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Features & Applications

FEATURES

Up to 10 J output energy
10 Hz repetition rate
3 – 10 ns pulse duration
1064 or 532 nm output wavelength
Spatial flat top beam profile
Fibre front end output amplified in diode pumped regenerative amplifier

APPLICATIONS

OPCPA pumping
Front end for power amplifiers
Ti: Sapphire pumping
Laser peening – material hardening by laser-induced shock wave
Plasma and shock physics

Description

Main laser feature is output of temporary shaped pulses based on electrooptical modulator driven by programable arbitrary form generator (AWG). Pulse shaping resolution is 125 ps, while maximum pulse length is 10 ns. Start of the system is single mode CW laser. Then light is amplified in fibre amplifier, later AWG driven modulator transmits only required temporal shape and duration pulse which is amplified in diode pumped regenerative amplifier in order to reach energy sufficient to amplify in singly pass flash-lamp pumped amplifiers.

Power amplifier is a chain of single-pass amplifiers where pulse is amplified up to required energy. During amplification spatial beam shaping is emloyed in order to get flat top shape at the output. The second harmonic generator is based on angle tuned nonlinear crystal placed in a heater.

Specifications

Model	NL944	NL949
MAIN SPECIFICATIONS ¹⁾
Pulse energy (rectangular pulse in time domain 5 ns FWHM)
at 1064 nm	1600 mJ	10000 mJ
at 532 nm ²⁾	1000 mJ	6000 mJ
Pulse energy stability (StdDev): ³⁾
at 1064 nm	0.5 %
at 532 nm	1.0 %
Power drift ⁴⁾	± 2 %
Pulse duration ⁵⁾	3 – 10 ns
Repetition rate	10 Hz
Polarization at 1064 nm	vertical, > 90 %
Optical pulse jitter ⁶⁾	< 30 ps
Linewidth	< 1 cm^-1
Beam profile	Hat-Top (at laser output), without diffraction rings
Typical beam diameter ⁷⁾	~11 mm	~33 mm
Beam divergence ⁸⁾	< 0.5 mrad
Beam pointing stability	± 50 µrad
PHYSICAL CHARACTERISTICS
Laser head (W × L × H)	750 × 1350 × 300 mm	1000 × 2100 × 300 mm
Power supply unit (W × L × H)	550 × 600 × 840 mm – 1 unit 550 × 600 × 670 mm – 1 unit	550 × 600 × 1220 mm - 2 units 550 × 600 × 670 mm – 1 unit
Umbilical length	3 m
OPERATING REQUIREMENTS
Water consumption (max 20° C)	< 8 l/min	< 40 l/min
Ambient temperature	stabilized; from range 18-25 °C
Relative humidity	20-80 % (non-condensing)
Power requirements ⁹⁾	208/240 V AC, single phase 50/60 Hz or 208/380 V AC, three phases 50/60 Hz	208/380 V AC, three phases 50/60 Hz
Power consumption	5.5 kW	13.2 / 6.6 kW

Due to continuous improvement, all specifications subject to change without notice. Parameters marked typical may vary with each unit we manufacture.Unless stated otherwise, all specifications are measured at 1064 nm.
For NL94X-SH harmonics generator option. Harmonics outputs are not simultaneous; only single wavelength beam is present at the output at once. Manual reconfiguration is required to switch wavelength.
Standard deviation value averaged from 1000 shots after 20 minutes of warm-up.
Deviation from average value measured over 8 hours of operation when room temperature variation is less
than ±2 °C.
Measured with photodiode with 100 ps rise time and oscilloscope with 600 MHz bandwidth.
Standard deviation value, measured in respect to triggering pulse.
Beam diameter is measured at 1064 nm at laser output at the 1/e² level and can vary with each unit we manufacture.
Full angle measured at the 1/e² level at 1064 nm.
Mains voltage should be specified when ordering.

Performance

Typical NL949 near field beam profile at 532 nm

Example of temporal pulse shape, stability of pulse shape

Jitter measurement results