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Features & Applications

FEATURES

Integrates DPSS pump laser and OPO into a single housing
Dry, no water inside!
Hands-free no-gap wavelength tuning from 335 to 2600 nm *
1000 Hz pulse repetition rate
More than 1.1 mJ output pulse energy in NIR
1 – 4 ns pulse duration
Remote control via key pad or PC

* Automatic wavelength scan is optional

APPLICATIONS

Photoacoustic imaging
Laser-induced fluorescence spectroscopy
Pump-probe spectroscopy
Photobiology
Remote sensing
Metrology

BENEFITS

Hands-free wavelength tuning – no need for physical intervention
High repetition rate (1000 Hz) enables fast data collection
End diode pumping and water-free technology ensure high reliability and low maintenance costs
Superior tuning resolution (1 – 2 cm⁻¹) allows recording of high quality spectra
High integration level saves valuable space in the laboratory
In-house design and manufacturing of complete systems, including pump lasers, guarantees on-time warranty and post warranty services and spares supply
Variety of control interfaces: USB, RS232, LAN and WLAN ensures easy control and integration with other equipment
Attenuator and fiber coupling options facilitate incorporation of NT250 systems into various experimental environments

Description

NT250 series tunable laser systems integrates into a single compact housing a nanosecond Optical Parametric Oscillator (OPO) and Diode-Pumped Solid-State (DPSS) Q-switched pump laser.

Diode pumping enables fast data acquisition at high pulse repetition rates up to 1 kHz while avoiding frequent flashlamp changes that are common when flashlamp pumped lasers are used. Special cooling technology eliminates the need for tap water, thus further reducing running and maintenance costs.

All lasers feature motorized tuning across the specified tuning range. The output wavelength can be set from control pad with backlit display that is easy to read even while wearing laser safety glasses. Alternatively, the laser can be also controlled from personal computer using supplied LabVIEW™ drivers.

High conversion efficiency, stable output, easy maintenance and compact size make our systems excellent choice for many applications.

Accessories and Optional Items

Option	Feature
-SH	Tuning range extension in UV range (335 – 670 nm) by second harmonic generation
-H, -2H	1064 and 532 nm output via separate port
-FC	Fiber coupler
-Attn	Attenuator option

Specifications

Model	NT252
OPO ¹⁾
Wavelength range
Signal	670 – 1064 nm
Idler	1065 – 2600 nm
SH	335 – 669 nm
Pulse energy
OPO ²⁾	1100 µJ
SH ³⁾	200 µJ
Pulse duration ⁴⁾	1 – 4 ns
Pulse repetition rate	1000 Hz
Linewidth ⁵⁾	<10 cm^-1
Tuning resolution ⁶⁾
Signal	1 cm⁻¹
Idler	1 cm⁻¹
SH	2 cm⁻¹
Polarization
Signal	horizontal
Idler	vertical
SH	horizontal
Typical beam diameter ^{7) 8)}	3 × 6 mm
PUMP LASER
Pump wavelength ⁹⁾	532 nm
Typical pump pulse energy ¹⁰⁾	4 mJ
Pulse duration ¹¹⁾	2 – 5 ns
Pulse energy stability (StdDev)	< 2.5 %
PHYSICAL CHARACTERISTICS
Unit size (W × L × H)	456 × 1040 × 297 mm
Power supply size (W × L × H)	520 × 400 × 286 mm
Umbilical length	2.5 m
OPERATING REQUIREMENTS
Cooling	air-cooled
Room temperature	18 – 27 °C
Relative humidity	20 – 80 % (non-condensing)
Power requirements	100 – 240 V AC, single phase 50/60 Hz
Power consumption	<1.5 kW
Cleanliness of the room	not worse than ISO Class 9

Due to continuous improvement, all specifications are subject to change. Parameters marked typical are illustrative; they are indications of typical performance and will vary with each unit we manufacture. Unless stated otherwise, all specifications are measured at 750 nm and for basic system without options.
Measured at maximum in the interval 700 – 750 nm. See tuning curves for typical outputs at other wavelengths.
Measured at 400 nm. See tuning curves for typical outputs at other wavelengths.
Measured at FWHM level with photodiode featuring 1 ns rise time and 300 MHz bandwidth oscilloscope.
In signal and idler range.
For manual input from PC. When wavelength is controlled from keypad, tuning resolution is 0.1 nm for signal, 1 nm for idler and 0.05 nm for SH.
Measured at the wavelength indicated in the “Pulse energy” specification row.
Beam diameter is measured at the 1/e² level at the laser output and can vary depending on the pump pulse energy.
Separate output port for the 2nd and other harmonic are optional.
The pump laser pulse energy will be optimized for best OPO performance. The actual pump laser output can vary with each unit we manufacture.
Measured at FWHM level with photodiode featuring 1 ns rise time and 300 MHz bandwidth oscilloscope.

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.