NT270 series Tunable Wavelength NIR-MIR Range DPSS Lasers

The standard NT270 tuning range is 2500–4475 nm, corresponding to approximately 4000–2235 cm⁻¹. When wavelengths are entered manually from a PC, the minimum tuning step is 1 cm⁻¹; from the keypad, the stated tuning resolution is 1 nm. Motorised tuning and automatic scanning allow a sequence to run without physical adjustment of the OPO. For spectroscopy, the target absorption band should therefore be checked against both the wavelength span and the required spectral step. A custom infrared configuration extending to 12 µm can be discussed, but its exact output parameters should be confirmed for the intended wavelength.

At 3000 nm, the NT277 idler output is 80 µJ typical per pulse, with a 5–7 ns pulse duration and 1000 Hz repetition rate. A simple calculation gives 80 mW nominal average optical power at that reference point and approximately 11–16 kW pulse power when energy is divided by the stated duration. These calculated figures do not include pulse-shape effects or losses in downstream optics. Output energy changes across the tuning range, so 80 µJ should not be used as a universal value for every wavelength. Detector range, sample exposure and attenuation should be sized using the required operating wavelength and a suitable engineering margin.

Standard operation provides a linewidth below 10 cm⁻¹. A higher-energy option is available with a linewidth of 10–150 cm⁻¹ across the 2500–4475 nm range, and the narrow-linewidth mode cannot be used with that option. The choice is therefore a direct trade-off between spectral selectivity and the higher-energy configuration. Measurements intended to separate closely spaced absorption features will generally favour the narrower mode, whereas experiments driven by pulse energy may suit the alternative. Pulse energy at each target wavelength should be confirmed during configuration because the trade-off is wavelength-dependent rather than represented by one universal value.

The OPO idler is vertically polarised and has a typical 4 mm beam diameter at the wavelength used for the 3000 nm pulse-energy specification. Beam diameter is defined at the 1/e² level and varies with wavelength, so apertures and focusing optics should not be designed around a fixed 4 mm value alone. The 1064 nm pump output is available through a separate port, with 1.9 mJ typical pulse energy, pulse duration below 10 ns and a Gaussian fit above 90%. Pump pulse-energy stability is below 0.5% standard deviation. Both beam paths require wavelength-appropriate optics, attenuation, detection and Class IV laser safety controls.

Motorised tuning can be commanded from the local keypad or a PC, and automatic wavelength scans are supported. Interface choices include USB, RS-232, LAN and WLAN, although the available interface and protocol depend on the selected configuration. PC entry provides a 1 cm⁻¹ tuning step, while the keypad uses 1 nm resolution, so the chosen control route affects how a scan is programmed. Supplied PC drivers support software integration. Before ordering, define the required interface, command method, scan sequence and synchronisation with detectors or acquisition hardware operating at the 1 kHz pulse rate.

The NT277 is air cooled and does not require a water loop. It is intended for room temperatures of 18–27 °C, relative humidity of 20–80% without condensation, and room cleanliness no worse than ISO Class 9. Electrical input is 100–240 V AC, single phase, 50/60 Hz, with power consumption below 0.5 kW. The laser unit measures 305 × 701 × 270 mm, the power supply measures 449 × 376 × 140 mm, and the connecting umbilical is 2.5 m long. Installation planning should reserve airflow, cable routing and service access around both units.

The system should remain connected to mains electricity continuously. If mains power is unavailable for longer than one hour, a warm-up period of several hours is required before the laser is switched on for operation. This affects facilities planning because an extended outage cannot be followed by immediate measurement start-up. Laboratories with strict availability requirements should include the warm-up delay in operating procedures and consider how planned shutdowns will be managed. Any backup-power arrangement must be sized for the stated input range and power consumption and reviewed against the site’s laser safety and electrical requirements.

The NT270 series is intended for s-SNOM, single-molecule vibrational spectroscopy, infrared spectroscopy and gas spectroscopy. Its standard wavelength span corresponds to roughly 2235–4000 cm⁻¹, so the first selection step is to confirm that the molecular or material feature of interest lies inside this region. The next checks are required linewidth, pulse energy at the exact wavelength, detector response and compatibility of coatings, windows and fibres with the infrared band. For scanning measurements, the 1 kHz repetition rate and motorised tuning can support automated acquisition. Overall system performance will still depend on focusing optics, sample interaction, detection bandwidth and timing integration.