Ultra-stable Nanosecond Laser
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.
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
SPECIFICATIONS 1)
Model
NL740
NL742
Pulse energy (for 5 ns pulse 5))
at 1064 nm
2 mJ
100 mJ
at 532 nm 2)
NA
50 mJ
at 355 nm 2)
NA
30 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 rate
100 Hz
Polarization at 1064 nm
vertical, > 98 %
Optical pulse jitter 6)
< 150 ps
Linewidth
<0.1 cm⁻¹
Beam profile
Gaussian
Top-Hat (at laser output), without diffraction rings
Typical beam diameter 7)
~2 mm
~5 mm
Beam divergence 8)
1.0 mrad
0.7 mrad
Beam pointing stability (StdDev)
< 30 µrad
PHYSICAL CHARACTERISTICS
Laser head (W × L × H)
456 × 1031 × 249 mm
600 × 1200 × 330 mm
Power supply unit (W × L × H)
85 × 170 × 41 mm
520 × 500 × 210 mm
Umbilical length
2.5 m ( other length on request )
OPERATING REQUIREMENTS
Cooling
air-cooled
air-cooled chiller
Ambient temperature
stabilized; from range 18 – 25 °C
Relative humidity
20 – 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 and for basic system without options.
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
PERFORMANCE
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.
商品属性 [波长] 1064nm/532nm/355nm [脉宽] 3-10ns [重复频率] 100Hz [单脉冲能量] 100mJ/50mJ/30mJ