NL940 series
datasheet
- High energy nanosecond lasers
- Temporaly shaped 3 – 10 ns pulses
- Pulse energies up to 10 J
- 10 Hz pulse repetition rate
- High energy nanosecond lasers
- Temporaly shaped 3 – 10 ns pulses
- Pulse energies up to 10 J
- 10 Hz pulse repetition rate
Features & Applications
Features
- Variable temporal pulse shape
- Up to 10 J output energy
- 10 Hz repetition rate
- 3 – 10 ns adjustable pulse duration
- 1064 or 532 nm output wavelength
- Spatial flat top beam profile
- Fiber 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 temporaly shaped pulses based on electrooptical modulator driven by programmable arbitrary waveform 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 fiber 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 single-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 used in order to get flat top shape at the output. Optional second/third harmonic generators are based on angle tuned nonlinear crystals placed in temperature stabilized heaters.
Specifications
| Model | NL944 | NL945 | NL949 |
|---|---|---|---|
| MAIN SPECIFICATIONS 1) | |||
| Pulse energy (rectangular pulse in time domain 5 ns FWHM) | |||
| at 1064 nm | 1.6 J | 5 J | 10 J |
| at 532 nm 2) | 1 J | 2.5 J | 6 J |
| 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, variable with 125 ps resolution | ||
| 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 | ~ 22 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 | 700 × 2100 × 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 × 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 | 22 ± 2 °C | ||
| Relative humidity | 20 – 80 % (non-condensing) | ||
| Power requirements 9) | 208 – 240 VAC, single phase, 50/60 Hz / 208, 380 or 400 V AC, three phases, 50/60 Hz | 208, 380 or 400 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 and for basic system without options.
- For NL94X-SH harmonic generator option. Harmonic outputs are not simultaneous; only single wavelength beam is present at the output at once. Manual reconfiguration is required to switch wavelength. Third harmonic available on request.
- 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 with 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.
- Voltage fluctuations allowed are +10 % / -15 % from nominal value. 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
Publications
Spectral pulse shaping of a 5 Hz, multi-joule, broadband optical parametric chirped pulse amplification frontend for a 10 PW laser system
Related applications: High Intensity Sources OPCPA Systems
We present a broadband optical parametric chirped pulse amplification (OPCPA) system delivering 4 J pulses at a repetition rate of 5 Hz. It will serve as a frontend for the 1.5 kJ, <150 fs, 10 PW laser beamline currently under development by a consortium of National Energetics and Ekspla. The spectrum of the OPCPA system is precisely controlled by arbitrarily generated waveforms of the pump lasers. To fully exploit the high flexibility of the frontend, we have developed a 1D model of the system and an optimization algorithm that predicts suitable pump waveform settings for a desired output spectrum. The OPCPA system is shown to have high efficiency, a high-quality top-hat beam profile, and an output spectrum demonstrated to be shaped consistently with the theoretical model.