35,0(6Operating Manual
Translation of the original instructions

LaserQualityMonitor LQM+
LQM+ 20, LQM+ 200/500, LQM+ HP (10/20 kW)
LaserDiagnosticsSoftware LDS

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IMPORTANT!
READ CAREFULLY BEFORE USE.
KEEP FOR FUTURE USE.

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Table of contents
1

Basic safety instructions

7

2

Symbol explanations

93

About this operating manual

104Conditions at the installation site

105

Introduction

10

5.1
5.2
5.3

System description..................................................................................................................10
Measuring principle .................................................................................................................12
Short overview installation........................................................................................................13

6

Transport

14

7Installation

14

7.1
7.2

7.3

8

Connect cooling circuit (LQM+ HP and LQM+ 500 only)
8.1
8.2
8.3
8.4

9

Preparation and installation position.........................................................................................14
Manually aligning the LaserQualityMonitor LQM+.....................................................................15
7.2.1
Alignment tool............................................................................................................15
7.2.2
Manual alignment of the LQM+ 20 basic device and the LQM+ 200/500 with
1st attenuator.............................................................................................................15
7.2.3
Fine adjustment at the 1st attenuator..........................................................................16
Install the LaserQualityMonitor LQM+.......................................................................................17
7.3.1
Install the LQM+ 20/200/500 without bottom plate....................................................17
7.3.2
Install the LQM+ 200/500 with bottom plate..............................................................18
7.3.3
Install the LQM+ HP with bottom plate.......................................................................19
Water quality............................................................................................................................20
Water pressure.........................................................................................................................20
Humidity...................................................................................................................................21
Water connections and water flow rate.....................................................................................22
8.4.1
LQM+ HP (10 kW and 20 kW)....................................................................................22
8.4.2
LQM+ 500.................................................................................................................22
8.4.3
Remove the sealing plugs of the water connections...................................................23

Electrical connection
9.1
9.2

9.3

9.4

20

24

Connections.............................................................................................................................24
Pin assignment........................................................................................................................25
9.2.1
Power supply............................................................................................................25
9.2.2
Inlet external trigger...................................................................................................25
9.2.3
Outlet internal trigger..................................................................................................25
Safety facilities.........................................................................................................................26
9.3.1
Monitoring side access to the measuring objective and neutral-density filters.............26
9.3.2
Temperature control...................................................................................................26
9.3.3
Safety interlock..........................................................................................................27
Connection to the PC and connect power supply....................................................................28

10

Status display

29

11

Measurement30

11.1 Safety instructions....................................................................................................................30
11.2 Selection and change of the measuring objective and the neutral density filter.........................31
11.2.1 Selection of the measuring objective..........................................................................31
11.2.2 Exchanging the measuring objective or the neutral density filter.................................32
11.2.3 Neutral density filter...................................................................................................33

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35,0(611.3 Connect the LaserQualityMonitor LQM+ with the LaserDiagnosticsSoftware LDS....................34
11.3.1 Connect device..........................................................................................................34
11.3.2 Change the network address of a connected device..................................................34
11.4 Set up the LaserQualityMonitor LQM+ with the LaserDiagnosticsSoftware LDS.......................35
11.4.1 Choose the beam pointing function...........................................................................35
11.4.2 Start beam search.....................................................................................................36
11.4.3 Log beam pointing stability........................................................................................38
11.4.4 If the laser beam is not found.....................................................................................39
11.5 Perform an automatic caustic measurement............................................................................40
11.5.1 Choose automatic caustic measurement mode.........................................................40
11.5.2 Configure settings (Device control > Settings).........................................................41
11.5.3 Configure advanced settings (Device control > Advanced)......................................41
11.5.4 Starting an automatic caustic measurement...............................................................42
11.5.5 Measurement results display......................................................................................42
11.6 Perform power measurement...................................................................................................43
11.6.1 Choose power measurement mode...........................................................................43
11.6.2 Configure settings (Device control)...........................................................................44
11.6.3 Starting a power measurement..................................................................................44
11.6.4 Measurement results display......................................................................................45
12

Troubleshooting

46

13

Maintenance and service

47

14

Storage

47

15

Measures for the product disposal

47

16

Declaration of conformity

48

17

Technical data

49

18

Dimensions

50

18.1 LQM+ 20.................................................................................................................................50
18.2 LQM+ 200/500 (without bottom plate).....................................................................................51
18.3 LQM+ HP.................................................................................................................................52
19

Appendix

53

19.1 Changing the factory setting on the LQM+ 20/200UV..............................................................53
19.2 HighYAG collimation module up to 6 kW..................................................................................55
19.2.1 Key data for the cooling system for the HighYAG collimation module.........................56
19.2.2 Schematic of the cooling system for the HighYAG collimation module........................56
19.2.3 Remove/Install the HighYAG collimation module........................................................57
19.2.4 Choosing the measuring objective with a HighYAG collimation module installed.........58
19.3 IPG collimation module up to 20 kW........................................................................................60
19.3.1 Possible combinations of the LaserQualityMonitor LQM+ HP (20 kW) with IPG
collimators.................................................................................................................61
19.3.2 The use of the measuring objectives 1:1 and 5:1.......................................................62
19.3.3 Maximum Power........................................................................................................62
19.4 Optical path in LQM+ HP (with IPG Collimator).........................................................................63
20

Formula and algorithms for raw beam back calulation

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PRIMES - 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

PRIMES is responsible for both the development, production, and calibration of the measuring devices. Thisguarantees optimum quality, excellent service, and a short reaction time, providing the basis for us to meet allof our customers’ 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 instructions

Intended use
The LaserQualityMonitor LQM+ is exclusively intended for measurements which are carried out in or nearby
the optical path of high power lasers. Please mind and adhere to the specifications and limit values given inchapter 17 „Technical data“ on page 49. Other forms of usage are improper. The information contained inthis operating manual must be strictly observed to ensure proper use of the device.
Using the device for unspecified use is strictly prohibited by the manufacturer. By usage other than intended
the device can be damaged or destroyed. This poses an increased health hazard up to fatal injuries. When
operating the device, it must be ensured that there are no potential hazards to human health.
The device itself does not emit any laser radiation. During the measurement, however, the laser beam isguided onto the device which causes reflected radiation (laser class 4). That is why the applying safety regulations are to be observed and necessary protective measures need to be taken.
In measuring mode, the laser control’s safety interlock must be connected with the device.
Observing applicable safety regulations
Please observe valid national and international safety regulations as stipulated in ISO/CEN/TR standards aswell as in the IEC-60825-1 regulation, in ANSI Z 136 “Laser Safety Standards” and ANSI Z 136.1 “Safe Useof Lasers”, published by the American National Standards Institute, and additional publications, such as the“Laser Safety Basics”, the “LIA Laser Safety Guide”, the “Guide for the Selection of Laser Eye Protection”
and the “Laser Safety Bulletin”, published by the Laser Institute of America, as well as the “Guide of Controlof Laser Hazards” by ACGIH.
Necessary safety measures

DANGER
Serious eye or skin injury due to laser radiation
During the measurement the laser beam is guided on the device, which causes scattered or
directed reflection of the laser beam (laser class 4).
The LaserQualityMonitor LQM+ cannot be operated in any of the available configurations
without taking the following precautions. All precautions must be taken, even when the fiber
is in the collimator or fiber adapter.
X Please take the following precautions.
If people are present within the danger zone of visible or invisible laser radiation, for example near laser
systems that are only partly covered, open beam guidance systems, or laser processing areas, the following
safety measures must be implemented:
•
•
•
•
•
•

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.
Please wear safety goggles adapted to the power, power density, laser wave length and operating
mode of the laser beam source in use.
Depending on the laser source, it may be necessary to wear suitable protective clothing or protective
gloves.
Protect yourself from direct laser radiation, scattered radiation, and beams generated from laser radiation(by using appropriate shielding walls, for example, or by weakening the radiation to a harmless level).
Use beam guidance or beam absorber elements that do not emit any hazardous substances when theycome in to contact with laser radiation and that can withstand the beam sufficiently.
Install safety switches and/or emergency safety mechanisms that enable immediate closure of the laser
shutter.

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Ensure that the device is mounted securely to prevent any movement of the device relative to the beamaxis and thus reduce the risk of scattered radiation. This in the only way to ensure optimum performance
during the measurement.

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 must not be modified, neither constructionally nor safety-related, without our explicit permission.
The device must not be opened e.g. to carry out unauthorized repairs. Modifications of any kind will result in
the exclusion of our liability for resulting damages.
Liability disclaimer
The manufacturer and the distributor of the measuring devices do not claim liability for damages or injuries
of any kind resulting from an improper use or handling of the devices or the associated software. Neither the
manufacturer nor the distributor can be held liable by the buyer or the user for damages to people, material
or financial losses due to a direct or indirect use of the measuring devices.

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Symbol explanations

The following symbols and signal words indicate possible residual risks:

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.

The following symbols indicating requirements and possible dangers are used on the device:

Components susceptible to ESD

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

Further symbols that are not safety-related:
Here you can find useful information and helpful tips.

With the CE designation, the manufacturer guarantees that its product meets the requirements of
the relevant EC guidelines.
X Call for action

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LaserQualityMonitor LQM+

About this operating manualThis documentation describes the installation and configuration of the LaserQualityMonitor LQM+ and theexecution of measurements with the LaserDiagnosticsSoftware LDS.
The LaserDiagnosticsSoftware LDS must be installed on the PC for measuring operation of the LaserQualityMonitor LQM+. The basic version of the LaserDiagnosticsSoftware LDS is included in the scope of delivery
for the device.
For a detailed description of the software installation, file management and evaluation of the measured data,
please refer to the separate operating manual LaserDiagnosticsSoftware LDS.

4
•
•
•
•

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.

5

Introduction

5.1

System description

The LaserQualityMonitor LQM+ is used to measure the beam properties of a beam source either by measuring the open beam across several meters or with a fiber placed in a fiber holder or collimator.
Cw lasers can be measured and pulsed lasers can also be measured using an internal trigger.
The electronics and all optical components shown are installed in the LQM+ 20 basic device. The LQM+ 20
basic device can be supplemented by a front-end module with a beam splitter, an absorber and an alignment unit, which enables the use of the device even in the multikilowatt range. Fiber retainers, collimators,
neutral density filters as well as additional measuring objectives are available upon request.
The laser power can also be measured with the integrated power meters in the 1st and 2nd attenuator (only
LQM+ 500 and LQM+ HP).

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Fig. 5.1:

35,0(6Components of the LQM+ 20 basic device

1st Attenuator

Alignment unit
Power meter(LQM+ 500 only)
Fig. 5.2:

Components of the LQM+ 200/500

1st Attenuator

Absorber withpower meter

Alignment unit

2nd Attenuator with beam splitter

Fig. 5.3:

Components of the LQM+ HP (10/20 kW)

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LaserQualityMonitor LQM+

Measuring principle

Due to the very long measuring path of three to six Rayleigh lengths, a lot of measuring is needed to characterize a collimated laser beam. The LaserQualityMonitor LQM+ therefore generates a compact caustic
inside the device by focusing the irradiated collimated laser beam with a focussing optic. In the process, thefocused beam is weakened as it passes through an integrated prisms and OD filter and then appears on the
CCD sensor, enlarged by a measuring objective.
The LaserDiagnosticsSoftware LDS software determines the radius, location, and orientation of the laser
beam by moving the prisms inside the device and measuring the two-dimensional power density distribution
repeatedly at various positions. The electronic integration time control of the CCD sensor expands the system’s dynamic area. As a result of this, it generally isn’t necessary to adjust the filter during a measurement.
The following laser sources can be measured:••All cw and pulsed laser sources in the wave length area of 340 – 360 nm/515 – 545 nm/1 030 –1 090 nm with medium power from approx. 1 mW up to multikilowatt ranges with an M² ranging from 1
to approx. 50.
The beam diameter at the aperture of the measuring system can vary in the range of 1.5 mm to 15 mm(22 mm only for LQM+ HP 20 kW), with divergence below 10 mrad.
Laser beam

Focusing optic

PrismsAbsorberPrismsTrigger
Measuring objective 5:1
Position 1(illustrated inserted)
Fig. 5.4:

Focusing optic

12

OD filter

CCD sensor

Optical assembly of the LQM+ 20 basic device

Raw beam

Fig. 5.5:

Measuring objective 1:1
Position 2(illustrated not inserted)

Scaning range

CCD sensor

Measuring objective

Measuring Principle

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5.3

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Short overview installation

1.

Installing the LaserDiagnosticsSoftware LDS on the computer•

Software is part of the scope of delivery

See separate Operating
Manual of the LaserDiagnosticsSoftware LDS

2.

Taking safety precautions

Chapter 1 on page 7

3.

Prepare Installation (only during open beam measurement)

Chapter 7 on page 14•

Make preparations•

Set the installation position•

Align the device manually

4.

Connect the water-cooling (LQM+ HP and LQM+ 500 only)•

Connection diameter•

Observe flow rate

5.

Power supply•

Connect power supply•

Connect safety interlock

6.

Connection with the computer•

Via Ethernet or LAN

7.

Complete Installation (only during open beam measurement)•

Align the device with the LaserDiagnosticsSoftware LDS according tochapter 11.4 on page 35.

•

Mount the device firmly in accordance with chapter 7 on page 14

8.

Measure•Follow the safety instructions•

Select and use the measuring objective and neutral-density filter•

Check the device‘s alignment with the LaserDiagnosticsSoftware LDS•

Perform a test measurement

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Chapter 8 on page 20

Chapter 9 on page 24

Chapter 9.4 on page 28

Chapter 11.4 on page 35

Chapter 11 on page 30

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Transport

WARNING
Risk of injury when lifting or dropping the device
Lifting and positioning heavy devices can, for example, stress intervertebral disks and cause
chronic changes to the lumbar or cervical spine. The device may fall.
X Use a lifting device to lift and position the device.

NOTICE
Damaging/destroying the device
Optical components may be damaged if the device is subjected to hard shocks or is allowed
to fall.
X Handle the device carefully when transporting or installing it.
X To avoid contamination, cover the apertures with the provided lid or optical tape.
X Only transport the device in the original PRIMES transport box.

NOTICE
Damage/destruction of the device caused by leaking or freezing cooling water
Leaking cooling water can damage the device. Transporting the device at temperaturesnear or below freezing and without emptying the cooling circuit completely can damage thedevice.
X Empty the lines of the cooling circuit completely.
X Don’t use any compressed air to empty the cooling circuit.
X Even when the lines of the cooling circuit have been emptied, a small amount of residual
water will remain in the device at all times. This may leak out and end up inside the device.
Close the connector plug of the cooling circuit with the included sealing plug.

7

Installation

7.1

Preparation and installation position

Check the space available before mounting the device, especially the required space for the connection
cables and hoses (please see chapter 18 „Dimensions“ on page 50). The device must be firmly assembled
and must be mounted with screws (see chapter 7.3 on page 17).
The LaserQualityMonitor LQM+ can be mounted and operated in any position. During open beam measurement, the LaserQualityMonitor LQM+ must be aligned with the laser beam. The steps taken for installation
can be found in chapter 5.3 on page 13.

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7.2

Manually aligning the LaserQualityMonitor LQM+

For an open beam measurement, the LaserQualityMonitor LQM+ must be aligned with the alignment tool to
the laser beam. The inlet aperture must be aligned centrally and at a right angle to the laser beam:
1. Align the LaserQualityMonitor LQM+ manually with a pilot laser and the alignment tool.
• The LaserQualityMonitor LQM+ is properly aligned when the pilot beam is centered through the holes in
the alignment tool.
2. Check the alignment as specified in chapter 11.4 on page 35 with the alignment mode of theLaserDiagnosticsSoftware LDS.
7.2.1

Alignment tool

An alignment tool is provided for the various LaserQualityMonitor versions that can be used for all aperture
diameters. After inserting the alignment tool into the aperture, it is fastened to a metal half ring with magnets.
Magnets

Fig. 7.1:

7.2.2

Alignment tool for aligning the LQM+ versions with various apertures

Manual alignment of the LQM+ 20 basic device and the LQM+ 200/500 with 1st attenuator

LQM+ 20 basic device
Fig. 7.2:

Metal half ring

LQM+ 200/500 with 1st attenuator

Alignment tool mounted on the LQM+ 20 basic device and the LQM+ 200/500 with 1st attenuator

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Fine adjustment at the 1st attenuator

With the 1st attenuator, the angle of incidence of the laser beam can be finely adjusted to the appropriate
angle with two integrated micrometer screws (see Fig. 7.3 on page 16).
The laser beam can thus be aligned within the boundaries for the LaserQualityMonitor LQM+. The feedback
to change the beam position through fine adjustments is issued via the LaserDiagnosticsSoftware LDS (seechapter 11.4 on page 35).

++-

Fig. 7.3:

16

Micrometer screws on the 1st attenuator module for fine adjustment (for the example of the LQM+ 500)

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7.3

Install the LaserQualityMonitor LQM+

DANGER
Serious eye or skin injury due to laser radiation
For an open beam measurement, the LaserQualityMonitor LQM+ must be aligned to thelaser beam.
If the device is moved from its calibrated position, increased scattered or directed reflectionof the laser beam occurs during measuring operation (laser class 4).
X When mounting the device, please ensure that it cannot be moved, neither due to an unintended push or a pull on the cables and hoses.

7.3.1

Install the LQM+ 20/200/500 without bottom plate
60

285

120

60

44.3

150
Fig. 7.4:

Fastening threaded holes LQM+ 20/200/500 without bottom plate

There are four M6 mounting threads on the underside of the device for fastening it onto a holder provided by
the customer. We recommend screws of the strength class 8.8.
4 threaded holes M6

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LaserQualityMonitor LQM+

Install the LQM+ 200/500 with bottom plate

120

M6

60

Fig. 7.5:

Fastening threaded holes LQM+ 200/500 with bottom plate

For the connection of a customer specific part, there are four threads M6 in the bottom plate. We recommend screws of the strength class 8.8.
4 threaded holes M6

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7.3.3

Fig. 7.6:

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Install the LQM+ HP with bottom plate

Fastening bores and alignment threads LQM+ HP with bottom plate

4 mounting holes Ø 7.8 mm
4 threaded holes M8 for the alignment

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Connect cooling circuit (LQM+ HP and LQM+ 500 only)

DANGER
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 Operate the device with a connected water cooling and a sufficient water flow rate only.

8.1

Water quality

NOTICE
Damage/Destruction of the device due to different chemical potentials
The parts of the device which get in contact with cooling water consist of copper, brass or
stainless steel. Connecting the unit to a colling curcuit containing aluminum components
may cause corrosion of the aluminum due to the different chemical potentials.
X Do not connect the device on a cooling circuit in which aluminum components are installed.
•
•
•
•
•

8.2

The device can be operated with tap water as well as demineralized water.
Do not operate the device on a cooling circuit containing additives such as anti-freeze.
Do not operate the device on a cooling circuit in which aluminum components are installed. Especiallywhen it comes to the operation with high powers and power densities, it may otherwise lead to corrosionin the cooling circuit. In the long term, this reduces the efficiency of the cooling circuit.
Should the cooling fail, the device can withstand the laser radiation for a few seconds. In this case,please check the device as well as the water connections for damages.
Large dirt particles or teflon tape may block internal cooling circuits. Therefore, please thoroughly rinse
the system before connecting it.

Water pressure

Normally, 2 bar primary pressure at the entrance of the absorber are sufficient in case of an unpressurized
outflow.

NOTICE
Damage/Destruction of the device due to overpressure
X The maximum permissible water inlet pressure must not exceed 4 bar.

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8.3
•
•

Humidity
The device must not be operated in a condensing atmosphere. The humidity has to be considered inorder to prevent condensates within and outside the device.
The temperature of the cooling water must not be lower than the dew point (see Tab. 8.1 on page 21).

NOTICE
Damage/Destruction of the device due to condensing water
Condensation water inside of the objective will lead to damage.
X Mind the dew-point in Tab. 8.1 on page 21.

40

100

35

80
70
60

30

50
25

40

20

30

15

20

Relative humidity in %Cooling water temperature in °C

Do only cool the device during the measuring operation. We recommend starting the cooling approx. 2 minutes before the measurement and terminating it approx. 1 minute after the measurement.

10
5
10

0
0

Tab. 8.1:

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 cannot fall below 14 °C.

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8.4

Water connections and water flow rate

8.4.1

LQM+ HP (10 kW and 20 kW)

LQM+ HP (10 kW)
Connection diameter

Recommended flow rate

Minimum flow rate

PE hoses 16 mm

7 l/min – 8 l/min (1 l/(min · kW)

Not lower than 4.5 l/min

Connection diameter

Recommended flow rate

Minimum flow rate

PE hoses 16 mm

16 l/min – 20 l/min (1 l/(min · kW)

Not lower than 14 l/min

LQM+ HP (20 kW)

8.4.2

LQM+ 500

LQM+ 500
Connection diameter

Recommended flow rate

PE hoses 6 mm

1.5 l/min (1 l/(min · kW)

Cooling Circuit LQM+ HP(return flow)
Cooling Circuit LQM+ HP(inlet flow)

Cooling Circuit LQM+ 500(return flow)
Cooling Circuit LQM+ 500(inlet flow)
Fig. 8.1:

22

Water connections of the LQM+ HP and the LQM+ 500

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8.4.3

Remove the sealing plugs of the water connections
1. Please push down the release ring of the connection
and pull out the plug with your free hand.

Release ring

2. Remove the sealing plugs of the water connections andkeep it in a save place.

1. Push

2. PullFig. 8.2:

3. Close the flow line (Water In) and the return flow (Water
Out) of the device, by inserting the hose as far as possible (approx. 2 cm deep).

Remove the sealing plugs of the water connections

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Electrical connection

The LaserQualityMonitor LQM+ requires a supply voltage of 24 V ±5 % (DC) for the operation. A suitable
power supply is included in the scope of delivery.
Please use only the provided PRIMES power supply and connection lines.
Please ensure that all electrical connections have been established and switch the device on before
starting the LaserDiagnosticsSoftware LDS.
The LaserQualityMonitor LQM+ serves as a dongle for the software on the computer in order toenable certain software functions.

9.1

Connections
On/Off switch

Mains supply
connection
Fig. 9.1:

24

LAN socket

Input
external trigger
BNC

Outputinternal trigger
BNC

Safety circuit connection(Safety interlock)Connections

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9.2

Pin assignment

9.2.1

Power supply

Harting M12-P-PCB-THR-2PC-5P-LCOD-M-STR (view: connector side)
3

2

4

1
FE

Tab. 9.1:

9.2.2

Pin

Function

1

+24 V

2

Not assigned

3

GND

4

Not assigned

5

FE (functional earth)

Connection socket for the PRIMES power supply in the connection panel

Inlet external trigger

BNC connector (view: connector side)

1
2

Fig. 9.2:

9.2.3

Pin

Function

1+5 V (Trigger signal)

2

GND

Connection socket Inlet for an external trigger in the connection panel

Outlet internal trigger

BNC connector (view: connector side)

1
2

Fig. 9.3:

PinFunction

1+5 V (Trigger signal)

2

GND

Connection socket Outlet for the internal trigger in the connection panel

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9.3

Safety facilities

9.3.1

Monitoring side access to the measuring objective and neutral-density filters

A safety switch monitors the side frame plates. When the frame plate is removed, the laser will switch off if
the safety interlock is connected.

DANGER
Serious eye or skin injury due to laser radiation
When the safety interlock is not connected, radiation (Laser class 4) reflected during measuring operation may escape from the device when the side frame plate is open.
X Only operate the device with a mounted side frame plate.

Fig. 9.4:

9.3.2

Device with side frame plate removed

Temperature control

The 1st and 2nd attentuators each have a temperature switch built into them that will trigger a warning message in the LaserDiagnosticsSoftware LDS when a temperature of 75 °C is exceeded. If the safety interlock
is connected, the laser will be turned off.

NOTICE
Damage/Destruction of the device
Without a safety interlock connected, the device may be damaged or destroyed when subjected to excess temperatures.
X Operate the device only with a connected safety interlock.
X The LaserQualityMonitor LQM+ should never be left unattended while taking measurements.

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9.3.3

Safety interlock

The port for a safety interlock, which monitors the 1st and 2nd attenuator for excess temperature and whether
or not the side frame plates are opened, is integrated into the LaserQualityMonitor LQM+ 20 basic device.

DANGER
Serious eye or skin injury due to laser radiation; Damage/Destruction of the device
If the safety interlock is not connected, the safety equipment of the device will not be monitored.
X Connect the laser control to terminals 1 to 4 so that the laser shuts off when these connection is interrupted.
Pin assignment (view: plug side)
Safety interlock connector
2

1
8

3
4

7
6

5

Fig. 9.5:

Safety interlock device plug in the connection panel

Binder M8; 86 6119 1100 00008
Pin

Function1

Safety interlock (potential free).
Connected with pin 2 when ready for operation. Connected with pin 3 when not ready.

2

Safety interlock (potential free). Connected with pin 1 when ready for operation.

3

Safety interlock (potential free). Connected with pin 1 when not ready for operation.

4

Safety interlock (potential free).
Connected with pin 5 when ready for operation. Connected with pin 6 when not ready.

5

Safety interlock (potential free). Connected with pin 4 when ready for operation.

6

Safety interlock (potential free). Connected with pin 4 when not ready for operation.

7+ 24 V

8

Safety interlock GND

Tab. 9.2:

Pin assignment safety interlock

When connecting the safety interlock with pin 1 and pin 3 or with with pin 4 and pin 5, it has to be ensured
that the laser is turned off when this connection is interrupted.
To be able to identify a connected safety interlock, pin 7 and pin 8 have to be bridged in the cable socket.
If the cable socket is not connected and the safety interlock is thus not active, a warning message in theLaserDiagnosticsSoftware LDS is issued. A suitable 8-pole cable socket is part of the scope of delivery.

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LaserQualityMonitor LQM+

Connection to the PC and connect power supply

NOTICE
Damage/Destruction of the device
When the electrical cables are disconnected during operation (when the power supply is applied), voltage peaks occur which can destroy the communication components of the measuring device.
X Please turn off the PRIMES power supply before disconnecting the cables.
1. Connect the device with the PC via a crossover cable or with the network via a patch cable.
2. Plug the power supply into the connector socket for the power supply.
PRIMES Power Supply

LQM+/LQM+ HP

orCrossover Cable

Fig. 9.6:

28

Patch cable

Ethernet

Ethernet

PC

LAN

Connection via Ethernet with a PC or a local network

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10

Status display

The status display consists of an indicator field that indicates the various states of the LaserQualityMonitor
LQM+ with various colors.
Color

Meaning

White

The device is switched on and operational

Yellow

Measuring

Red

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

Tab. 10.1:

States of the status display

Status display

Tab. 10.2:

Status display

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Measurement

11.1

Safety instructions

LaserQualityMonitor LQM+

DANGER
Serious eye or skin injury due to laser radiation
During the measurement the laser beam is guided on the device, which causes scattered or
directed reflection of the laser beam (laser class 4).
The LaserQualityMonitor LQM+ must not be operated in any of the available configurations
without taking the following precautions. All precautions must be taken, even when thefiber is in the collimator or fiber adapter.
X Please wear safety goggles adapted to the power, power density, laser wave length andoperating mode of the laser beam source in use.
X Wear suitable protective clothing and protective gloves.
X Protect yourself from laser radiation by separating protective devices (e.g. by using appropriate shielding).

DANGER
Serious eye or skin injury due to laser radiation
If the device is moved from its calibrated position, increased scattered or directed reflectionof the laser beam occurs during measuring operation (laser class 4).
X When mounting the device, please ensure that it cannot be moved, neither due to an unintended push or a pull on the cables and hoses.

DANGER
Serious eye or skin injury due to laser radiation
When the safety interlock is not connected, radiation (laser class 4) reflected during measuring operation may escape from the device when the side frame plate is open.
X Connect the device’s safety interlock to the laser control. Check that the safety interlock willturn off the laser properly in case of error.

NOTICE
Damage/Destruction of the device
Without safety interlock connected, the device may be damaged or destroyed when subjected to excess temperatures.
X Connect the device’s safety interlock to the laser control. Check that the safety interlock willturn off the laser properly in case of error.
X The LaserQualityMonitor LQM+ should never be left unattended while taking measurements.

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11.2

Selection and change of the measuring objective and the neutral density filter

11.2.1

Selection of the measuring objective

The selection of the correct measuring objective is of vital importance for the measurement quality. The limitation of use for the 1:1 or 5:1 measuring objectives is shown in the diagram Tab. 11.1 on page 31.
14

Beam diameter in mm

12
10
8
6
4
2
0
1

Tab. 11.1:

Blue area
Red area

10
M²

100

Range of application of the LQM+ objectives

1:1 measuring objective
5:1 measuring objective

d foc =

4⋅λπ⋅

f 200mmm⋅M 2
drawbeam
rawbeam

ExampleThe following example explains how a measuring objective is selected based on the minimum beam diameter in the LaserQualityMonitor LQM+ and the number of lit pixels to be achieved depending on the measuring objective (MOB).
λ= 1 064 nm
M²=1
drawbeam = 7.3 mm
dfoc = 37.10 µm (dfoc = Focus diameter of the internal caustic)
For a fill factor of 35 % and a resolution of 64 pixel minimum 22 illuminated pixels are needed.
Quantity of illuminated pixels at 4.4 µm pixel pitch =dfoc
4.4 µm· β (Magnification of the measuring objective 1 or 5)

MOB 1:1 --> 37.1 µm / 4.4 µm · 1 = 8 
MOB 5:1 --> 37.1 µm / 4.4 µm · 5 = 42 

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LaserQualityMonitor LQM+

Exchanging the measuring objective or the neutral density filter

For changing a measuring objective or the neutral-density filter, the plate on the side of the LaserQualityMonitor LQM+ has to be opened:
1.
2.
•
•

Turn off the laser.
Press down two locking bolts (see Fig. 11.1 on page 32):
The plate on the side will then jump out.
The safety interlock is triggered (see chapter 9.3.1 on page 26).

Optical components can be slid into the optical path of the LaserQualityMonitor LQM+ at three locations (seeFig. 11.1 on page 32, Positions 1, 2, 3).
Slot

Optical Component

1

5:1 Measuring objective

2

1:1 Measuring objective3

Neutral density filter (OD-Filter)

4

5

Tab. 11.2:

6

Storage slots for unused components

Slot positions of the optical components

Important:
In order to prevent measurement errors, there should only ever be one measuring objective inthe optical path at a time.
All insertions are coded differently via two dowels in order to keep the measuring objective and neutral-density filter from getting mixed up. The measuring objective and OD filter are also equipped with an electronic
memory chip (EEPROM). The EEPROM contains information on the measuring objectives and the OD filtersthat is displayed in the metadata of the LaserDiagnosticsSoftware LDS.
Locking Bolts (2x)

1

2

3

Receptacles (3x)4Fig. 11.1:

32

5

6

Slot positions for the optical components

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35,0(6NOTICE
Damage of the device
Contamination in the device can damage the optical components.
X Seal unused slots with the provided dummy inserts.

Fig. 11.2:

Dummy insert

DANGER
Serious eye or skin injury due to laser radiation
When the safety interlock is not connected and the the side frame plate is opened, radiation(Laser class 4) reflected during measuring operation may escape from the device.
X Only operate the device with a mounted housing plate.
3. Place the housing plate in the receptacles (see Fig. 11.1 on page 32).
4. Flip the housing plate up until the two locking bolts clip into place.
5. Check that the housing plate is plan on the casing.
11.2.3

Neutral density filter

Depending on laser beam source and configuration of the LaserQualityMonitor LQM+, it can be necessary to
reduce the power once more.
This is done with a neutral density filter which is able to go into the beam path in front of the CCD sensor.
The optical density of the filter can be varied between 1 (1:10) and 5 (1:100 000).

Fig. 11.3:

Neutral density filter

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11.3

Connect the LaserQualityMonitor LQM+ with the LaserDiagnosticsSoftware LDS

11.3.1Connect device

1.

Turn on the LaserQualityMonitor
LQM+.
The operating mode is shown in thestatus display (see chapter 10 on
page 29).

2.

Start the LaserDiagnosticsSoftware
LDS.

3.

Click on the Devices tab.

4.

Click on the + Connect to device
button under the tab.
The Connections window appears.

5.

Click on the desired device.

6.

Click on the Connect to device button.

11.3.2

Change the network address of a connected device

Proceed as follows in order to assign a different IP address to a connected device:
1.
2.
3.

34

Right-click on the device and selectthe Device settings menu point.
Enter in the desired IP address or
use the Use DHCP option and confirm the entry with OK.
Turn the LaserQualityMonitor LQM+
off and on again.

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11.4

Set up the LaserQualityMonitor LQM+ with the LaserDiagnosticsSoftware LDS

After performing manual alignment with the alignment tool as described in chapter 7.2 on page 15 (onlyfor an open beam measurement) or after inserting the fiber, you can check the alignment using a function of
the LaserDiagnosticsSoftware LDS.
11.4.1
1.

Choose the beam pointing function

Connect the device according tochapter 11.3 on page 34 with theLaserDiagnosticsSoftware LDS.
The LaserQualityMonitor LQM+ isdisplayed as a connected device.

2.

Click on CCD LQM+.
The menu Device control opens.

3.

Click on the Beam pointing buttonoron the drop-down list measurementmode and Beam pointing.

Function CCD LQM+

Drop-down list Measuring mode

The corresponding Device control
opens.
The Beam pointing workbench
opens with the following tools:••

Beam pointing stability with thewindows: Position and Angle
False-color image

Number of measuring points (planes)Enter the number of measuring points
shown in the Beam position workbench.
It is preset to 30 planes.

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Start beam search

1.

Follow the safety instructions in chapter 11.1 on page 30.

2.

Turn on the laser.

3.

Click on the Start button.
The progress of beam pointing
determination is indicated when Precaustic, Measuring beam pointing
and then Adjustment successful are
displayed in the notifications:Pre-caustic
During the pre-caustic, the optimal z1 andz2 positions along the beam propagation
are identified in the False-color image
window (see also Fig. 11.4 on page 39).

Measuring beam pointing
During the measurements, measuring
points are constantly recorded at the positions z1 and z2.
The current position of the beam ismarked with a large X, with previous positions being marked with a small x.
Align the laser beam so that the current measuring point X is centered in the
crosshairs as accurately as possible in the
Position and Angle windows.
Only for a 1st attenuator:
Use the adjusting screws on the 1st attenuator module.

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35,0(6The display of the beam position in the Position and Angle windows can be switched to a display of Beampointing stability by clicking on the gear icon.
You can reset the values for beam position stability in the Position and Angle windows by pressing the Reset button.
You can log the Beam pointing stability as described in chapter 11.4.3 on page 38.

Adjustment successful
As soon as the laser beam has been
properly aligned, the message Adjustment successful will appear
The display circle will change from red
to green.
4.

Click on the Stop button.

5.

Turn off the laser.

If the automated beam search is unable
to find the leaser beam, enter the positions of the measurements z1 and z2 for amanual beam search in accordance withchapter 11.4.4 on page 39.

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LaserQualityMonitor LQM+

Log beam pointing stability

You can log the beam pointing stability
under Device control > Settings:
1.

Enter the value of 0 in the Plane
quantity field.

2.

Click on the Projects tab.

3.
•

Click on the Start button.
Continuous measurement data forbeam position stability is generated in
the project tree.

4.

Click on the Stopbutton.

5.

Click on the Save icon in order tosave the measurement data.

The measuring points in the Position and Angle windows can be deleted by clicking the gear icon
Reset button.

and the

The measured data in the project tree is not deleted in the process.

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11.4.4

If the laser beam is not foundIf the laser beam isn’t found during the automatic beam search or if the laser beam is too large for the measuring area (the laser beam exceeds the size of the CCD sensor), you can manually enter the position of themeasurements z1 and z2 into the LaserDiagnosticsSoftware LDS for the beam search. The positions z1 andz2 define the scan range for the laser beam search.
Raw beam

Focusing optics

Scaning rangez1

z0

CCD sensor

z2

280
Fig. 11.4:

0

Position of the measurements z1 and z2 for entry into the adjustment preset fields

You can enter the measuring positions forthe beam search under Device control >Settings:
1.

Mark the checkbox Activate preset.

2.

Enter the measurement positions forz1 and z2 into the z-axis position(z1/z2) fields.

3.

Start the beam search according tochapter 11.4.2 on page 36.
If the laser beam still isn’t found, enter
the modified values into the z-axis
position (z1/z2) fields.

•

z1

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z0

z2

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LaserQualityMonitor LQM+

Perform an automatic caustic measurement

For the purpose of getting to know the LaserQualityMonitor LQM+, this chapter describes an automaticcaustic measurement with the LaserDiagnosticsSoftware LDS as an example.
For a detailed description of the software installation, file management and evaluation of the measured data,
please refer to the separate operating manual LaserDiagnosticsSoftware LDS.
11.5.1
1.

Choose automatic caustic measurement mode

Connect the device according tochapter 11.3 on page 34 with theLaserDiagnosticsSoftware LDS.
The LaserQualityMonitor LQM+ isdisplayed as a connected device.

2.

Click on CCD LQM+.
The Device control menu opens.

3.

Click on the Automatic Caustic button or
on the drop-down list measurementmode and Automatic Caustic.

Function CCD LQM+

Drop-down list Measuring mode

The corresponding Device control
opens.
The Automatic Caustic toolbench
opens with the following tools:
•
•
•

40

Caustic analysis
Plane analysis
Raw Beam Analysis

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11.5.2

Configure settings (Device control > Settings)

1.

Click on the Settings tab.

2.

Select the calibrated wavelength ofyour LQM+ in nm.
Enter the laser wavelength used in
nm.
Enter the laser output in W.

3.
4.

Only when measuring a time series
5. Enter the number of automatic caustic measurements.
6. Enter the measuring break between
automatic caustic measurements in s.

11.5.3

Configure advanced settings (Device control > Advanced)

1.

Click on the Advanced tab.

2.

Enter the number of pixels in thex/y-direction in order to configure theresolution on the CCD sensor.

3.

Enter the number of planes.
Specifying 21 planes already generates a valid measurement.

Save preset
You can save information on the beam
position in a file with preset.
If the laser beam isn’t found
1. Enter the determined values for z1
and z2 from the z-axis position into
the entry fields in the Pre-caustic
area as described in chapter 11.4.4
on page 39.
2. Click on the Save icon in order tosave the entry.

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z1

z0

z2

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Starting an automatic caustic measurement

1.

Follow the safety instructions in chapter 11.1 on page 30.

2.

Turn on the laser.

3.

Click on the Start button.
The progress of the measurement isshown in the Pre-caustic, Measurement caustic displays and then in
Measurement ended:

Pre-caustic
As the indication is being displayed, theoptimal measuring parameters such asmeasuring window position, measuringwindow size, integration time, and thez-range (measuring range along the beam
propagation) are determined automatically.
Measuring caustic
The actual measurement is carried out
during the indication.
Measurement completed
The measurement has been completed.
4.

Turn off the laser.

11.5.5

Measurement results display

The measurement results are shown in the opened tools after the measurement is completed (see below).
A detailed description of the tools and the assessment of the measuring results can be found in the separate
operating manual for the LaserDiagnosticsSoftware LDS.

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11.6

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Perform power measurement

With LaserQualityMonitor LQM+ devices, the power measurement can be performed at 500 W with a 1st attenuator. When there is an additional 2nd attenuator, the power can be measured separately at the 2nd attenuator. The measurements at the 1st and 2nd attenuators are performed in the same way.
Separately from the power measurement described in this chapter, the power measurement values areautomatically recorded for a single plane, caustic, or automatic caustic measurement and shown under the
Details table in the workbenches.
For the purpose of getting to know the LaserQualityMonitor LQM+, this chapter describes a power measurement with the LaserDiagnosticsSoftware LDS as an example.
You can find more detailed information on LaserDiagnosticsSoftware LDS in the separate operating manual
for the LaserDiagnosticsSoftware LDS.
11.6.1
1.

Choose power measurement mode

Connect the device according tochapter 11.3 on page 34 with theLaserDiagnosticsSoftware LDS.
The LaserQualityMonitor LQM+ isdisplayed as a connected device.

2.
•

Click on Power measurement 1.
The measurement is performed forthe 1st attenuator.

The corresponding Device control
opens.
The Power Measurement toolbench
opens.

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1.

LaserQualityMonitor LQM+

Configure settings (Device control)

Start and end a measurement as
described in chapter 11.6.3 on page 44.

Before the device offset can be determined, the device must go through athermalization period.
2.
3.
4.
•
•
5.
•
6.

After a measurement has ended andwithout the laser turned on, press theStart button.
After the display in the Power Measurement tool stabilizes, click on the
Stop button.
Click on the Set current value as
offset button.
The value will show up in the Additional Offset in W entry window.
The device offset can also be enteredmanually.
Enter the measurement duration inmin.
If a measurement duration is notentered, the power will be measured
indefinitely.
Enter the Measurement frequency
in Hz.

11.6.3

Starting a power measurement

1.

Follow the safety instructions in chapter 11.1 on page 30.

2.

Turn on the laser.

3.

Click on the Start button.
The progress of the measurement isdisplayed.

When a measuring period is entered in the
Device control > Measurement duration in min. entry window, the measurement is terminated automatically.
4.
•

Click on the Stop button.
The measurement is completed.

5.

Turn off the laser.

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11.6.435,0(6

Measurement results display

The measurement results are shown in the opened tool Power Measurement after the measurement is completed (see below).
A detailed description of the tools and the assessment of the measuring results can be found in the separate
operating manual for the LaserDiagnosticsSoftware LDS.

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Troubleshooting

Error

Possible cause

RemedyError during ameasurement

•
•

1.
2.

•
Apart from the ambient noise and zero
offset, no measuring signal is available.

Data transmission error
Processor crash in themeasuring system
Program execution error

3.

Restart the software.
Turn off the supply voltage, turn it on
again, and start another reset cycle.
Restart the computer.

The device is not aligned
correctly.

Check the device alignment to the laser
beam.

The power density in thefocus is too low.

Increase the laser power.

The side frame plate is not
closed.

Close the side frame plate.

The temperature sensor in
the device is measuring atemperature > 60° C.

1.
2.

Error messages in
LaserDiagnosticsSoftware LDS

Possible cause

RemedyAttention, the casing is open! Pleaseclose the casing again after changing themeasuring objectives.

The side frame plate is not
closed.

Close the side frame plate.

No measuring objectiv or two measuring
objectives detected.

A measuring objectiv has notbeen inserted or two measuring objectives have been
inserted into the device.

Insert only one measuring objective.
Check the position of the measuring
objective.

The measuring objectiv used is not calibrated for this device, the accuracy canbe increased considerably.

A measuring objectiv froma different device may havebeen inserted.

Check the inserted measuring objective.
PRIMES should calibrate the measuring
objectiv for higher accuracy.

Measurement can’t be taken, the connection with the camera head has been
disrupted. Please turn the device off andon again.

The device wasn’t able toinitialize the camera head.

Turn the device off and on again.

Error in saving the user-defined device
settings, the parameters must be reset.

It wasn’t possible to save thedevice settings in the device.

Save the device settings again.

Internal device error. Turn the device off
and on again. Device moves to the start
position during this process.

The device is experiencing
an internal error.

Turn the device off and on again.

The safety interlock has been triggered.

Tab. 12.1:

46

Turn off the laser immediately.
Check the cool water supply (only
LQM+ HP and LQM+ 500 (cooled bywater).

Troubleshooting

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1335,0(6

Maintenance and service

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 or calibration.
If the device is used only sporadically, the maintenance interval can also be extended up to 24 months.

14

Storage

Please note before storing devices with water cooling circuit:

NOTICE
Damage/destruction of the device caused by leaking or freezing cooling water
Leaking cooling water can damage the device. Storing the device at temperatures near or
below freezing and without emptying the cooling circuit completely can damage the device.
X Empty the lines of the cooling circuit completely.
X Don’t use any compressed air to empty the cooling circuit.
X To avoid contamination, please cover the apertures with the provided lid or optical tape.
X Even when the lines of the cooling circuit have been emptied, a small amount of residual
water will remain in the device at all times. This may leak out and end up inside the device.
Close the connector plug of the cooling circuit with the included sealing plug.
X Store the device in the original PRIMES transport box.

15

Measures for the product disposal

Due to the Electrical and Electronic Equipment Act (“Elektro-G“) PRIMES is obliged to dispose PRIMES measuring devices manufactured after August, 2005, free of charge.
PRIMES is a registered manufacturer in the German “Used Appliances Register“ (Elektro-Altgeräte-Register“EAR“) with the number WEEE-reg.-no. DE65549202.
Provided that you are located in the EU, you are welcome to send your PRIMES devices to the following address, where they will be disposed free of charge (this service does not include shipping costs):
PRIMES GmbH
Max-Planck-Str. 264319 Pfungstadt
Germany

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LaserQualityMonitor LQM+

Declaration of conformity

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17

Technical data

Measurement Parameters

LQM+ 20

LQM+ 200/500

LQM+ HP (10 kW)

LQM+ HP (20 kW)

Power range for 1064 nm

20 W

200 W
(opt. 500 W)

M² < 5 = 3 kW
M² > 5 = 10 kW

M² < 5 = 5 kW
M² > 5 = 20 kW

Pulse duration
Wavelength range

100 fs - cw
340 – 360 nm (UV)/
515 – 545 nm (Green)/
1 030 – 1 090 nm (NIR)

Beam dimensions

532 nmon request/
1 030 – 1 090 nm(NIR)

1.5 – 9 mm

1 030 – 1 090 nm(NIR)

Single mode:
14 – 16 mm
Multi mode:
18 – 22 mm

Beam quality factor M²

1 - 50Max. beam divergence

10 mradDetermined parameters
Power density distribution

2D, 3D

Supply Data
Power supply
Cooling

24 V DC ± 5 %, max. 1.8 A
Air cooling

Air cooling (opt.
Water cooling)

Water cooling

Water cooling

Cooling water pressure---

2 bar primary pressure with anunpressurized outflow, max. 4 bar

min. 4 bar

Min. Cooling water flow rate---

1,5 l/min

18 l/minCooling water temperature Tin1)–-

1)

7 l/minDew point temperatur < Tin < 30 °C

Please consult with PRIMES before doing anything that does not comply with this specification.

Communication
Interface

Ethernet

Dimensions and Weight
Dimensions (L x W x H)
Weight285 x 190 x 180 mm

350 x 230 x 190 mm

480 x 300 x 190 mm

495 x 320 x 190 mm

approx. 10 kg

approx. 18 kg

approx. 35 kg

approx. 35 kg

Environmental Conditions
Operating temperature range

10 – 40 °C

Storage temperature range

5 – 50 °C

Reference temperature
Permissible relative humidity(non-condensing)

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22 °C
10 – 80 %49

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Dimensions

18.1

LQM+ 20

LaserQualityMonitor LQM+

150

AA

175
170

285

Ansicht
View
A A

All dimensions in mm (general tolerance ISO 2768-v)

50

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18.2

LQM+ 200/500 (without bottom plate)
75

89.9
129.5
169.5

310

ca. 5

A
A

285
385
299.3
413.7

View
A A
Ansicht
177
150

All dimensions in mm (general tolerance ISO 2768-v)

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LQM+ HP

109.9
104.9

185
190

18.3

LaserQualityMonitor LQM+

101.5

494.5
480

320

All dimensions in mm (general tolerance ISO 2768-v)

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19

Appendix

19.1

Changing the factory setting on the LQM+ 20/200UVNOTICE
Damage/Destruction of optical components
Changing the factory settings may lead to damages to the device during the measuring
operation.
X Changing the factory settings for positioning range is only allowed by well trained and experienced personnel. In case of any doubt, please contact PRIMES service.
The length of the internal beam path is influenced by the movement of prisms inside the device. Dependingon the optical properties and the pulse parameters of a laser source, damages to the internal optical elements can occur. Especially in case of short pulsed UV-lasers the damages are foreseen.
To prevent the device from getting damaged and to avoid a positioning of a prism close to the internal focus,
a shortened positioning range can be chosen.
The LaserQualityMonitor LQM+ 20/200UV is typically delivered with the shortened positioning range as afactory setting. Factory settings for standard and shortened positioning range are preset by a jumper, see
picture below.
You can change the positioning range by replugging a jumper in the device.

DANGER
Serious eye or skin injury due to laser radiation
If a safety interlock is not connected, a reflected beam (Class 4 Laser) may escape from thedevice when the laser is turned on and the side frame plate is open.
X Turn off the laser before removing the housing plate.
1.

Turn off the laser.

2.

Turn off the power supply of the
LQM+.

3.

Remove the housing plate on
the side of the device by pressing down the two locking bolts(see red arrows).

Jumper

The housing plate will then jumpout.

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NOTICE
Component susceptible to electrostatic discharge
The circuit board could be destroyed by electrostatic discharge.
X Before reconnecting the jumper, put on an ESD armband.
4.

Before switching the jumpers,
put on an ESD armband.

5.

On the board you can find ajumper which has to be brought
into the desired position.

6.
7.
8.
9.
•
•

54

Place the housing plate in thereceptacles (see Fig. 11.1 on
page 32) in the casing.
Flip the housing plate up until thetwo locking bolts clip into place.
Check that the housing plate isplan on the casing.

Position Shortened positioning range(factory setting for ultra short pulse laser)

Position B: Complete positioning range(factory setting for continuous wave laser)

Turn on the LaserQualityMonitor
LQM+.
The device moves the prism
carriage to a reference point andstops.
After referencing is initiated, theprism carriage will be locatedwithin the allowable range.

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19.2

HighYAG collimation module up to 6 kW

DANGER
Serious eye or skin injury due to laser radiation
During the measurement the laser beam is guided on the device, which causes scattered or
directed reflection of the laser beam (laser class 4).
The LaserQualityMonitor LQM+ cannot be operated in any of the available configurations
without taking the following precautions. All precautions must be taken, even when the fiber
is in the collimator or fiber adapter.
X Please wear safety goggles adapted to the power, power density, laser wave length andoperating mode of the laser beam source in use.
X Wear suitable protective clothing and protective gloves.
X Protect yourself from laser radiation by separating protective devices (e.g. by using appropriate shielding).
As an option PRIMES offers a 67 mm HighYAG collimation module which can be mounted directly to the 2nd
attenuator of the LQM+ HP.
Specifications
Max. power

6 kW (multi mode)
3 kW (single mode)

Focal length

67 mm

Acceptable divergence

160 mrad (half angle)*

Wavelength range

1 025 – 1 080 nm

Design wave length

1 064 nmFibre core diameter

10 – 1 000 µm

Fibre socket

LLK-D & QBH (LLK-B on request)* If the 67 mm collimation module is operated with LQM+ HP the divergence (half angle) cannot be morethan 110 mrad.
Tab. 19.1:

Specifications of the 67 mm HighYAG collimation module up to 6 kW

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LaserQualityMonitor LQM+

Key data for the cooling system for the HighYAG collimation module

Specifications
Max. cooling water pressure

6 bar

Min. cooling water flow rate

2 l/min

Cooling water quality

Deionized water with corrosion inhibitor

Filter mesh

< 100 µm

Tab. 19.2:

Specifications of the cooling system

Cooling circuit
LQM+ HP (return flow)
Cooling circuit
LQM+ HP (inlet flow)

Cooling circuit
collimator

Fig. 19.1:

19.2.2

Water connections

Schematic of the cooling system for the HighYAG collimation module
Important: The collimator cannot be connected to the cooling circuit of the LQM+ HP, but rather
to the cooling circuit of the fiber.

Fiber adapter
Collimator

Fig. 19.2:

56

Scheme cooling curcuit collimation module

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19.2.3

Remove/Install the HighYAG collimation module

Necessary tools:• Allen key, a. f. 2.5 mm• Allen key, a. f. 3 mm

NOTICE
Damage/Destruction of optical components
A contaminated measuring objectiv can heat up, change optical properties and potentiallybe damaged.
X To avoid contamination, only perform work in a clean environment.

Fig. 19.3:

Position of the collimation module

1.

Turn off the power supply of the LQM+.

2.

Loosen four set screws A by using the provided
allen key (a. f. 2.5 mm).

3.

Remove four covers B.

4.

Remove four screws C by using the provided allen
key (a. f. 3 mm)

5.

Install the protective cover D for storage of thecollimation module.

6.

After disassembling the collimation module, install
the fiber adapter to the attenuator module again.

7.

Protect the aperture of the fiber adapter against
dust by the red cab or with optical tape.

B

C

A

D

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Choosing the measuring objective with a HighYAG collimation module installed

Example 1:λ= 1 030 nm
M²= 12dfibercore = 100 µm
f= focal lengthd foc = d fibercore ⋅f LQMfibercoref col

dfoc = 299 µm
To enable a measurement within ±3 zR the estimated number of illuminated pixels at the focus should be lessthan 350.
Quantity of illuminated pixels at 4.4 µm pixel pitch =dfoc
4,4 µm· β (Magnification of the measuring objective 1 or 5)

Measuring objective (MOB) 1:1 --> 299 µm / 4,4 µm x 1 = 68 
Measuring objective (MOB) 5:1 --> 299 µm / 4,4 µm x 5 = 340 
Example 2:λ= 1 064 nm
M²= 5.5
dfibercore = 50 µm

Θ=4⋅λ ⋅M 2
π ⋅ d fibercore
fibercoreΘ = 150 mrad
drawbeam =drawbeam =58

150 mrad · 67 mm
1m

Θ · fcol1m= 10.05 mm

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14

Beam diameter in mm

12
10
8
6
4
2
0
1
Fig. 19.4:

10
M²

100

Range of application of the LQM+ measuring objectives

Measuring objective (MOB) 1:1 --> Measuring objective (MOB) 5:1 --> The two examples demonstrates the calculation of beam parameters based on a given collimator focal
length. The calculation can also be done using other collimator focal lengths.

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LaserQualityMonitor LQM+

IPG collimation module up to 20 kW

DANGER
Serious eye or skin injury due to laser radiation
During the measurement the laser beam is guided on the device, which causes scattered or
directed reflection of the laser beam (laser class 4).
The LaserQualityMonitor LQM+ cannot be operated in any of the available configurations
without taking the following precautions. All precautions must be taken, even when the fiber
is in the collimator or fiber adapter.
X Please wear safety goggles adapted to the power, power density, laser wave length andoperating mode of the laser beam source in use.
X Wear suitable protective clothing and protective gloves.
X Protect yourself from laser radiation by separating protective devices (e.g. by using appropriate shielding).
As an option PRIMES offers a IPG collimation module which can be mounted directly to the 2nd attenuator of
the LaserQualityMonitor LQM+.
Specifications
Max. power

20 kW (Multi mode)
5 kW (Single mode)

Focal length

100 mm

120 mm

160 mm

180 mm

200 mm

Acceptable divergence

220 mrad190 mrad140 mrad110 mrad110 mradDesign wave length

1 070 nmFibre socket

HLC 8 und HLC 16

Tab. 19.3:

Specifications of the IPG collimation module up to 20 kW

For the measurement of a divergent beam emerging from a fiber, the user is free to combine the LQM+ HP(20 kW) with any collimator that is suitable for the required power range and produces a minimum of artifacts.
At the date of issue (August 2018), we are only aware of one supplier (IPG Photonics) delivering collimator
units with a specification of 20 kW. As an option, PRIMES can combine the LQM+ HP with a collimator fromthat supplier.
The following table lists the available collimators from that source and the nummerical aperture that can bemeasured if these collimators are combined with the LQM+ HP (20 kW).

60

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19.3.1

Possible combinations of the LaserQualityMonitor LQM+ HP (20 kW) with IPG collimators

Possible combinations of the LQM+ HP (20 kW) with IPG collimators and resulting nummerical aperture (NA)for a measurement. Color code is corresponding to the resulting diameter of the collimated light.
Light green: diameterTable
suitablefor combinations
single mode
2 mm and∙ mrad),2: Possibleof themeasurement
LQM 20kW with IPG(<
collimators
resulting NA for a measurement. Color code isto theresultingdiameterof the collimated(>light.
Light green:
diameter suitable for single mode
Dark green: diametercorresponding
suitable for
multi
mode
measurement
2 mm∙ mrad).
measurement(< 2mm*mrad), dark green: diameter suitable for multi mode measurement(> 2mm*mrad).

Tab. 19.4:

NA

(Full
(fullangle)
angle)
divergence //radDivergence
rad

100

Focus (Collimator)f (collimator)//mm
mm
120

160

180

200

0,03

0,0600

6,00

7,20

9,60

10,80

12,00

0,035

0,0700

7,00

8,40

11,20

12,60

14,00

0,04

0,0800

8,00

9,60

12,81

14,41

16,01

0,045

0,0900

9,01

10,81

14,41

16,21

18,01

0,05

0,1000

10,01

12,01

16,02

18,02

20,02

0,055

0,1100

11,01

13,22

17,62

19,82

22,03

0,06

0,1200

12,02

14,42

19,23

21,63

24,04

0,065

0,1301

13,02

15,63

20,84

23,44

26,05

0,07

0,1401

14,03

16,84

22,45

25,25

28,06

0,075

0,1501

15,04

18,05

24,06

27,07

30,08

0,08

0,1601

16,05

19,26

25,67

28,88

32,09

0,085

0,1702

17,06

20,47

27,29

30,70

34,11

0,09

0,1802

18,07

21,68

28,91

32,52

36,14

0,095

0,1902

19,08

22,90

30,53

34,35

38,16

0,1

0,2003

20,09

24,11

32,15

36,17

40,19

Possible combinations of the LaserQualityMonitor LQM+ HP (20 kW) with IPG collimators

The use of the measuring objectives 1:1 and 5:1

Using measuring objectives of 2 different magnifications, the range of M² values that can bemeasured is extended. The following table lists the combination of beam diameters and M² values
that are accessible, and which measuring objective must be used for this combination.
Table 3: The use of the 5:1 (dark green) and 1:1 (light green) measuring objective. Dark grey: SM beam, diameter too large.
Light grey: MM beam, spot diameter in internal beam path too large. The numbers correspond to the spot diameter (unitµm) in the internal beam path, which must be below 700 µm. Up to 1.2mm internal spot size, a measurement is possible
with higher uncertainty of measurement yellow, (<10% diameter deviation, less than 3 Rayleigh-lengths of measurement
range in z will be available).

Beam Diameter / mm (2nd moment)

Bea m Qua l i ty M²

Revision 02/2019 EN

1

1,2

1,4

1,6

1,8

2

4

5

6

10

15

20

25

8

42

51

59

67

76

84

169

211

253

422

633

844

1054 1265 1687 1898

30

40

45

9

37

45

52

60

67

75

150

187

225

375

562

750

937

1125 1500 1687

10

34

40

47

54

61

67

135

169

202

337

506

675

844

1012 1350 1518

11

31

37

43

49

55

61

123

153

184

307

460

613

767

920

1227 1380

12

28

34

39

45

51

56

112

141

169

281

422

562

703

844

1125 1265

13

26

31

36

42

47

52

104

130

156

260

389

519

649

779

1038 1168

14

24

29

34

39

43

48

96

121

145

241

362

482

603

723

964

1085

15

22

27

31

36

40

45

90

112

135

225

337

450

562

675

900

1012

16

21

25

30

34

38

42

84

105

127

211

316

422

527

633

844

949

17

119

198

298

397

496

595

794

893

18

112

187

281

375

469

562

750

844

19

107

178

266

355

444

533

710

799

20

101

169

253

337

422

506

675

759

21

96

161

241

321

402

482

643

723

22

92

153

230

307

383

460

613

690

61

0,07

0,1401

14,03

16,84

22,45

25,25

28,06

0,075

0,1501

15,04

18,05

24,06

27,07

30,08

0,08

0,1601

16,05

19,26

25,67

28,88

32,09

0,085

0,1702

17,06

20,47

27,29

30,70

34,11

0,09

0,1802

18,07

21,68

28,91

32,52

36,14

0,095

0,1902

19,08

22,90

30,53

34,35

38,16

0,1

0,2003

20,09

24,11

32,15

36,17

40,19

35,0(619.3.2

LaserQualityMonitor LQM+

The use of the measuring objectives 1:1 and 5:1

The use of the measuring objectives 1:1 and 5:1

Usingobjectives
measuring objectivesof 2 different
magnifications, thethe range
M²beamvaluesqualitythat canM²
be values that can be
Using measuringof two different
magnifications,rangeofof
measured is The
extended.
The following
tablethelistscombination
the combinationofofbeam
beam diameters
andandM² values
measured is extended.
followingtable lists
diameters
beam quality M² valthat are accessible,
and whichmeasuringobjective
objective mustbe beusedused
for thisues that are accessible,
and whichmeasuringmust
forcombination.
this combination.
Table 3: The use of the 5:1 (dark green) and 1:1 (light green) measuring objective. Dark grey: SM beam, diameter too large.

Light grey:
MM beam,spotdiameter
diameter in internalbeam path too large. The numbers correspond to the spot diameter (unit
Dark grey: Single
mode
beam,
too large.
µm) in the internal beam path, which must be below 700 µm. Up to 1.2mm internal spot size, a measurement is possible
Light grey: Multi
mode
beam,
spot
diameterininternal beam path too large.
with higher uncertainty of measurement yellow, (<10% diameter deviation, less than 3 Rayleigh-lengths of measurement
range in z will be available).

Beam diameter / mm(secondmethod)Beam Diameter/ mmmoment(2nd moment)

Beam quality
M² l i ty M²
Bea m Qua

Tab. 19.5:

1

1,2

1,4

1,6

1,8

2

4

5

6

10

15

20

25

8

42

51

59

67

76

84

169

211

253

422

633

844

1054 1265 1687 1898

30

40

45

9

37

45

52

60

67

75

150

187

225

375

562

750

937

1125 1500 1687

10

34

40

47

54

61

67

135

169

202

337

506

675

844

1012 1350 1518

11

31

37

43

49

55

61

123

153

184

307

460

613

767

920

1227 1380

12

28

34

39

45

51

56

112

141

169

281

422

562

703

844

1125 1265

13

26

31

36

42

47

52

104

130

156

260

389

519

649

779

1038 1168

14

24

29

34

39

43

48

96

121

145

241

362

482

603

723

964

1085

15

22

27

31

36

40

45

90

112

135

225

337

450

562

675

900

1012

16

21

25

30

34

38

42

84

105

127

211

316

422

527

633

844

949

17

119

198

298

397

496

595

794

893

18

112

187

281

375

469

562

750

844

19

107

178

266

355

444

533

710

799

20

101

169

253

337

422

506

675

759

21

96

161

241

321

402

482

643

723

22

92

153

230

307

383

460

613

690

The use of the 5:1 (dark green) and 1:1 (light green) measuring objective

The numbers correspond to the spot diameter (unit μm) in the internal beam path, which must be below
700 μm. Up to 1.2 mm internal spot size, a measurement is possible with higher uncertainty of measurement
yellow, (<10% diameter deviation, less than 3 Rayleigh-lengths of measurement range in z will be available).
19.3.3

Maximum
Power
MaximumPowertable is aof
summaryof theabovetables above
and lists
maximum power
power thecan measureaThis table is aThissummary
the tables
and lists
thethemaximum
theLQM
LQM+
HP canasmeasureas afunction
of
M²
and
beam
diameter.
function of beam quality M² and beam diameter.
Table 4: maximum power. Numbers in kW.

Beam diameter / mm(second
momentBeam
Diameterin mm (2ndmethod)
Moment)

Beam
M²
Beam
Qualityquality
M²

Tab. 19.6:

62

8
9
10
11
12
13
14
15
16
17
18
19
20
21
22

1
1,5
2,0
2,5
3,0
3,5
4
5
5
5

1,2
1,5
2,0
2,5
3,0
3,5
4
5
5
5

1,4
1,5
2,0
2,5
3,0
3,5
4
5
5
5

1,6
1,5
2,0
2,5
3,0
3,5
4
5
5
5

1,8
1,5
2,0
2,5
3,0
3,5
4
5
5
5

2
1,5
2,0
2,5
3,0
3,5
4
5
5
5

4
2,0
2,5
3,5
3,5
4,5
5,5
7
8
9

5
3,0
4,0
4,5
5,5
7,0
7,5
9
11
12

6
4
5
6
7
9
10
12
14
16
18
20
20
20
20
20

10
4
5
6
7
9
10
12
14
16
18
20
20
20
20
20

15
4
5
6
7
9
10
12
14
16
18
20
20
20
20
20

20
4
5
6
7
9
10
12
14
16
18
20
20
20
20
20

25
4
5
6
7
9
10
12
14
16
18
20
20
20
20
20

30

40

45

5
6
7
9
10
12
14
16
18
20
20
20
20
20

9
10
12
14
16
18
20
20
20
20
20

10
12
14
16
18
20
20
20
20
20

Maximum power

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19.4

Optical path in LQM+ HP (with IPG Collimator)
61
f = 67

2nd Attenuator

1st Beamsplitter

Fiber

110.8

Collimator
Beam entrance LQM+

69.3

LQM+ 20 basic device
0 to 140

25

Adjustable prismz = 280z=05:1 optics

CCD

1st Attenuator
1:1 optics
Fig. 19.5:

Optical Path in LQM+ HP (with IPG Collimator)

Length of the optical path (1st Attenuator
2nd Attenuator):<--> LQM+ = 25 mm + 69.3 mm = 94.3 mm<--> LQM+ = 25 mm + 110.8 + 61 mm = 196.8 mm

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LaserQualityMonitor LQM+

Formula and algorithms for raw beam back calulation

To calculate the raw parameters from the measured beam parameters of the focus, the formula given in
ISO11146 is used. Index F describes the beam parameters of the focus.
H1
2

H2
3

zR

zRF

1
f

x1
z0
Fig. 20.1:

f

x2
z0F

Raw beam back calculation

Beam waist radius within the raw beam

Far field divergence

Position of beam waist within the raw beam

Rayleigh length within the raw beam

With focus position difference

Beam diameter onto the focusing lens

64

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