click the Save device settings button.
x The settings are retained even if the device is switched off or disconnected from the power source.

Tab. 9.12:

86

Options in the Device control > Advanced tab of the Beam pointing measuring mode

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Measure beam pointing stability

DANGER
Serious eye or skin injury due to laser radiation
X Observe the warning messages in chapter 9.1 on page 44.
Starting measurement1.

Switch on the laser.

2.

Enter z-position.

3. Click the Start button.
x The measurement begins.
During the measurement, the progress is shown in the following indicators:

Pre-caustic
While the indicator is rotating, the z1 andz2 positions along the beam propagation
are identified. The positions are optimized
according to Primes quality criteria.
After successful pre-caustic
measurement, the indicator lights up
green.
The process is visualized in the Falsecolor Image tool.

Measuring beam pointing
While the indicator is rotating, the beam
center and the angle are constantly determined.
The determined measuring points
are displayed in the coordinates of
the Beam Pointing Stability tool.
The current position of the beam ismarked with a large X, previous positions are marked with a small x.

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Completing measurement
When the beam pointing
measurement is completed, theindicator Beam Pointing changes togreen.
1.

Click on the Stop button.

2.

Switch off the laser.

You can reset the measured values in the
Position and Angle windows by pressing
the Reset button.

9.10

Fiber mode measurement

The measuring mode Fiber mode is - apart from one difference - identical to the measuring mode Manual
caustic (see Chapter “9.7 Manual caustic measurement” on page 73).
The difference is that the axes are locked in the x and y direction, i.e. they cannot be moved.
In this mode, it is shown below the green start button that the axes are locked.
This measuring mode is available only for the MSM+ HB10. With the MSM + HB20, the movement in the x
and y directions is always blocked.
Select this measuring mode instead of the Manual caustic measuring mode if you have installed a fiber
bridge. Without locking the axes, damage to the fiber or the fiber holder can occur.

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10

Troubleshooting

10.1

Error during a measurement35,0(6

The following problems may occur during a measurement:• an error during data transfer,• a processor in the measuring system failed or• there was an error during program execution.
Turn the device off and on.
If necessary, restart the computer.

NoticeDamaging/destroying the device
If the power supply of the MSM+ HB is disconnected and connected again, the device readjusts itself. This may cause the laser to destroy the device.
X Always switch off the laser before restarting the MSM+ HB.

10.2

No measurement signal at the MSM+ HB

If, apart from a noise level - with the MSM+ HB typically approx. 270 - 300 cts. - no measurement signal canbe detected, check the device position. It may be helpful to use the alignment objective.
In addition to incorrect positioning, an attenuation that is selected too high can also lead to such a case.

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Maintenance and service

11.1

Maintenance intervals

MSM+ HB

The operator is responsible for determining the maintenance intervals for the measuring device.
PRIMES recommends a maintenance interval of 12 months for inspection and validation.
If the device is used only sporadically, the maintenance interval can be extended up to 24 months.
Please note that the safety and warning functions of the device must be checked regularly.

11.2

Cleaning the device surface

You can remove light contamination with compressed air. Make sure that all device openings are closed.
For further cleaning, PRIMES recommends a mixture of distilled water and isopropanol in a ratio of approx.
5:1. Use lint-free cleaning cloths that do not scratch. This can be e.g. microfiber cloths or paper towels fromthe cosmetics sector.
If these steps are not sufficient, please contact PRIMES or your PRIMES distributor.

11.3

Spare parts

The following parts of the HighBrillance measuring objective can be cleaned or replaced during maintenance:••••

Cyclone with alignment tool (order nr.: 801-007-008)
Protective window in front of the power output opening (order nr.: 801-001-023)
Beam splitter in the measuring objective (order nr.: 670-002-021)
Optics tube (order nr.: 500-000-013)

Only use original PRIMES spare parts!

11.4

Exchange wear parts

Since the aperture at the beam inlet is directly accessible, it can be changed without any further preparatory
measures.
To change the protective glass or the mirror, the measuring objective must be removed first.
The measuring objective is a high-quality, very sensitive component. Consult PRIMES before disassembling
the measuring objective.
Dismantling of the measuring objective has to be carried out by a qualified person. The disassembly must be
carried out in a clean room.
Always observe the following warning message

NOTICE
Damaging/destroying the device
Contamination and fingerprints on the protective window / mirror can lead to damage orshattering or splintering of the protective window during measuring operation.
X Only replace the protective window in a dust-free environment.
X When exchanging the protective window wear powder-free latex gloves.
11.4.1
1.
2.
3.
4.
5.
6.

90

Demount the measuring objective

Turn off the voltage supply.
Turn off the cooling water.
Mount the inlet aperture cover at the beam entrance aperture.
Turn off the compressed air supply.
Disconnect the cooling water pipes at the quick connect couplings.
Seal cooling water pipes.

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7. Remove compressed air hose from the connection for the housing flushing.
8. Remove the fastening screws (see Fig. 11.2 on page 91).
9. Remove measuring objective
10. Dry and clean the measuring objective.

Beam Entrance

Measuring Output
Fig. 11.1:

Laser Output

Openings of the measuring objective (foto shows MSM+ HB10)

S1, S2The objective is fastened at the device bymeans of three screws. The two screws
S1 and S2 (M3x16, AF 2.5 mm) are required for the fastening of the objective on
the device surface.
Another screw S3 (M5 x 15, AF 4 mm)
fastens the upright of the device laterally.

S3

Fig. 11.2:

Screws to fasten the objective

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MSM+ HB

Exchange protective window in front of the power output aperture

Observe the warning messages above.
Keep the protective window free from contaminations.
Do not touch the plane surface of the protective window when putting it in!

The protective window protects the optical elements behind it from contaminations. A polluted protective window does not affect the function of the measuring objective. However, the increased scattering of
the laser light leads to a heating up of the protective window and the housing which can finally result in thedestruction of the protective window itself. This can damage sensitive optical components in the measuring
objective. Therefore, a contaminated protective window has to be exchanged immediately.
Components:
1. Protective window retainer
2. Protective window
3. Ring nut
4. O-ring 60.08 x 1.78
5. Nut for O-ring (4)6. Optics tube

1

5
6
4
3
2

1. Carefully remove the protective window retainer (1).
2. Check O-ring (4) in the nut (5) for damages and a tightfit. If necessary, it has to be replaced.
3. Remove the ring nut (3) from the protective window
retainer by means of the screw-in tools.
4. Take the protective window (2) out of the protective
window retainer and replace it by a new protective
window.
5. Screw the ring nut back in the protective window
retainer.
6. Position the protective window retainer back on the
optics tube.

1

Fig. 11.3:

92

Change of the protective glass in front of the power output opening (on a 10 kW unit)

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11.4.3

Exchange beam splitter

Observe the warning messages at the beginning of this chapter.

1

2
3

4
6

5

Fig. 11.4:

Components:
1. Cylinder pin ISO 2338 m6 4x12
2. Beam splitter
3. Labeling “Arrow” has to point downwards.
4. Optics tube
5. Coupling ring
6. Drilling
1. Remove protective window retainer, see previous
chapter.
2. Remove coupling ring (5).
3. Pull optics tube (4) out of the housing.
4. Remove the beam splitter (2).
5. Clean the beam splitter thoroughly. A new beam splitter has to be cleaned before it can be built in as well.
6. Turn the beam splitter until the arrow (3) on its side
points downwards, see figure.
7. Put in the beam splitter carefully.
8. Push the optics tube back into the housing. The pin (1)has to be pushed into the drilling (6).
9. Screw the coupling ring on manually.
10. Check the protective window in the protective window
retainer for contaminations. If necessary, it has to be
replaced (see the previous chapter).
11. Mount the protective window retainer.

Exchanging beam splitter

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MSM+ HB

Change aperture at the beam entrance

Observe the warning messages above

1
2
3
4

Required tools:
Allen wrench, SW 3
Components:
1 Cylinder head screw ISO 4762 M4x10
2 Aperture
3 O-ring 21,95 x 1,78
4 Centering ring (option)
1. Unscrew two cylinder head screws (1) with spring lockwasher and washer.
2. Remove the aperture (2) .
3. Check O-ring (3) for damage and replace if necessary.
Important!
The mounting holes in the aperture have a tolerance tocenter the aperture. A centering ring (4) can be used as apositioning aid.
4. Put on the new aperture with O-ring and center it.
5. Fasten aperture with two cylinder head screws (1)Fig. 11.5:

12

Changing the aperture at the beam entrance

Measures for the product disposal

As a B2B device, this PRIMES measuring device is subject to the European Waste Electrical and Electronic
Equipment (WEEE) Directive and the corresponding national laws. The WEEE directive obliges the operatingcompany to dispose of the device in an environmentally sound manner, not with household waste, but in a
separate WEEE collection.
PRIMES gives you the opportunity to return your PRIMES measuring device for free disposal within thescope of the Waste of Electrical and Electronic Equipment (WEEE Directive). This service does not include
shipping costs. You can send PRIMES measuring devices to be disposed of within the EU to our address:
PRIMES GmbH
Max-Planck-Str. 264319 Pfungstadt
Germany
If you are located outside the EU, please contact your local PRIMES distributor to discuss the disposal procedure for your PRIMES measuring device.
PRIMES is a registered manufacturer in the German “Used Appliances Register“ stiftung elektro-altgeräte
register (stiftung ear). Our number is: WEEE-reg.-no. DE65549202.

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35,0(6

Declaration of conformity

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MSM+ HB

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14

Technical data
MSM+ HB10

MSM+ HB20

5 kW
10 kW

10 kW
20 kW

Characteristics Measurement

Max. medium power
Singlemode
Multimode
Beam diameter
Wavelength range

20 µm - 1000 µm
1000 nm - 1100 nm

Admissible wavelength range of the laser
light
Admissible measuring range
Design wavelength
Magnification (using MO)
Max. input-NA
Max. energy density on the 1. opticalsurface at 10 ns
Max. energy density on the 1. opticalsurface (cw-mode)
Max. traverse range
Max. trav. range with fiber bridge/QBH
Max. trav. range with fiber bridge/HLC-16
Max. trav. range with fiber bridge/LLK-D

1025 nm - 1080 nm± 3zR
1064 nm4,5
0.11
on request
on request
120 mm
106 mm
118 mm
120 mm

40 mm
26 mm
38 mm
40 mm

Supply data
Supply voltage, DC
Max. current consumption
in standby mode
Recommended cooling water flow rate
Min. cooling water flow rate
Cooling water temperature Tin
Maximum water inlet pressure
Hose diameter
Compressed Air Pressure
Maximum Pressure
Specification of compressed air
Hose diameter

24 V ± 5 %
1.8 A
0.4 A
0.7 l/min/kW
5 l/min10 l/mindew-point temperature < Tin < 30 °C
4 bar
12 mm

16 mm

0.5 bar - 1.0 bar
2 bar
ISO 8573-1: 2010 [6:4:4]
6 mm

Communication
Ethernet
Safety circuit (Interlock)

100 Mbit/s

Measures and weight
L x W x H (without cables and plugs)
Weight, approx.

600 x 401 x 388
35 kg

727 x 400 x 385
42 kg

Environmental conditions
Service temperature range
Storage temperature range
Reference temperature
Admissible relative air humidity (noncondensing)

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Dimensions

15.1

Dimensions of the MSM+ HB10

MSM+ HBA

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Dimensions of the MSM+ HB10 (continued)
View A

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MSM+ HB

Dimensions of the MSM+ HB10 with fibre bridge

A

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Dimensions of the MSM+ HB10 with fibre bridge (continued)
View A

B

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Dimensions of the MSM+ HB with fibre bridge (continued)

View B

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15.3

35,0(6

Dimensions of the MSM+ HB20 (at zmax)

C

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Dimensions of the MSM+ HB20, continued)
View C

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15.4

35,0(6

Dimensions of the MSM+ HB20 with fibre bridge (at zmax)

D

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Dimensions of the MSM+ HB20 with fibre bridge (continued)

View D

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16

Appendix

16.1

Appendix A: GNU GPL license notice

The software of this product contains software code that is licensed subject to the GNU General Public
License (GPL) Version 2 or later. The license terms of the GNU GPL Version 2 or later are available on thefollowing websites:• https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html• https://www.gnu.org/licenses/licenses.en.html

16.2

Appendix B: Using a PLM for power measurement

The PowerLossMonitor PLM is a system that determines power losses within water-cooled optical systems.
The PLM measures the flow rate as well as the temperature increase of the cooling water between inlet andoutlet. Based on this data, the absorbed power is calculated.
16.2.1

Cooling water connection

Water out

Water inFig. 16.1:

Water connection (Figure shows PLM with MSM+ HB10)

The PowerLossMonitor PLM measures the laser power absorbed within the water-cooled absorbers of the
MSM+ HB. As the PLM is calibrated along with the MSM+HB including all connecting hoses, using the provided hose during measurement is mendatory.
Connect the water supply acording to Fig. 16.1:

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1. Connect water in to PLM.
2. Connect water out at PLM to water in at MSM+ HB, using the supplied hose.
3. Connect water out at MSM+ HB to cooling.
In the case of an MSM+ HB10, the temperature sensor embedded in a T-adapter must be installed between the MSM+ output and the chiller.
The lengths of the hose has an influence on the time constants of the measuring device. Only use
the hose supplied!
16.2.2

Electrical connections

Connect USB
Connect the USB port of the PLM to the PC or network using the supplied USB-cable.
Connect temperature sensor• MSM+ HB10:
Install the temperature sensor, which is integrated within a T-adapter, between the MSM+ output and thechiller• MSM+ HB20:
Connect the permanently mounted temperature sensor cable (black cable on the water return of the
MSM+ HB20) to the PowerLossMonitor PLM
Connect interlock
Connect the interlock of the PowerLossMonitor PLM to the Safety-Circuit-PLM-In of the MSM+ HB. For thispurpose, use the enclosed 8-pin cable which is pre-assembled on both sides.
16.2.3

Transport or storage of the PowerLossMonitor PLM

The cooling circuit of the PLM must be drained completely before transport or storage. Temperatures close
to or below freezing point can lead to damages due to the formation of ice, if the cooling circuit is not completely drained.

NOTICE
Damage of the turbine
The turbine is not designated for high rotational speed.
X Do not use compressed air to drain the cooling circuit of PLM.
Unlike the MSM+ HB, the cooling circuit of the PLM is not allowed to be drained with compressed air.
1. Remove cooling circuit hoses.

Cooling circuit connectors

2. Drain the cooling circuit completely.
3. Seal the connectors of the cooling circuit using the enclosed plugs.

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16.2.435,0(6

Measurement with PLM

Observe the sequence when setting up the connection with the LaserDiagnostics software LDS.
Only then the LDS integrates the results of the power measurement into the results of the MSM+ HB measurement. This means that the actual power is stored to every single plane.
Otherwise, the LDS considers the two devices as two completely independent devices.
1.

Start the LDS
The start screen appears.

2.

Select the Measure operating mode.

The Connections window appears.
3.

First click on the power meter.

4.

Click on the button Connect todevice.

5.

Then click on the MSM+ HB.

6.

Click on the button Connect todevice again.

Start the cooling approx. 2 minutes before the start of the measurement and stop it approx. 1 minute after
the end of the measurement operation.
Only cool the device during measurement operation. The number of operating hours has an impact on theservice life of the turbine in the PowerLossMonitor PLM.

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16.3

Appendix C: Measuring pulsed irradiation

16.3.1

Trigger operation

The dynamic range of the CCD sensor in the camera housing is extended by means of a variable integration
time control. The integration time can be freely determined in the range between 6 µs and 225 ms, or it canbe set automatically (for this purpose, activate the Autom. exposure option in the Settings tab of the Single
planes measuring mode.
If the automatic exposure is enabled, then the software will automatically – using a series of pre-measurements – set the integration time at which the output signal of a pixel in the array is too high. The optimal
integration time will then be a little below that.
By means of the variable integration time control, not only cw laser beams but also a multitude of pulsed
beams can be measured in quasi-cw operation. An exception are, for example, laser beams with a very
low pulse frequency. For measuring such beams, the trigger operation is available in the measuring modes
Single planes / Manual caustic / Automatic caustic. If this is enabled, the device only measures within defined time periods. The laser pulse or the corresponding trigger signal marks the beginning of such a period
and the (freely adjustable) integration time marks its end.
Fig. 16.2 shows that in addition to the trigger signal and the integration time, a further variable intervenes inthe sequential control of the CCD sensor: the trigger delay. It indicates the time period between the trigger
signal and the start of the integration time.

Trigger

Delay time

Sequential -control camera

Triggerlevel
Fig. 16.2:

Integration time

Options for affecting the sequence control of the CCD sensor

A measurement can be triggered internally or externally. Internal signals are triggered by the photodiode integrated in the device. Externally triggered signals enter the device via a BNC socket. You can freely determine
the threshold value of the internal trigger signal (trigger level).
Every measurement consists of a dark measurement and a measurement with photo transfer. This applies
for trigger operation as well as cw / quasi-cw operation. This means that each measurement requires at least
two trigger signals.
The following time constants apply:
Timeout:		
Minimum integration time:
Maximum integration time:
Minimum delay: 			
Maximum delay: 		110

2 sec (Standard)
6 µs
225 ms12 µs
400 ms

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16.3.2

Measuring configuration selection

There are various measuring options to differentiate between:
•
•
•
•
•

Measuring a single plane or a caustic
Measuring a complete pulse or just a single section
Measuring with freely adjustable integration time or with automatic integration time control
Measuring in trigger operation or quasi-cw operation
Variations of optimal integration time caused by changing the attenuation

Combining these measurement options with the following pulse parameters provides numerous possibilities:•

Pulse duration: fs – ms•

Pulse frequency: 1 Hz – 1 kHz

The following merely describes a rough structure that is intended to help in choosing measuring settings.
16.3.3

Influence of the pulse parameters on the integration time control

The software-operated integration time control always assumes that there is a cw laser beam.
This may cause quantization of the integration time for slow pulse lasers (< 500 Hz) or lasers with high pulse
energy (integration time very short). Tab. 16.1 And the diagram in Fig. 16.3 on page 112 illustrates this.
Pulse frequency

Number of detected pulses

in Hz

at maximum integration time 225 ms

at integration time 1 ms

1

0

0–1

5

1

0–1

10

2

0–1

50

11

0–1

100

22

0–1

200

45

0–1

500

112

0–1

1 000

225

1–2

2 000

450

2–3

5 000

1 125

5.00

10 000

2 250

10.00

Tab. 16.1:

Number of detected pulses in correlation with the integration time and pulse frequency

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n-1 pulses

MSM+ HB

Pulse frequency in Hz
Fig. 16.3:

Percentage of change in the detected energy when exactly one pulse is left out, in correlation with the pulse
frequency

Tab. 16.1 shows the number of detected pulses during the maximum integration time and during an integration time of 1 ms for different pulse frequencies. Quantization with low pulse frequencies is clearly illustrated
in the column for the maximum integration time. While 2 250 pulses are detected at a pulse frequency of
10 kHz, at 10 Hz there is only one or no more than two.
If the signal level is too high during a measurement at 10 Hz pulse frequency and the software tries to adjust
the integration time, there are only three possible results. The energy application for a measurement remains
the same, it decreases by 50 %, or it drops to zero. These increments are less significant at a pulse frequency of 10 kHz. This correlation is shown in general terms in Fig. 16.3 on page 112. It can be seen that from apulse frequency of 500 Hz, the minimum jump with a reduction of the integration time is 1 %.
Small pulse frequencies aren’t the only thing that will cause quantization though. If the pulse energy is very
high and it isn’t possible to further increase the attenuation, the integration times will be smaller. In Tab. 16.1,
an integration time of 1 ms is added to the maximum integration time. In this case, a pulse frequency of
500 Hz is not sufficient in order to quasi continuously control the energy application for each measurement
through integration time control.
A total of four states can always be differentiated on the way from low to high pulse frequencies or from short
to long integration times. This is demonstrated by the following example for measuring pulsed irradiation
during quasi-cw operation.

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I in W/cm²∆t in μs
Fig. 16.4:






t in μs

Measuring with different integration times

12 – 200 µs:
200 – 400 µs:
200 – 2 ms:
2 – 200 ms:

Sporadic measuring of pulses
1 pulseQuantization noise cause by a varied number of pulses
Virtually continual integration time control

Fig. 16.4 shows pulsed irradiation. The pulse pauses are 200 µs. The required integration time of the sensor
correlates directly with the intensity of the laser beam.
If it is smaller than the pulse pause as in case 1, statistically there is a maximum of 1 pulse in themeasurement. The probability that a pulse is present during each measurement for integration time control
as well as during the actual measurement is low.
If the optimal integration time falls exactly between the simple and double duration of the pulse pause, there
will always be just one pulse in each measurement (case 2). This is the perfect state for measuring on one
plane. The caustic can also be measured with this setup. Here it is important to make sure that the signal saturation for the measurement in the focus is as high as possible. Only then is it possible to ensure that there
is a sufficient S/N ratio when measuring a plane far outside of the focus.
Case 3 describes the case in which the integration time ranges between the single and tenfold duration of
the pulse pause. Within this range, every pulse is more or less noticeable as a clear signal jump during the
integration time. Integration time control is only possible with quantization. The measuring results often havea bad S/N ratio or the signal level is too high.
If the integration time increases even more, the signal jumps become flatter. Integration time control operates
quasi continuously (case 4). The laser being measured can now be measured as a cw laser.
The neutral-density filters, which can be inserted into the optical path, make it possible to always work within
the desired range 1 to 4.
In addition, trigger operation is available for the device. Together with the integration time control and a delay
time control, measurements can also be made reliably in case 1.
These four cases can generally be sorted into two groups. Case 1 and 2 must be measured in trigger operation. Case 4, however, is best measured in quasi-cw operation. Case 3 should be avoided altogether bychoosing a suitable filter.
The diagram in Fig. 16.5 shows a classification of laser beams to be measured with regard to the suitable
operation mode.

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Pulse frequency
1 MHz
100 kHzcw operation

10 kHz
1 kHz

Quasi-cw operation

100 HzTrigger operation

10 Hz
1 Hz
1 μs
Fig. 16.5:

10 μs

100 μs

1s

10 s

100 s

Pulse duration

Selection of the appropriate measurement mode based on laser parameters

For the blue field laser beams, the quasi-cw operation is most suitable. However, be aware that as thepulse frequency decreases, the required integration time increases to ensure the quasi-cw case. As a ruleof thumb, the integration time of a focal plane measurement should be approximately the same as the timefor 35 pulses. If the laser beam to be measured falls below a pulse frequency of approx. 500 Hz, you shouldswitch to trigger operation.
While it is almost always possible to measure with the integration time control in the cw or quasi-cw operation, it only makes sense to use it for very long pulse durations (>1 ms) in trigger operation. With the helpof the attenuation filters, the integration time is adjusted in such a way that it is only a fraction of the pulse
duration. The trigger signal will then merely specify to the device the starting time for the measurement. The
integration time may increase or decrease during the course of the caustic measurement without leaving thepulse path (see Fig. 16.6 and “Example 2: very long pulse duration” on page 115).
P Lasermin Delay (12 μs)
Fig. 16.6:

tp – 1 ms

Integrationszeit
Integration
time (e. g. 100 μs)t

Measuring parameters for pulsed laser systems with pulse duration greater than 1 ms

For all other cases, it is advisable to specify a fixed integration time in order to always measure a fixed number of pulses by cleverly selecting the filters and the delay and integration time (“Example 1: fixed integrationtime” on page 115).

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16.3.4

Examples for trigger operation

Example 1: fixed integration time
With these settings, the device detects the second laser pulse after the trigger is released. Depending on
how precisely it can be triggered, the integration time can also be varied.
Laser parameter

Device settings

Pulse duration:

50 ns

Delay:

950 µsPulse frequency:

1 kHz

Integration time:

100 µsTrigger channel:

external trigger signal

Example 2: very long pulse duration
In this example, the first 12 µs of the laser pulse are not measured.
Laser parameter
Pulse duration:

16.3.5

Device settings
1 ms

Delay:

12 µs

Integration time:

1 ms

Trigger channel:

internal trigger signal

Summary

If the laser is pulsing at a high frequency (> 500 Hz) or if the pulses last a long time (> 1ms), it is best to measure with the automatic integration time control. This makes it possible to vary or optimize the integration
time during a caustic measurement.
For the long pulse duration, choose the attenuation so that the integration time is smaller than the pulse
duration even outside of the focal point.
When the pulse frequency is very high, however, the attenuation must be chosen so that enough laser pulses
are integrated during the measuring cycle. If too few pulses occur during an integration time, the number ofphotoelectrons will change too much with each pulse. The regulating routines of the LaserDiagnosticsSoftware LDS will then lead to measurements with signal levels that are statistically too high.
It is important to make sure that the integration time is never shorter than the pulse pauses. If this is thecase, it will no longer be possible to perform an untriggered measurement properly with the device.
So it sometimes makes sense to set the attenuation so that exactly one pulse is enough to expose thesensor at the focal point. You can then measure a caustic with a fixed delay and an integration time set when
the focus was measured. The dynamic of the CCD sensor is sufficient to measure the entire caustic with anacceptable S/N ratio.

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