New method to measure the ultrashort thermal focal length of high-power solid state laser

Baigang Zhang; Jianquan Yao; Degang Xu; Yizhong Yu; Tao Wang; Jin Chen; Peng Wang

doi:10.1117/12.481758

5 September 2002 New method to measure the ultrashort thermal focal length of high-power solid state laser

Baigang Zhang, Jianquan Yao, Degang Xu, Yizhong Yu, Tao Wang, Jin Chen, Peng Wang

Proceedings Volume 4914, High-Power Lasers and Applications II; (2002) https://doi.org/10.1117/12.481758
Event: Photonics Asia, 2002, Shanghai, China

Abstract

Thermal lens effect is a very important factor in designing stable resonators for high-power solid-state laser pumped by laser diodes. In a symmetric plane-parallel resonator , if the thermal lens of the laser crystal is close to a thin lens, according to the theory of transfer matrix we can get that there is a critical hollow point where the resonator changes from stable region to unstable state, then back to stable region. So we can measure the ultrashort thermal focal length of high-power solid-state laser based on this fact. We used this method to measure the ultrashort thermal focal length of a 100W magnitude Nd:YAG laser. The experimental results have shown this is a simple and effective technique.

Citation Download Citation

Baigang Zhang, Jianquan Yao, Degang Xu, Yizhong Yu, Tao Wang, Jin Chen, and Peng Wang "New method to measure the ultrashort thermal focal length of high-power solid state laser", Proc. SPIE 4914, High-Power Lasers and Applications II, (5 September 2002); https://doi.org/10.1117/12.481758

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