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Features & Applications

FEATURES

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

APPLICATIONS

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

Description

The NT340 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 extensions

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 Options

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

Model ¹⁾	NT342A	NT342B	NT342C
OPO
Wavelength range ²⁾
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
Polarization
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	&kt; 0.6 mrad
Pulse energy stability (Std.Dev)	< 3.5 %
Pulse repetition rate	10 or 20 Hz ¹⁴⁾	10 or 20 Hz	10 Hz
Physical characteristics
Unit size (W × L × H) ¹⁵⁾	452 × 800 × 270 mm
Power supply size (W × L × H)	330 × 490 × 585 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)
Mains voltage	208 or 240 V AC, single phase 50/60 Hz
Power consumption ¹⁷⁾	1.8 / 3.4 kVA

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 450 nm.
Hands-free tuning range is from 192 nm to 2600 nm.
Tuning range extension to 400 – 709 nm is optional.
Measured at 450 nm. See tuning cur ves for typical outputs at other wavelengths.
Measured at 260 nm. See tuning curves for typical outputs at other wavelengths.
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.
Measured at 200 nm.
Linewidth is <8 cm⁻¹ for 210 – 409 nm range.
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.
FWHM measured with photodiode featuring 1 ns rise time and 300 MHz bandwidth oscilloscope.
Beam diameter is measured at 450 nm at the FWHM level and can vary depending on the pump pulse energy.
Full angle measured at the FWHM level at 450 nm.
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.
30 Hz version is available. Inquire for pulse energy specifications.
Length from 821 to 1220 mm depending on configuration.
At 10 Hz pulse repetition rate. Air cooled power supply is available.
At 10/20 Hz pulse repetition rate.

Performance & Drawings

Typical output energy of the NT342 series tunable wavelength systems

Typical output energy of the NT342 series tunable wavelength systems with SH/DUV extension

Typical far field beam profile of NT342 laser

NT342 series laser head typical outline drawing. Unit length and port position vary depending on model

Ordering information

NT342 series tunable laser ordering