SL230 series lasers are excellent solution for applications, where high energy picosecond pulses are needed. Not like conventional mode-locked lasers that typically uses saturable nonlinear absorption or Kerr lensing to produce ultrafast pulses, the SL230 series lasers employ backward-stimulated Brillouin scattering (SBS) in liquid for the same purpose.
Diode pumped electro-optically Q-switched single longitudinal mode (SLM) nanosecond generator is the heart of the system. It provides nanosecond optical pulse that is later compressed during SBS in a special cell.
Q-switched master oscillator allows precise external triggering with jitter of less than 0.2 ns rms while mode-locked lasers typically have jitters of at least of tens of nanoseconds or even worse. Precise sync pulses from internal delay generator are also available with less than 200 ps rms jitter with respect to optical pulse.
Pulse compression is done in SBS‑cell. The geometry of interaction is designed to produce shortest and most stable pulses with 120 ps duration.
After SBS compression, pulse is directed to multi-pass flashlamp pumped power amplifier for amplification to up to 500 mJ pulse energy. Completely diode pumped version of SL231 is available under special request.
Thermocontrolled harmonic generators, based on angle-tuned KD*P and KDP crystals and harmonic separation optics are available as standard options. Each wavelength has a separate output port.
Build in energy monitors continuously monitors output pulse energy. Data from the energy monitor can be seen on the remote keypad or on PC screen. Power supply and cooling units are mounted into standard 19” rack.
Laser is controlled by PC via USB port with application for Windows™ operating system. In addition, major settings of laser can be controlled through remote control pad. The remote pad features a backlit display that is easy to read even while wearing laser safety eyewear.
|MAIN SPECIFICATIONS 1)|
|Max. pulse energy|
|at 1064 nm||20 mJ||250 mJ||500 mJ|
|at 532 nm 3)||8 mJ||125 mJ||240 mJ|
|at 355 nm 4)||5 mJ||70 mJ||140 mJ|
|at 266 nm 5)||2 mJ||40 mJ||80 mJ|
|at 213 nm 6)||inquire|
|Pulse energy stability (StdDev) 7)|
|at 1064 nm||2 %||1.5 %|
|at 532 nm||3.5 %||3 %|
|at 355 nm||5 %||4 %|
|at 266 nm||8 %||7 %|
|at 213 nm||inquire|
|Pulse duration at 1064 nm (FWHM) 8)||120 ps ± 15 %||150 ps ± 15 %|
|Pulse duration stability at 1064 nm (StdDev) 7)||5 %|
|Repetition rate||50 Hz||10 Hz||5 Hz|
|Linewidth||≤ 0.2 cm-1|
|Polarization ratio at 1064 nm||>1:100|
|Optical pulse jitter (StdDev) 9)||0.2 ns|
|Beam profile||near Gaussian||Hat-Top 10)|
|Beam pointing stability at 1064 nm 11)||<50 µrad|
|Beam divergence 12)||<0.5 mrad|
|Beam height||170 ± 5 mm|
|Contrast ratio||≥105 : 1|
|Beam diameter 13)||~4 mm||~10 mm||~12 mm|
|Laser head size (W × L × H)||456 × 810 × 249 mm||456 × 1031 × 249 mm|
|Electric cabinet size (W × L × H)||553 × 600 × 519 mm||553 × 600 × 665 mm|
|Umbilical length||2.5 m|
|Water consumption (max 20 °C)||<10 liters/min|
|Room temperature||18 – 24 °C|
|Relative humidity||10 – 80 % (non-condensing)|
|Power requirements||208 or 380 V AC, three phase, 50/60 Hz||208 or 230 V AC, single phase, 50/60 Hz|
|Power consumption||<2 kVA||<3.5 kVA||<4 kVA|
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.
SL series lasers offer a unique capability for tuning pulse duration. The tuning is done by changing the geometry of interaction in the SBS compressor. Two tuning ranges – 120 – 500 ps (option -VP1) and 500 – 1000 ps (option -VP2) – are available as standard options.
While the -VPx option requires manual tuning of optical layout components for pulse duration change, the -VPCx option provides motorized tuning that allows a change in pulse duration from a personal computer (purchased separately) or laser control pad.
Note. Certain specifications may change when the laser is configured for variable pulse duration. Contact Ekspla for detailed data sheets.