Sub-nanosecond lasers - Geola - lasers and holography experts

SUBNANOSECOND PHASE CONJUGATED LASERS

Some of those our lasers are used as seeders in GSI Darmstadt - a heavy ion research center (Germany)

SBS-pulse compressed transform limited Nd:YAG / Nd:YLF lasers

The G-Sub series is family of compact DPSS or/and flash lamp pumped Nd:YAG or Nd:YLF lasers producing emissions in the sub-nanosecond regime (0.5...0.1ns). Lasers are based on temporal pulse compression by backward stimulated Brillouin scattering (SBS). This ensures narrow spectral linewidth and transform limited sub-ns pulses. The lasers produces TEM00 near diffraction limited radiation at a variety of energies, wavelengths and repetition rates. Design features include a highly stable passively or EO Q-switched oscillators and amplifiers. SuperINVAR based resonator mounting is accomplished with multi-point active temperature distribution control of laser breadboard giving output energy stability only expected with more expensive diode pumped lasers.

Typical Laser Ablation Spots and Energy Stability Diagrams

System Features

Unique cost efficient SLM Master-oscillator design based on self seeding technique
New scheme of SBS-compressor allows the formation of a smooth and diffraction-limited beam by compensation of the aberration in the wavefront which are produced by the thermally stressed lasing rod. This is known as “SBS phase-conjugation"
New scheme of SBS-compressor allows rejecting diffraction distortions introduced by the limited aperture of amplifier rod (appears as rings structure pattern). This is known as “SBS beam cleanup”
PC control via RS232 using advanced Geola software or LabView drivers (optional)
Lasers are CE marked according to IEC 60825-1:2001/EN 60825-1:2001
Low electrical consumption
Variable pulse duration available on request

Technical Parameters

Advised Model	G-SUB-x
Output Wavelength⁽¹⁾:	1064 nm	532 nm	355 nm
	1053 nm	526.5 nm	351 nm
	1047 nm	523.5 nm	349 nm
Output energy⁽²⁾:	100-500 mJ	50-240 mJ	20-140 mJ
Pulse duration FWHM⁽³⁾:	500 / 300 / 150 / 100 ps
Pulse duration stability at 1064 nm (Std. Dev.)	15 %
Energy Stability (Std.Dev.)⁽⁴⁾:	~ 2.4 %	~ 4.2 %	~ 5.4 %
Beam Divergence:	Near Diffraction Limit for beam size
Line width:	< 0.1 cm^-1
Beam Diameter (1/e²):	~ 5 ... 12 mm
Beam Profile⁽⁵⁾:	Near Gaussian or Top-Hat
Pulse Repetition Rate⁽⁶⁾:	5 ... 50 Hz
Beam Pointing:	~ 150 urad
Optical Pulse buildup time⁽⁷⁾:	< 100 ns
Polarization:	Horizontal or Vertical, > 1:100
Q-Switching Type:	Passive or E-O
Optical Pulse Jitter⁽⁸⁾:	< 5 us for Passive Q-Switch and 1 ns for E-O Q-Switch
Triggering:	External/Internal
	DIMENSIONS
Laser Head: (L x W x H)	~ 860 x 350 x 180 mm
Power & Cooling Cabinet: (L x W x H)	~ 600 x 550 x 550 mm
Umbilical Length:	3 m
	ENVIRONMENTAL REQUIREMENTS
Cooling requirements: (Water flow for 20^_oC water temperature)	< 10 liters/minute
Room temperature:	18-25^_oC (recommended)
Relative Humidity: (non-condensing)	< 70 %
Mains Voltage:	210...240 VAC, since phase 50/60 Hz
Power Consumption:	~ 2... 3.5 kW

^{(Geola reserves the right to change specifications without notice)}

⁽¹⁾ The 4th harmonic is available.

⁽²⁾ Automatic output energy attenuation available.

⁽³⁾ Variable pulse duration available.

⁽⁴⁾ Std.Dev., for 350 shots at 5Hz repetition rate.

⁽⁵⁾ Either Top-Hat or Quasi-Gaussian should be chosen on order.

⁽⁶⁾ Other repetition rates are available.

⁽⁷⁾ In respect to External sync pulse signal.

⁽⁸⁾ Std.Dev., in respect to External sync pulse signal.