Compensation of thermal lensing effect and TEM00-mode generation in cw Nd:YAG lasers

Won Kweon Jang; Seong Sook Shin; Sungman Lee

doi:10.1117/12.505378

3 November 2003 Compensation of thermal lensing effect and TEM₀₀-mode generation in cw Nd:YAG lasers

Won Kweon Jang, Seong Sook Shin, Sungman Lee

Proceedings Volume 5175, Laser Beam Shaping IV; (2003) https://doi.org/10.1117/12.505378
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

Abstract

The thermally induced birefringence was successfully compensated by placing a quarter-wave plate into a plane parallel Nd:YAG laser resonator of 130 W output power in multi-mode. The optimal conversion efficiency was 38.3% and the slope efficiency was 58.2% with output coupler of 80% reflectance, and the beam quality factor of M² was 26.7. For higher modes elimination, an aperture of 1.5 mm in diameter was inserted into resonator, and M² was decreased to 1.8. However, the insertion of quarter-wave plate made an additional improvement to 1.15 of M² value by alternating their radial and tangential polarization directions every bouncing feedback. We report the experimental results with theoretical analysis for high power solid-state laser fabrication with better beam quality.

Citation Download Citation

Won Kweon Jang, Seong Sook Shin, and Sungman Lee "Compensation of thermal lensing effect and TEM₀₀-mode generation in cw Nd:YAG lasers", Proc. SPIE 5175, Laser Beam Shaping IV, (3 November 2003); https://doi.org/10.1117/12.505378

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