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.
|MAIN SPECIFICATIONS 1)|
|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||Hat-Top (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|
|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 )|
|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|
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.