摘要
基于有限元Comsol Multiphysics软件,模拟计算了长时间出光条件下反射镜的温度分布和热变形分布。对热变形引起的波像差采用前65阶Zernike模式分解,计算了不同时刻对应的光束质量因子,结果表明:光束质量因子主要来源于离焦像差的贡献,其他像差的影响可以忽略。在此基础上建立了光束质量因子与辐照时间的指数拟合关系,其均方根误差为0.0052。
The temperature field and thermal deformation distributions of mirror under laser long-time irradiation are calculated and analyzed by using Comsol Multiphysics software. After presenting the wave aberration of mirror with the first 65 order Zernike polynomials, the beam quality factor β at different time is obtained. The results show that beam quality factor β is mainly composed of defocusing aberration, while other aberrations can be neglected. Then an exponential relationship between beam quality factor and laser irradiation time is offered with the value 0. 0052 of room-mean-square error.
出处
《激光与光电子学进展》
CSCD
北大核心
2013年第12期182-186,共5页
Laser & Optoelectronics Progress
