NT370 series

High Energy IR Range Tunable Lasers
  • High energy MIR-IR OPO system
  • Ultrabroad tuning from 2500 to 18000 nm
  • Up to 13 mJ energy
  • 10/20 Hz repetition rate
  • High energy MIR-IR OPO system
  • Ultrabroad tuning from 2500 to 18000 nm
  • Up to 13 mJ energy
  • 10/20 Hz repetition rate

Features & Applications


  • Hands-free, automated wavelength tuning
  • Up to 15 mJ pulse energy in mid-IR spectral range
  • Less than 10 cm⁻¹ linewidth for most of the tuning range
  • 3–5 ns pulse duration
  • 10 or 20 Hz pulse repetition rate
  • Remote control pad
  • PC control via RS232 and LabView™ drivers
  • Separate output port for 1064 nm pump beam
  • OPO pump energy monitoring
  • Replacement of the flashlamps is done without misalignment of the laser cavity


  • Infrared spectroscopy
  • Cavity ring-down spectroscopy
  • Remote sensing
  • Material processing
  • Non-linear spectroscopy
  • Other laser spectroscopy applications


NT370 series tunable laser seamlessly integrates in a compact housing the nanosecond optical parametric oscillator and Nd:YAG Q-switched laser. Pumped by fundamental harmonics output the lasers provides tuning in mid- and far-infrared spectral range.

NT373-XIR model uses IR crystal based cascade OPO for tunable output in 4400 – 18000 nm range. Customized tuning ranges are available by request. The linewidth of NT373-XIR model is nearly constant across tuning range and it is less than 8 cm⁻¹.

NT377 model produces tunable output in 2500 – 4400 nm range. Pulse energy is exceeding 10 mJ for wavelengths shorter than 3600 nm, while linewidth is below 10 cm⁻¹ for the wavelengths longer than 3000 nm. Because of narrow linewidth of output radiation (typically in 6 – 10 cm⁻¹ range) the laser is suitable for many infrared spectroscopic applications, for example cavity ring-down spectroscopy, gas detection and remote sensing.

The device is controlled from the remote keypad or from PC through RS232 interface using LabView™ drivers that are supplied together with the system. The remote pad features a backlit display that is easy to read even while wearing laser safety glasses. System is designed for easy and cost-effective maintenance. Replacement of flashlamps can be done without misalignment of the laser cavity and deterioration of laser performance. OPO pump energy monitoring system helps to increase lifetime of the optical components.

Accessories and Options

-AWWater-air cooling option
-2020 Hz PRR option
-HOptional 1064 nm output


OPO 1)
Wavelength range2500 – 4400 nm5500 – 18000 nm 2)
Output pulse energy 3)12.5 mJ1 mJ
Linewidth 4)< 10 cm-1< 8 cm-1
Scanning step1 nm
Typical pulse duration 5)3 – 5 ns
Typical beam diameter 6)6 mm8 mm
Pump wavelength1064 nm
Max pump pulse energy300 mJ
Pulse duration4 – 6 ns
Beam quality"Hat-top" in near field
Beam divergence< 0.5 mrad
Pulse energy stability (StdDev)< 1 %
Pulse repetition rate10 or 20 Hz
Unit size (W × L × H)452 × 1020 × 270 mm
Power supply size (W × L × H)330 × 520 × 670 mm
Umbilical length 2.5 m
Water consumption (max 20 °C) 8) 9)10 l/min
Room temperature 18 – 27 °C
Relative humidity20 – 80 % (non-condensing)
Power requirements 10)208 or 240 V AC, single phase 50/60 Hz
Power consumption1.5 kVA
  1. Due to continuous improvement, all specifications are subject to change without notice. Parameters marked typical are not specifications. They are indications of typical performance and will vary with each unit we manufacture. Unless stated otherwise all specifications are measured at 3000 nm for NT377 unit and at 7000 nm for NT373-XIR units and for basic system without options.
  2. Please contact Ekspla for more detailed specifications.
  3. Output is specified at wavelengths defined in note 1. See tuning curves for typical outputs at other wavelengths.
  4. Linewidth is specified at wavelengths defined in note 1. See graph below for typical linewidth at other wavelengths.
  5. Estimate, assuming that pulse duration from OPO is by approx 1 ns shorter than one from pump laser.
  6. Beam diameter is measured at the FWHM level at the output aperture and can vary depending on the pump pulse energy.
  7. Laser output will be optimized for OPO operation and specification may vary with each unit we manufacture.
  8. Air cooled power supply is available as option.
  9. For 10 Hz PRR.
  10. Should be specified when ordering.

Note: Laser must be connected 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 a few hours before switching on.



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