The simulation of thermal deformation on lightweight optics with thick coatings

Guanbo Qiao; Xuejun Zhang; Weijie Deng; Haixiang Hu; Xiao Luo; Ling Xiong; Yu Yang; Tianbao Chen

doi:10.1117/12.2602014

9 August 2021 The simulation of thermal deformation on lightweight optics with thick coatings

Guanbo Qiao, Xuejun Zhang, Weijie Deng, Haixiang Hu, Xiao Luo, Ling Xiong, Yu Yang, Tianbao Chen

Proceedings Volume 11912, Pacific Rim Laser Damage 2021: Optical Materials for High-Power Lasers; 1191205 (2021) https://doi.org/10.1117/12.2602014
Event: Pacific Rim Laser Damage 2021: Optical Materials for High Power Lasers, 2021, Hangzhou, China

Abstract

Lightweight optics utilized in high-power laser system can dissipate heat better and reduce system weight. Dielectric films can be designed for laser pulse modulation, high reflect rate and wide bandwidth. However, the deformation caused by coating residual stress will be large due to the large thickness of dielectric films and low stiffness of lightweight mirror, which brings a large bending deformation with the temperature variation. The traditional surface compensation technology is double-sided coating, but it is not suitable for lightweight mirrors. In this study, we construct a finite shell-element model to estimate the surface shape error caused by dielectric film coating residual stress on a lightweight mirror for surface pre-processing. Thermal deformation and bimetal effect deformation are also simulated.

Citation Download Citation

Guanbo Qiao, Xuejun Zhang, Weijie Deng, Haixiang Hu, Xiao Luo, Ling Xiong, Yu Yang, and Tianbao Chen "The simulation of thermal deformation on lightweight optics with thick coatings", Proc. SPIE 11912, Pacific Rim Laser Damage 2021: Optical Materials for High-Power Lasers, 1191205 (9 August 2021); https://doi.org/10.1117/12.2602014

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