光致热效应的光机热集成分析方法

Opto-Thermal-Mechanical Integrated Analysis Method for Opto-Thermal Effects

在光机热集成分析过程中,引入非序列光线追迹,分析复杂光源条件下光学系统内光致热效应,利用有限元分析方法求解光学元件温度场分布及表面面型变化,构建基于Zernike多项式的基底函数对梯度折射率场进行精确拟合,进而分析得到系统的光学性能。拟合过程中通过使用对Zernike多项式赋权值的方法避免了结果的非对称性。最后以大功率激光准直扩束镜为例,进行了系统的光机热集成分析,并给出分析结果,说明了该分析方法的有效性与通用性。

The non-sequential ray-tracing is introduced to the integrated opto-thermal-mechanical method for analyzing the thermal effect of optical system under complex light source condition.The finite element analysis is used to solve the temperature field distributions of the lens and the deformations of the optical surfaces.A basis function based on the Zernike polynomials is proposed to fit the gradient index field caused by inhomogeneous temperature.Then the optical performance of the system can be obtained with higher accuracy.Weights of the Zernike polynomials are used in fitting processing to avoid the asymmetry of the results.At last,a high power laser expander is analyzed as an example.The simulation results show that the method proposed is effective and generality.