NT340 seriesHigh Energy
Broadly Tunable
LasersF E AT U R E S▶ Hands-free no gap wavelengthtuning from 192 to 4400 nm *Picosecond Lasers

NT260 ▪ NT230 ▪ NT240 ▪ NT250 ▪ NT270 ▪ NT340

Femtosecond Lasers

NANOSECOND TUNABLE LASERS

spectral range▶ Up to 20 mJ pulse energy in MIR

spectral range▶ 3 – 5 ns pulse duration▶ Up to 20 Hz pulse repetition rate

▶ Remote control via key pad or PC▶ Optional separate shared output▶ Hands-free wavelength tuning –▶ High integration level saves valuable▶ The system is widely tunable▶ In-house design and manufacturing

no need for physical intervention
192 – 4400 nm and delivers highpulse energy (up to 90 mJ) thatallows the investigation of an
extensive range of materials▶ Up to 18 μm customization

possibility enables studies of IR
vibrations of molecules▶ Narrow linewidth (down to 3 cm⁻¹)and superior tuning resolution(1 – 2 cm⁻¹) allows recording ofhigh quality spectra▶ Flashlamps replacement without

space in the laboratoryof complete systems, including pumplasers, guarantees on-time warranty
and post warranty services andspares supply▶ Variety of control interfaces: USB,

REV. 20230327▶ OPO pump energy monitoring▶ Hermetically sealed oscillator

cavity protects non-linear crystals
from dust and humidity* Automatic wavelength scan is optional

RS232 and optional LAN, WLAN
ensures easy control and integration
with other equipment▶ Attenuator and fiber coupling

options facilitate incorporationof NT340 systems into various
experimental environments

misalignment of the laser cavity
saves on maintenance costs

The NT340 series tunable wavelengthnanosecond laser seamlessly
integrates the nanosecond opticalparametric oscillator and the Nd:YAGQ-switched nanosecond laser – all in
a compact housing.
The main system features are:hands-free wavelength tuning from UV
to IR, high conversion efficiency, optional
fiber-coupled output and separate
output port for pump laser beam.

port for 532/1064 nm beam
(separate output port for the355 nm beam is standard)

A P P L I C AT I O N S▶ Laser-induced fluorescence▶ Flash photolysis▶ Photobiology▶ Remote sensing

NT340 has a linewidth of lessthan 5 cm⁻¹, which is ideal for many
spectroscopic applications.
The laser is designed forconvenient use. The OPO pumpenergy monitoring system helps
to control pump laser parameters.
Replacement of laser flashlamps canbe done without misalignment of
the laser cavity and/or deteriorationof laser performance.

▶ Time-resolved spectroscopy▶ Non-linear spectroscopy▶ Vibrational spectroscopy▶ Cavity ring-down CRDS,

cavity ring-down laser absorption
CRLAS spectroscopy▶ Infrared spectroscopy▶ Gas spectroscopy

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Other Ekspla Products

BENEFITS

Nanosecond Lasers▶ Up to 15 mJ pulse energy in UV

Nanosecond
Nanosecond Tunable Wavelength
Wavelength Lasers
Lasersspectral range

Picosecond Tunable Wavelength Lasers▶ Up to 90 mJ pulse energy in visible81NT340 series

NANOSECOND TUNABLE LASERS
Femtosecond Lasers

Tuning range extending optional add-ons
OptionFeatures

Picosecond Lasers-SH

Second harmonic generator for 210 – 410 nm range-SF

Sum-frequency generator for 300 – 410 nm range with high pulse energy-SH/SF

Combined option for highest pulse energy in 210 – 410 nm range-DUV

Deep UV option for 192 – 210 nm range output-MIR

Mid infrared option for 2500 – 4400 nm range output

Accessories and other optional add-ons
OptionFeaturesPicosecond Tunable Wavelength Lasers-FC

Fiber coupled output in 350 – 2000 nm range-ATTN

Attenuator-H, -2H

Separate shared output port for pump laser harmonic (532 or 1064 nm wavelengths)-AW

Air cooled power supply

S P E C I F I C AT I O N S 1)
ModelNT342B

NT342E

OPO

Wavelength range 2)
Nanosecond Lasers

Signal

410 – 710 nm 3)

SH generator (optional)

210 – 410 nm

Idler

710 – 2600 nm

SH/SF generator (optional)
DUV generator (optional)

210 – 410 nm
192 – 210 nm

MIR generator (optional)

n/a2500 – 4400 nm

n/a

OPO 4)

30 mJ

60 mJ

90 mJ

SH/SF generator (optional) 6)

6 mJ

10 mJ

15 mJ

20 mJ

n/a

Output pulse energy
Nanosecond
Nanosecond Tunable Wavelength
Wavelength Lasers
LasersOther Ekspla Products

82

NT342CSH generator (optional) 5)DUV generator (optional) 7)
MIR generator (optional)8)

Linewidth

4 mJ

0.6 mJn/a

Tuning resolution 10)

6.5 mJ

1.2 mJ< 5 cm⁻¹ 9)Signal (410 – 710 nm)

1 cm⁻¹

SH/SF/DUV (192 – 410 nm)

2 cm⁻¹

Idler (710 – 2600 nm)

n/a

Typical beam diameter 12)

5 mm

Typical beam divergence 13)
Polarization

1 cm⁻¹n/a8 mm

10 mm

3 – 5 ns
< 2 mradSignalhorizontal

SH/SFhorizontal

Idler

DUV
MIR

2 mJ

1 cm⁻¹MIR (2500 – 4400 nm)

Pulse duration 11)

10 mJverticaln/averticalhorizontal

n/a

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S P E C I F I C AT I O N S 1)
NT342B

NT342C

PUMP LASER 14)

Pump wavelength

Typical pump pulse energy

355 nm

100 mJ

Pulse duration
Beam quality

150 mJ< 0.6 mrad

Pulse energy stability (StdDev)
Pulse repetition rate

< 3.5 %

10 or 20 Hz

PHYSICAL CHARACTERISTICS

2.5 m

OPERATING REQUIREMENTS

Water consumption (max 20 °C) 16)< 10 l/minRoom temperature18 –27 °C

Relative humidity

20 – 80 % (non-condensing)Power requirements

200 – 240 VAC, single phase, 50/60 Hz

Power consumption< 1.5 kVA

Cleanliness of the room

3)

4)

5)

6)

7)

Tuning range extension to 400 – 709 nm is
optional.

Measured at 450 nm. See tuning curves fortypical outputs at other wavelengths.
Measured at 260 nm. See tuning curves fortypical outputs at other wavelengths.
Measured at 340 nm. SF generator is
optimized for maximum output in300 – 410 nm range. See tuning curves fortypical outputs at other wavelengths.

Measured at 200 nm. See tuning curves fortypical outputs at other wavelengths.

Measured at 2700 nm. See tuning curves fortypical outputs at other wavelengths.

9)

10)

11)

12)

13)

14)

15)

16)

Linewidth is <8 cm⁻¹ for 210 – 409 nm,
2500 – 4400 nm ranges.

DANGER

When wavelength is controlled from PC. When
wavelength is controlled from keypad, tuning
resolution is 0.1 nm for signal, 1 nm for idler,
MIR and 0.05 nm for SH, SF and DUV.

VISIBLE AND/OR INVISIBLE LASER RADIATIONAVOID EYE OR SKIN EXPOSURE TO DIRECT
REFLECTED OR SCATTERED RADIATION
Tunable, 192 – 4400 nm
Max. 150 mJ, pulse 4 – 7 ns
CLASS IV LASER PRODUCTFWHM measured with photodiode featuring
1 ns rise time and 300 MHz bandwidth
oscilloscope.

Beam diameter is measured at 450 nm at theFWHM level. It is approximate and can varydepending on the pump pulse energy andwavelength.

Full angle measured at the FWHM level at
450 nm, < 5 mrad at 3000 nm with MIR option.
Separate output port for the 355 nm beam isstandard. Outputs for 1064 nm and 532 nm
beams are optional. Laser output will beoptimised for the best OPO operation andspecifications may vary with each unit wemanufacture.
Length from 821 to 1220 mm depending on
configuration.
Air cooled power supply is available as anoption.

Fig 1. NT340 series laser typical beamprofile at 450 nm after ~1.5 m distancefrom output

Other Ekspla Products8)

Hands-free tuning range is from 192 nm to4400 nm. MIR option is not compatible with SFand DUV option. Inquire for custom IR option
with tuning up to 18 µm.

not worse than ISO Class 9

Nanosecond Lasers

330 × 490 × 585 mm

Umbilical length

Picosecond Tunable Wavelength Lasers

456 × 821 × 270 mm

Power supply size (W × L × H)

2)

10 Hz

Nanosecond
Nanosecond Tunable Wavelength
Wavelength Lasers
LasersUnit size (W × L × H) 15)

Due to continuous improvement, allspecifications are subject to change.
Parameters marked typical are illustrative;
they are indications of typical performanceand will vary with each unit we manufacture.
Unless stated otherwise, all specifications aremeasured at 450 nm and for basic system
without options.

250 mJ

4 – 7 ns

Hat-top in near field, without hot spots

Beam divergence1)

NT342E

Picosecond Lasers

ModelFemtosecond Lasers

NT340 series

NANOSECOND TUNABLE LASERS

REV. 20230327

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83

NT340 series

NANOSECOND TUNABLE LASERS
Wavenumber, 10³ × cm⁻¹
20.0
16.6
14.3 10.0

25.0

100
90

5.0

50.0
163.33

NT342E
NT342CNT342B

807060504030201086400500600
700 1000
Wavelength, nm2200

2000 3000

52.6

51.5

Wavenumber, 103 × cm-1
50.5
49.5
48.5

240

280
320360
Wavelength, nm

Fig 3. Typical output energy of theNT340 series tunable wavelength
systems with SH/SF extension
47.6

24

2.2

4.67

3.57

2400

2800

Wavenumber, 10³ × cm⁻¹
3.13
2.78
2.50

2.27

20

Pulse energy, mJ

1.8
1.4
1.00.6

198
202
Wavelength, nm

194206

210

Nanosecond Lasers

Fig 4. Typical output energy of theNT340 series tunable wavelength
systems with SH/DUV extension
14950 78

12803200
3600
Wavelength, nm

4000

4400

Fig 5. Typical output energy of theNT340 series tunable wavelength
systems with MIR extension

86NT342215

215

Fig 6. NT340 series
laser head typicaloutline drawing.
Unit length andport position varydepending on model

456

Nanosecond
Nanosecond Tunable Wavelength
Wavelength Lasers
Lasers405

239...249

190

164

DUV option for NT342E-SH
DUV option for NT342C-SH
DUV option for NT342B-SH

0.2

Other Ekspla Products

Note: Laser must beconnected to the mains
electricity all the time. If there
will be no mains electricity for
longer that 1 hour then laser(system) needs warm up for afew hours before switching on.

400

165...175

Picosecond Tunable Wavelength Lasers

Fig 2. Typical output energy of theNT340 series tunable wavelengthsystems

O R D E R I N G I N F O R M AT I O N

25.0

40Pulse energy, mJ

Wavenumber, 10³ × cm⁻¹
35.7
31.3
27.8

NT342E-SH/SF
NT342C-SH/SF
NT342B-SH/SF

1210O U T L I N E D R AW I N G S

41.7

14Pulse energy, mJ

Picosecond Lasers

Pulse energy, mJFemtosecond Lasers

PERFORMANCE

1020

NT342C-SH-10-AW-H/2H
Model
Output pulse
energy:B → 30 mJ
C → 50 mJE → 90 mJ

Pulse repetition
rate, in Hz
Optional tuning
range extension
SH 	 → 210 – 410 nm
DUV → 192 – 210 nm
MIR → 2500 – 4400 nm

Options:
AW → water-air heat exchanger
H 	 → 1064 nm output
2H 	 → 532 nm output

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84
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e-mail:voc@phototechnica.co.jp