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NT342 series High Energy Tunable Wavelength Lasers

NT342 series tunable laser system comprises a nanosecond optical parametric oscillator and Q-switched pump laser in a single housing. The system features up to 50 mJ in VIS, no-gap wavelength tuning from 192 nm to 2600 nm, up to 30 Hz repeptition rate, easy maintenance and separate output for pump laser beam.

NT342 series tunable wavelength laser

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  • Hands-free no gap wavelength tuning from 192 to 2600 nm
  • Up to 50 mJ pulse energy in visible spectral range
  • Up to 10 mJ pulse energy in UV spectral range
  • Less than 5 cm⁻¹ linewidth
  • 3 – 5 ns pulse duration
  • Up to 30 Hz pulse repetition rate
  • Remote control pad
  • PC control via RS232 and LabVIEW™ drivers
  • Optional separate shared output port for 355/532/1064 nm beam
  • OPO pump energy monitoring
  • Replacement of flashlamps without misalignment of the laser cavity
  • Hermetically sealed oscillator cavity protects non-linear crystals from dust and humidity


  • Laser-induced fluorescence
  • Flash photolysis
  • Photobiology
  • Remote sensing
  • Time-resolved spectroscopy
  • Non-linear spectroscopy

The NT342 series tunable wavelength nanosecond laser seamlessly integrates the nanosecond optical parametric oscillator and the Nd:YAG Q-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.
Narrow bandwidth models have a linewidth of less than 5 cm⁻¹, which is ideal for many spectroscopic applications.
The laser is designed for convenient use. It can be controlled from remote keypad or from a PC through an RS232 interface using LabView™ drivers that are supplied with the system. The remote keypad features a backlit display that is easy to read even through laser safety googles. The OPO pump energy monitoring system helps to control pump laser parameters. Replacement of laser flashlamps can be done without misalignment of the laser cavity and/or deterioration of laser performance.


Tuning range extending optional add-ons

Option Feature
-SH Second harmonic generator for 210 – 409 nm range
-SF Sum-frequency generator for 300 – 409 nm range with high pulse energy
-SH/SF Combined option for highest pulse energy in 225 – 409 nm range
-DUV Deep UV option for 192 – 210 nm range

Accessories and other optional add-ons:

Option Features
-FC Fiber coupled output in 350 – 2000 nm range
-ATTN Pulse energy attenuator
-H, -2H Separate shared output port for Nd:YAG pump laser harmonics (532 or 1064 nm wavelengths)
-AW Air cooled power supply

Specifications 1)

Model NT342A NT342B NT342C
Wavelength range2)
Signal 410-709 nm 3)
Idler 710-2600 nm
SH generator (optional) 210-409 nm
SH/SF generator (optional) 210-409 nm
DUV generator (optional) 192-209 nm
Output pulse energy
OPO 4) 15 mJ 30 mJ 50 mJ
SH generator (optional) 5) 2 mJ 4 mJ 6.5 mJ
SH/SF generator (optional) 6) 3 mJ 6 mJ 10 mJ
DUV generator (optional) 7) 0.3 mJ 0.6 mJ 1 mJ
Linewidth <5 cm-1 8)
Scanning step 9)
Signal (410-709 nm) 0.1 nm
Idler (710-2600 nm) 1 nm
SH/SF/DUV beam (192-409 nm) 0.05 nm
Pulse duration 10) 3-5 ns
Typical beam diameter 11) 4 mm 5 mm 7 mm
Typical beam divergence 12) <2 mrad
Signal beam horizontal
Idler beam vertical
SH/SF/DUV beam horizontal
Pump laser 13)
Pump wavelength 355 nm
Max pump pulse energy 50 mJ 100 mJ 150 mJ
Pulse duration 4-6 ns
Beam quality "Hat-Top" in near field, without hot spots
Beam divergence <0.6 mrad
Pulse energy stability (StdDev) <3.5 %
Pulse repetition rate 10 or 20 Hz 14) 10 or 20 Hz 10 Hz
Physical characteristics
Unit size (WxLxH) 15) 452x800x270 mm
Power supply size (WxLxH) 330x490x585 mm
Umbilical length 2.5 m
Operating requirements
Water consumption (max 20 °C) 16) 6 l/min
Room temperature 15-30 °C
Relative humidity 20-80 % (non-condensing)
Power requirements 208 or 240 VAC, single phase 50/60 Hz
Power consumption 17) 1.8/3.4 kVA

1) Due to continuous improvement, all specifications are subject to change without notice. Parameters marked typical are indications of typical performance and will vary with each unit we manufacture. Unless stated otherwise, all specifications are measured at 450 nm.
2) Hands-free tuning range is from 192 nm to 2600 nm.
3) Tuning range extension to 400 – 709 nm is optional.
4) Measured at 450 nm. See tuning curves for typical outputs at other wavelengths.
5) Measured at 260 nm. See tuning curves for typical outputs at other wavelengths.
6) Measured at 340 nm. SF generator is optimized for maximum output in 300 – 409 nm range. See tuning curves for typical outputs at other wavelengths.
7) Measured at 200 nm.
8) Linewidth is <8 cm-1 for 210 – 409 nm range.
9) Represents wavelength change quantum for manual input from control pad. When wavelength is controlled from PC, the wavelength set precision is  ~1 cm-1 in OPO range and ~2 cm-1 in SH/SFG range.
10) FWHM measured with photodiode featuring 1 ns rise time and 300 MHz bandwidth oscilloscope.
11) Beam diameter is measured at 450 nm at the FWHM level and can vary depending on the pump pulse energy.
12) Full angle measured at the FWHM level at 450 nm.
13) Separate output port  for the 355 nm beam is standard. Outputs for 1064 nm and 532 nm beams are optional. Laser output will be optimised for OPO operation and specifications may vary with each unit we manufacture.
14) 30 Hz version is available. Inquire for pulse energy specifications.
15) Length from 821 to 1220 mm depending on configuration.
16) At 10 Hz pulse repetition rate. Air cooled power supply is available.
17) At 10/20 Hz pulse repetition rate.

NT342 series tunable wavelength lasers ordering information