Evaluation of thermally-induced lens of a pentagonal-side-pumped solid-state laser rod

Jiawei Guo; Feng Yang; Xiaoxu Liu; Juhong Han; Kepeng Rong; Guofei An; He Cai; Hongyuan Wang; You Wang

doi:10.1117/12.2543845

12 March 2020 Evaluation of thermally-induced lens of a pentagonal-side-pumped solid-state laser rod

Jiawei Guo, Feng Yang, Xiaoxu Liu, Juhong Han, Kepeng Rong, Guofei An, He Cai, Hongyuan Wang, You Wang

Proceedings Volume 11437, 2019 International Conference on Optical Instruments and Technology: Advanced Laser Technology and Applications; 114370E (2020) https://doi.org/10.1117/12.2543845
Event: 2019 International Conference on Optical Instruments and Technology, 2019, Beijing, China

Abstract

LD-side-pumping schemes for a solid-state laser offer the advantages of both high pump efficiency and high output power. However, thermally-induced lens has been known to severely affect the performance of high-powered solid-state lasers. To solve the problem, a systematic simulation model was developed by combining two procedures of ray tracing and finite element method (FEM) together to explore the thermal lens characteristics of a high-powered Nd:YAG laser. The relationship between the spatial heat density distribution and thermally-induced refractive index distribution was investigated by taking an inhomogeneous pentagonal pumping into account. The influence of a pentagonal pumping on the characteristics of the thermal lens focal length of a laser rod was studied afterwards. According to the results, if the volume average heat density of a laser rod is kept as a constant, the focal lengths of a thermally-induced lens in the pentagonal pumped laser rods will be shorter than those of the homogeneously pumped laser rods with different rod diameters. It has also been demonstrated that the focal lengths of both pumping cases are not sensitive to the variation of the rod diameter. The study is thought to be helpful for the design of a high-powered solid-state laser.

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Jiawei Guo, Feng Yang, Xiaoxu Liu, Juhong Han, Kepeng Rong, Guofei An, He Cai, Hongyuan Wang, and You Wang "Evaluation of thermally-induced lens of a pentagonal-side-pumped solid-state laser rod", Proc. SPIE 11437, 2019 International Conference on Optical Instruments and Technology: Advanced Laser Technology and Applications, 114370E (12 March 2020); https://doi.org/10.1117/12.2543845

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KEYWORDS

Nd:YAG lasers

Absorption

Refractive index

Rod lasers

Solid state lasers

Ray tracing

Finite element methods

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