SL230 series

SBS Compressed Picosecond DPSS Nd:YAG Lasers
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  • High brightness picosecond Nd:YAG Lasers
  • Up to 500 mJ
  • Tunable pulse duration option (120 – 1500 ps)
  • Diode pumped stable oscillator
  • High brightness picosecond Nd:YAG Lasers
  • Up to 500 mJ
  • Tunable pulse duration option (120 – 1500 ps)
  • Diode pumped stable oscillator

Features & Applications

Features

  • Diode pumped Q-switched SLM master oscillator
  • Flashlamp pumped power amplifier for up to 500 mJ pulse energy at 1064 nm
  • Advanced SBS compression produces pulses down to 120 ps duration
  • Excellent pre-pulse contrast ratio
  • Thermo stabilized second, third or fourth harmonic generator options
  • Low jitter external triggering
  • Sync pulses output with <200 ps rms jitter
  • Laser control from PC via USB or RS232 port
  • Low maintenance costs

Applications

  • Plasma research
  • Medical
  • Material ablation and deposition
  • Interferometry
  • Remote laser sensing
  • Satellite ranging

Description

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.

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 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 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

 Model SL231 2)SL234SL235
Main specifications 1)
Max. pulse energy
    at 1064 nm20 mJ250 mJ500 mJ
    at 532 nm 3)8 mJ125 mJ240 mJ
    at 355 nm 4)5 mJ70 mJ140 mJ
    at 266 nm 5)2 mJ40 mJ80 mJ
    at 213 nm 6)inquire
Pulse energy stability (StdDev) 7)
    at 1064 nm2 %1.5 %
    at 532 nm3.5 %3 %
    at 355 nm5 %4 %
    at 266 nm8 %7 %
    at 213 nminquire
Pulse duration at 1064 nm (FWHM) 8)120 ps ± 15 %150 ps ± 15 %
Pulse duration stability at 1064 nm (StdDev) 7)5 %
Repetition rate50 Hz10 Hz5 Hz
Linewidth≤ 0.2 cm-1
Polarization ratio at 1064 nm>1:100
Optical pulse jitter (StdDev) 9)0.2 ns
Beam profilenear GaussianHat-Top 10)
Beam pointing stability at 1064 nm 11)<50 µrad
Beam divergence 12)<0.5 mrad
Beam height170 ± 5 mm
Contrast ratio≥105:1
Beam diameter 13)~4 mm~10 mm~12 mm
Physical characteristics
Laser head size (W × L × H)456 × 810 × 249 mm456 × 1031 × 249 mm
Electric cabinet size (W × L × H)553 × 600 × 519 mm553 × 600 × 665 mm
Umbilical length2.5 m
Operating requirements
Water consumption (max 20 °C)<10 liters/min
Room temperature18 – 24 °C
Relative humidity10 – 80 % (non-condensing)
Power requirements208 or 380 V AC, three phase, 50/60 Hz208 or 230 V AC, single phase, 50/60 Hz
Power consumption <2 kVA<3.5 kVA<4 kVA
  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.
  2. Completely diode pumped version of SL231 is available under special request.
  3. For -SH option. Outputs are not simultaneous. Please inquire for pulse energies at other wavelengths.
  4. For -TH option. Outputs are not simultaneous. Please inquire for pulse energies at other wavelengths.
  5. For -FH option. Outputs are not simultaneous. Please inquire for pulse energies at other wavelengths.
  6. For custom -FiH option. Outputs are not simultaneous. Please inquire for pulse energies at other wavelengths.
  7. Averaged from 300 pulses.
  8. Variable pulse duration options are available with 120 – 500 ps or 500 – 1000 ps tuning range.
  9. In external triggering mode with two separate triggering pulses for flashlamps and Q-switch.
  10. Near Gaussian fit profile with lower energy is available by request.
  11. RMS value measured from 300 shots. Beam pointing stability is evaluated from fluctuations of beam centroid position in the far field.
  12. Full angle measured at the 1/e² point at 1064 nm.
  13. Beam diameter is measured at 1064 nm at the 1/e² level.

Options

Variable 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 (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.

Drawings

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