快反镜在高功率连续激光辐照下的热性能分析  

Analysis on thermal performance of fast steering mirror irradiated by high power CW laser

作　　者：兰硕 李新南[1,4] 武春风 李梦庆 韩西萌 Lan Shuo;Li Xinnan;Wu Chunfeng;Li Mengqing;Han Ximeng(National Astronomical Observatories/Nanjing Institute of Astronomical Optics Technology,Chinese Academy of Sciences,Nanjing 210042,China;The 9th Designing Deportment of China Aerospace Science and Industry Corporation,Wuhan 430040,China;The 4th Academy of China Aerospace Science and Industry Corporation,Wuhan 430040,China;Key Laboratory of Astronomical Optics&Technology,Nanjing Institute of Astronomical Optics&Technology,Chinese Academy of Sciences,Nanjing 210042,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院国家天文台南京天文光学技术研究所,江苏南京210042 [2]中国航天科工集团第九总体设计部,湖北武汉430040 [3]中国科学院大学,北京100049 [4]中国科学院天文光学技术重点实验室,江苏南京210042 [5]中国航天科工集团第四研究院,湖北武汉430040

出　　处：《红外与激光工程》2018年第10期267-272,共6页Infrared and Laser Engineering

摘　　要：为了研究高功率连续激光辐照过程中快反镜的热性能变化问题,文中利用多物理场仿真分析软件建立了融凝石英(fused silica)、微晶(zerodur)、碳化硅(SiC)三种材料制作的快反镜传热学和结构力学耦合非稳态模型,通过泽尼克多项式算法对高功率激光辐照快反镜热应力下的光学波前进行拟合。研究结果表明:在同等激光功率辐照条件下,微晶材料制作的快反镜温升最小,形变最小。根据仿真结果优选微晶作为快反镜镜体材料,基于泽尼克多项式对快反镜波前热畸变进行仿真分析,计算得到波前热像差以活塞、球差、离焦等为主导,可为波前校正工程应用提供理论参考。In order to study the thermal characteristic of fast steering mirror during the working process of high power CW laser,a time-dependent fast steering mirror model coupled with heat transfer and structure mechanic was established to calculate the distribution of temperature,thermal deformation and thermal stress by finite element software,and the material was fused silica,zerodur and sic respectively.The wave front of fast steering mirror was fitted by Zernike polynomial algorithms.The results indicate that under the same laser power irradiation conditions,the minimum temperature rising and thermal distortion of the three material is zerodur.By comparison,zerodur material is optimized as fast steering mirror,and its dominant thermal aberration are piston,spherical aberration and defocus,which can provide wavefront correction to theoretical reference in the field of engineering application.

关 键 词：高功率连续激光 快反镜 热畸变 有限元分析 

分 类 号：TN249[电子电信—物理电子学]