Passively Cooled Laser Gain Modules

For QCW DPSSL gain module gain distribution, pumping efficiency and life time are three most important indices. The gain distribution has two effects on beam quality. On one hand the energy density distribution sets the distribution of the gain and the non-uniform gain distribution result in changes of intensity distribution in near field; On the other hand thermal effect in the gain medium cannot be ignored at high frequency. Uniform energy density means uniform heat density and the wave-front distortion is parabolic, which can be regarded as a lens and compensated easily. While non-uniform energy density results in high order distortion which is hard compensated for and reduces the focusing ability of the beam. In multi-pass amplifier these effects come worse.

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Description

A heart of Diode-Pumped Solid-State (DPSS) lasers or laser amplifiers are Laser Gain Modules (pump chamber). By evolving laser gain modules, Geola Digital can provide DPSS laser gain modules based on Vertical Cavity Surface Emitting Laser (VCSEL) pumping engine technology. Our DPSS laser gain module engines assures uniform gain distribution, high pumping efficiency and long-life time. We have two types of gain modules, namely Water cooled gain modules and Passively cooled gain modules. Typical air cooled DPSS Gain modules can be applicable for Nd:YAG Master Oscillator or Nd:YAG laser amplifier. The customized gain modules can be also provided on request.

Typical Passively Cooled Laser Gain Models^*

Gain Model No.	Rod Diameter, mm	Chip Quantity, pcs	Pump Power at 200 μs, W	Typical Output Energy, mJ^**
SLD-4×3-4	∅4	12	1800	> 90 mJ
SLD-4×4-4	∅4	16	2400	> 120 mJ
SLD-4×5-4	∅4	20	3000	> 150 mJ
SLD-4×6-4	∅4	24	3600	> 180 mJ
SLD-4×7-4	∅4	28	4200	> 210 mJ
SLD-4×8-5	∅5	32	4800	> 288 mJ
SLD-4×10-5	∅5	40	6000	> 360 mJ

*Specifications marked ‘typical’ are indications of typical performance and will vary with each unit we manufacture

**Data measured at 200us, 20Hz in a 250mm Plano-Plano cavity with T=20% output coupler.

Main Advantages

Wide operation temperature range -20 ℃ — +75 ℃
High temperature working up to 75℃
Low wavelength shift (0.07 nm/K)
Up to >20G shots life-time
Uniform pumping distribution
Good power/size form factor

Application

Gain module for air cooled DPSS master oscillator
Gain module for air cooled DPSS Nd:YAG laser amplifier
Gain module for potential military application

+370 521 32737

info@geola.com