Thermal analysis of high-power solid state laser with a Gaussian heat density deposition

Wenjie Xie; Siu Chung Tam; Hongru Yang; Jianhui Gu; Gang Zhao; Yee Loy Lam; Chan Hin Kam

doi:10.1117/12.368508

4 November 1999 Thermal analysis of high-power solid state laser with a Gaussian heat density deposition

Wenjie Xie, Siu Chung Tam, Hongru Yang, Jianhui Gu, Gang Zhao, Yee Loy Lam, Chan Hin Kam

Proceedings Volume 3898, Photonic Systems and Applications in Defense and Manufacturing; (1999) https://doi.org/10.1117/12.368508
Event: International Symposium on Photonics and Applications, 1999, Singapore, Singapore

Abstract

Development of high power solid state laser makes us notice that thermal conductivity and heat expansion coefficient of laser crystal are not constant as temperature is increased. When we assume the heat density in the laser crystal is uniform, the temperature and stress profiles are on- quadratic, and the temperature and stress in laser crystal are higher than those we treat thermal conductivity and heat expansion coefficient as constants. Actually, it is difficult to achieve uniform heat density. We apply end- pumping geometry to side-pumping geometry, and assume the heat density in any cross section of the laser crystal rod is Gaussian profile. Then optical to optical efficiency will be very high due to excellent overlap between optical pumping volume and mode volume. We simulated the temperature and stress profiles in this situation using finite element analysis.

Citation Download Citation

Wenjie Xie, Siu Chung Tam, Hongru Yang, Jianhui Gu, Gang Zhao, Yee Loy Lam, and Chan Hin Kam "Thermal analysis of high-power solid state laser with a Gaussian heat density deposition", Proc. SPIE 3898, Photonic Systems and Applications in Defense and Manufacturing, (4 November 1999); https://doi.org/10.1117/12.368508

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