基于边界约束改善大口径光学元件面形质量的反演研究

项目名称： 基于边界约束改善大口径光学元件面形质量的反演研究

项目编号： No.61505228

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 无线电电子学、电信技术

项目作者： 任志远

作者单位： 中国科学院上海光学精密机械研究所

项目金额： 20万元

中文摘要： 大口径光学元件的面形质量是影响光束质量重要因素之一。大口径光学元件由于加工中引入的和安装中重力作用产生的面形误差导致低阶波前畸变以及像散问题，传统解决办法是在整体光路中加入自适应光学系统进行校正，但大口径光学元件本身的光学面形质量是其实现的基础。本课题提出一种基于边界约束的大口径光学元件边缘挠性支撑新方法，在对大口径光学元件光学表面畸变PV值和RMS值进行校正的同时，还能满足大口径光学元件的全口径通光要求。本项目基于弹性力学平板变形理论，通过由光学元件面形推导边界约束方式的反演研究，建立大口径光学元件边界约束方式与面形变形的基本理论模型；在此基础上，对边界约束支撑条件下的局部应力扩散引起的应力破坏以及应力双折射问题进行较精细、较基础的研究；根据光机集成有限元优化以及实验平台实验结果，完善及修正理论模型。该理论能大幅度提高光学元件面形质量，同时突破大口径光学元件制造精度的瓶颈。

中文关键词： 激光玻璃；激光晶体；激光输出特性；高峰值功率激光；；激光效率

英文摘要： Surface quality of optical components is macroscopic characterization of the beam quality and optical field distribution. According to the wave front distortion introduced in the manufactory processing and the influence of the gravity, we develop the edge-restraint support theoretical model that is based on the theory of plate deformation to solve the contradiction between traditional support technology and the full aperture of optical component. The edge-restraint support method on the edge of optical component method is carried out with inversion research for the support theory of the optical component, and the goal of optimum support scheme is obtained with the constraint conditions of the minimum deformation for optical aperture. First of all, we study the relationship between the flexible torques, which is produced by the preload and edge flexible support position, and the modified surface shape of the optics; secondly, we develop the basic support method and theory with the stress distribute rule to implement the full aperture of the optical component. The correlation coefficient in the model applied to the engineering application is improved and revised with the integrated opto-mechanical finite element optimization and laboratory experiments. The theory is the breakthrough of bottleneck for large aperture optical components manufacture precision. At the same time, it can improve the surface quality of the large aperture optical component.

英文关键词： laser glass; laser crystal;laser output characteristic;high-power laser ;laser efficiency