You Wang et al 2009 J. Opt. A: Pure Appl. Opt. 11 125501 doi:10.1088/1464-4258/11/12/125501
You Wang1,3, Koichi Inoue2, Hirofumi Kan1, Takayo Ogawa2 and Satoshi Wada2
Show affiliationsHow to reduce the thermally induced effects in a solid-state rod is a critical assignment for the applications of high-powered diode-pumped solid-state lasers (DPSSLs). In this paper, we study the birefringence compensation in a solid-state laser system containing two tandem-set Nd:YAG rods with different thermally induced characteristics. By reason of the uneven emission wavelengths of the pump LDs, the thermal focal length of one Nd:YAG rod is about 1.3 times as much as that of the other in our study. Using a 90° quartz rotator and a pair of coupling lenses, we investigated the depolarization dependence on different laser structures. It has been found that the birefringence in two laser rods with such different thermally induced features can be excellently reduced by adopting an optimized lens configuration which is not a traditional telescope image system as usually adopted by many researchers. Both the theoretical analyses and the experimental results have demonstrated the performance of our approach. The conclusions have been thought to be useful for constructing a high-average-power laser oscillator with a near- TEM00 mode.
42.55.Rz Doped-insulator lasers and other solid state lasers
42.60.Da Resonators, cavities, amplifiers, arrays, and rings
42.60.Lh Efficiency, stability, gain, and other operational parameters
42.60.Jf Beam characteristics: profile, intensity, and power; spatial pattern formation
Issue 12 (December 2009)
Received 6 April 2009, accepted for publication 30 July 2009
Published 21 September 2009
You Wang et al 2009 J. Opt. A: Pure Appl. Opt. 11 125501
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