NL740 series

Ultra-stable Nanosecond Laser
Download
datasheet
  • Nanosecond laser providing superior pulse temporal and spatial stability
  • Up to 100 mJ at 1064 nm
  • Up to 100 Hz repetition rate
  • 3 – 10 ns scalable pulse duration
  • Nanosecond laser providing superior pulse temporal and spatial stability
  • Up to 100 mJ at 1064 nm
  • Up to 100 Hz repetition rate
  • 3 – 10 ns scalable pulse duration

Features & Applications

Features

  • Narrow bandwidth, stable, true SLM pulses
  • Excellent pulse energy (typically 0.1 % StDev @ 1064 nm) and pulse duration stability
  • Excellent spatial mode stability
  • Excellent output power stability (typically < ±0.5 % peak-to-peak)
  • 3  –  10 ns tunable pulse duration
  • Up to 100 mJ output energy
  • Up to 100 Hz repetition rate
  • 1064, 532 nm or 355 nm output wavelength
  • Reliable 24/7 operation

Applications

  • Metrology, especially Laser-Induced Damage Threshold (LIDT)
  • Front end for power amplifiers
  • Interferometry and holography
  • Material processing and others

Description

The main feature of NL740 series is the output of ultra-stable tunable duration (2 – 10 ns) narrow bandwidth nanosecond pulses based on temporally driven CW diode laser seeder and amplification stages.

Start of the system is the single mode DFB laser with temporal output power modulator. Such front-end ensures reliable generation of SLM mode that is highly beneficial for formation of low temporal modulation ultra-stable pulses. Then light is amplified in diode pumped regenerative amplifier in order to reach energy sufficient to amplify in diode pumped amplifiers.

Power amplifier is a chain of double pass amplifiers where pulse is amplified up to 100 mJ energy at 100 Hz repetition rate. Before amplification spatial beam shaping is employed in order to get flat top shape at the output. The harmonic generators are based on angle tuned nonlinear crystals placed in a heater. All diode pumped design ensures reliable operation of system at high repetition rates as well as simple and convenient maintenance.

Specifications

ModelNL740NL742
MAIN SPECIFICATIONS 1)
Pulse energy (for 5 ns pulse 5))
    at 1064 nm2 mJ100 mJ
    at 532 nm 2)NA50 mJ
    at 355 nm 2)NA30 mJ
Pulse energy stability (StdDev) 3)
    at 1064 nm< 0.5 %
    at 532 nm< 1.0 %
    at 355 nm< 1.5 %
Power drift 4)± 2 %
Pulse duration 5)3 – 10 ns
Repetition rate100 Hz
Polarization at 1064 nmvertical, > 98 %
Optical pulse jitter 6)< 150 ps
Linewidth< 0.1 cm⁻¹
Beam profileGaussianHat-Top (at laser output), without diffraction rings
Typical beam diameter 7)~2 mm~5 mm
Beam divergence 8)1.0 mrad0.7 mrad
Beam pointing stability (StdDev)< 30 µrad
PHYSICAL CHARACTERISTICS
Laser head (W × L × H)456 × 1031 × 249 mm600 × 1200 × 330 mm
Power supply unit (W × L × H)85 × 170 × 41 mm520 × 500 × 210 mm
Umbilical length2.5 m ( other length on request )
OPERATING REQUIREMENTS
Coolingair-cooledair-cooled chiller
Ambient temperaturestabilized; from range 18 – 25 °C
Relative humidity20 – 80 % (non-condensing)
Power requirements 9)100 – 240 V AC, single phase 50/60 Hz
Power consumption< 200 W< 1.5 kW
  1. 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 1064 nm.
  2. Harmonic outputs are not simultaneous; only single wavelength beam is present at the output at once. Manual reconfiguration is required to switch wavelength.
  3. Standard deviation value averaged from pulses, emitted during 30 sec time interval after 20 minutes of warm-up.
  4. Deviation from average value measured over 8 hours of operation when room temperature variation is less than ±2 °C.
  5. FWHM. Measured with photodiode with 100 ps rise time and oscilloscope with 600 MHz bandwidth.
  6. Standard deviation value, measured with respect to triggering pulse.
  7. Beam diameter is measured at 1064 nm at laser output at the 1/e² level.
  8. Full angle measured at the 1/e² level at 1064 nm.
  9. Mains voltage should be specified when ordering.

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.

Performance

Send request about NL740