Features

• 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

Applications

• 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 the tuning in mid- and far-infrared spectral range.
NT373 model produces eye-safe output at 1.57 μm.
NT373-XIRx model uses the output from eye-safe OPO to pump AgGaSe₂ crystal based cascade OPO for tunable output in 4.1-12 μm range. Several sets of optics should be used to cover the whole tuning range; the standard ranges of 4.1-6, 6-12 and 5-11 μm are available. Customized tuning ranges are available by request. The linewidth of NT373-XIRx model is nearly constant across tuning range and less than 6 cm⁻¹.
NT377 model produces tunable output in 2.5-4.4 μm range. Pulse energy is exceeding 10 mJ for wavelengths shorter than 3.6 μm, while linewidth is below 10 cm⁻¹ for the wavelengths longer than 3 μm. 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 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 costeffective 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.

Specifications ¹⁾

Options

1) 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, at 1570 nm for NT373 unit and at 7.0 μm for NT373-XIRx units.
2) The number represents available output wavelength range. Three standard options are available with 4.1-6, 6-12 and 5-11 μm tuning ranges.
3) Output is specified at wavelengths defined in chapter 1. See tuning curves for typical outputs at other wavelengths.
4) Linewidth is specified at wavelengths defined in chapter 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 optimised 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.