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SL230 series Picosecond SBS Compressed Nd:YAG Lasers

SL230 series lasers are excellent solution for applications, where high energy picosecond pulses are needed. Not like conventional mode-locked lasers that typically use 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.

Features

  • Diode pumped Q-switched SLM master oscillator
  • Flashlamp pumped power amplifier for up to 250 mJ pulse energy at 1064 nm
  • Advanced SBS compression produces pulses down to 100 ps duration
  • Up to 50 Hz pulse repetition rate
  • Excellent pre-pulse contrast ratio
  • Thermo stabilized second, third or fourth harmonic generator options
  • Low jitter external triggering
  • Pre-trigger option produces sync pulses with <200 ps rms jitter
  • Laser control from PC via USB port
  • Simple and reliable design
  • Low maintenance costs

Applications

  • Plasma research
  • Medical
  • Material ablation and deposition
  • Holography
  • Remote laser sensing
  • Satellite ranging
  • OPCPA pumping

 

SL 200 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 SL200 series lasers employ backward-stimulated Brillouin scattering (SBS) in liquid for the same purpose.

Innovative design

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 in 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 100 ps duration. After SBS compression, pulse is directed to multi-pass flashlamp pumped power amplifier for amplification to up to 250 mJ pulse energy.
Some versions, like SL230 and SL231 are available with diode pumped power amplifier. Thermocontrolled harmonics 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.

Simple and convenient laser control

Laser is controlled by PC via USB port with application for Windows™ operating system. In addition, major settings of laser can be controlled through user‑friendly remote control pad. The remote pad features a backlit display that is easy to read even while wearing laser safety eyewear.

Specifications 1)

Model SL230 SL231 SL232 SL233 SL234
Max. pulse energy:
  at 1064 nm 5 mJ 20 mJ 90 mJ 150 mJ 250 mJ
  at 532 nm 2) 2 mJ 8 mJ 40 mJ 70 mJ 125 mJ
  at 355 nm 3) 1.5 mJ 5 mJ 25 mJ 40 mJ 80 mJ
  at 266 nm 4) 0.5 mJ 2 mJ 10 mJ 15 mJ 25 mJ
  at 213 nm 5) - 1 mJ 4 mJ 10 mJ 15 mJ
Pulse energy stability (StdDev) 6)
  at 1064 nm 3 % 2 % 1.5 %
  at 532 nm 5 % 3.5 % 3 %
  at 355 nm 8 % 5 % 4 %
  at 266 nm 10 % 8 % 7 %
  at 213 nm - 10 % 10 %
Pulse duration at 1064 nm (FWHM) 7) 100 ± 15 ps
Pulse duration stability at 1064 nm (StdDev) 6) 5 %
Repetition rate 50 Hz 10 Hz 8) 10 Hz 9)
Linewidth ≤ 0.1 cm-1
Polarization ratio at 1064 nm >1:100
Optical pulse jitter 10) 0.2 ns rms
Beam profile near Gaussian Hat Top11
Beam pointing stability at 1064 nm 12) <50 µrad
Beam divergence 13) <0.5 mrad
Beam height 180 ± 5 mm
Contrast ratio at 1064 nm ≥105:1
Beam diameter 14) ~4 mm ~5 mm ~8 mm ~10 mm ~12 mm
Physical characteristics
Laser head size (W x L x H) 15) 452 x 810 x 260 mm 452 x 1010 x 260 mm
Electric cabinet size (W x L x H) 553 x 600 x 665 mm
Umbilical length 2.5 m
Operating requirements
Water consumption (max 20 °C) <10 liters/min
Room temperature 18-24 °C
Relative humidity 10-80 % (non-condensing)
Power requirements 16) 208 or 230 V AC, single phase, 50-60 Hz 208 or 380 V AC, three phase, 50-60 Hz
Power consumption <2 kVA <1.5 kVA <2.5 kVA <3.5 kVA <3.5 kVA
Model SL230 SL231 SL232 SL233 SL234

1) Due to continuous improvement, all specifications are subject to change without notice. Parameters marked typical are not specifications. 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) For -SH option. Outputs are not simultaneous. Please inquire for pulse energies at other wavelengths.
3) For -TH option. Outputs are not simultaneous. Please inquire for pulse energies at other wavelengths.
4) For -FH option. Outputs are not simultaneous. Please inquire for pulse energies at other wavelengths.
5) For -FiH option. Outputs are not simultaneous. Please inquire for pulse energies at other wavelengths.
6) Averaged from 300 pulses.
7) Variable pulse duration options are available with 120-500 ps or 500-1000 ps tuning range.
8) Models with pulse repetition rates up to 50 Hz are available.
9) Models with pulse repetition rates up to 20 Hz are available.
10) In external triggering mode with two separate triggering pulses for flashlamps and Q-switch. Low jitter sync pulse available for user equipment triggering.
11) Improved Gaussian fit profile is available by request.
12) RMS value measured from 300 shots.
13) Full angle measured at the 1/e² point at 1064 nm.
14) Beam diameter is measured at 1064 nm at the 1/e² point.
15) Models with 213 nm output, feature length equal to 1024 mm.
16) Three phase 208 or 380 VAC mains are required for 20 or 50 Hz versions.

Pulse duration options -VPx and -VPCx

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 or laser control pad.

Note. Certain specifications may change when the laser is configured for variable pulse duration. Contact Ekspla for detailed data sheets.