高功率激光辐照下光学天线的像质研究  

Study of optical antenna image quality under high-powerlaser irradiation

作　　者：李响[1,2] 吴东宇 孙梓庭 高亮 安岩[1,2] 宋延嵩[1,2] 董科研[1,2] LI Xiang;WU Dongyu;SUN Ziting;GAO Liang;AN Yan;SONG Yansong;DONG Keyan(College of Opto-electronic Engineering,Changchun University of Science and Technology,Changchun 130022,China;National and Local Joint Engineering Research Center of Space and Optoelectronics Technology,Changchun University of Science and Technology,Changchun 130022,China;College of Mechanical and Electrical Engineering,Changchun University of Science and Technology,Changchun 130022,China)

机构地区：[1]长春理工大学光电工程学院,吉林长春130022 [2]长春理工大学空间光电技术国家与地方联合工程研究中心,吉林长春130022 [3]长春理工大学机电工程学院,吉林长春130022

出　　处：《红外与激光工程》2024年第8期78-88,共11页Infrared and Laser Engineering

基　　金：吉林省重大科技专项课题项目(20230301002GX)。

摘　　要：离轴两反光学天线在高功率激光系统中起到改变光束直径的作用,而高功率激光加载下所产生的热效应使光学天线的像质劣化,严重影响高功率激光系统的性能。为量化其影响效果,建立了离轴两反光学天线的有限元分析模型,模拟高功率激光作用环境,完成了激光加载下的瞬态热分析以及静力学分析,并得到离轴两反光学天线激光加载时间对波前劣化的影响关系。使用齐次坐标变换的方法求解离轴主次镜的刚体位移,具体分析了各项刚体位移随加载时间的变化情况。通过Zernike多项式拟合的方法完成了镜面的波面拟合,将拟合结果导入ZEMAX中,最终得到了该光学天线在平均功率为1 000 W,重频为0.2 Hz,入光直径为30 mm的激光加载300 s下的波前均方差为0.064 6λ。为了进一步验证模型的准确性,使用较低功率(10 W)激光进行原理等效实验,结果表明光学天线在激光加载下实际波像差与模型仿真结果基本相符,偏差小于7.93%,该方法可以有效评价离轴两反天线在高功率激光加载下的像质劣化情况。Objective With the widespread development of laser technology,lasers are now extensively used in various fields such as industry,medicine,and the military.Optical antennas play a crucial role in high-energy laser transmission,and their thermal deformation has a significantly greater impact on the overall wavefront aberration than other components in the optical path.Compared to Cassegrain antennas,off-axis optical antennas have a higher level of analytical difficulty due to their parabolic mirrors rather than flat mirrors.Current research on the thermal stability of off-axis optical antennas mainly focuses on the steady-state thermal analysis of temperature variations in space.The issues of surface shape changes of the primary and secondary mirrors under transient thermal loads of high-energy lasers and the resultant changes in the distance between these mirrors also need to be addressed.Presently,there are few integrated analytical models that study the increase in wavefront aberration in off-axis optical systems caused by photothermal effects from high-energy lasers.This study focuses on off-axis two-reflector optical antennas,analyzing the changes in wavefront aberration in off-axis optical systems due to photothermal effects induced by high-energy lasers.Methods An off-axis two-reflector optical system finite element analysis model was established under the environment of high-energy laser operation.Transient thermal analysis and static analysis under laser loading were completed,and the displacement cloud map varying with laser loading time was obtained.The rigid body displacement of the off-axis primary and secondary mirrors was solved using homogeneous coordinate transformation.The wavefront fitting of the mirrors was completed using Zernike polynomial fitting.The change along the Z-axis in the rigid body displacement of the mirrors and the Zernike polynomial coefficients were imported into ZEMAX.The thermal analysis results of the off-axis two-reflector optical system were obtained under laser loading wit

关 键 词：激光光学 离轴两反光学天线 瞬态热分析 波像差 高能激光系统 激光热效应 

分 类 号：TH741[机械工程—光学工程]