多节点激光通信天线紧凑型摆镜组件设计  

Design of Compact Tip-Tilt Mirror Assembly in Multi-Node Laser Communication Antennas

作　　者：李响[1] 张立中[1] 李小明[1] 柳鸣[1] 孟立新[1] 

机构地区：[1]长春理工大学空间光电技术国家地方联合工程研究中心,吉林长春130022

出　　处：《光学学报》2017年第9期52-58,共7页Acta Optica Sinica

基　　金：国家自然科学基金(91338116)

摘　　要：为了减小多节点激光通信天线的工作包络尺寸并提高二维摆镜的运动控制精度,提出了一种紧凑型摆镜组件。采用高体分铝基碳化硅(SiC/Al)支撑板与H-K9L反射镜直接黏接的方案,提高了摆镜面形的热稳定性,摆镜回转中心至镜面的距离被缩短至20mm。黏接面采用三点薄圆环的设计,在保证摆镜组件动态刚度的前提下有效降低了黏接应力对摆镜面形的影响。有限元分析结果表明,摆镜组件的基频为1319.96Hz,在(20±5)℃工作温度范围内,面形峰谷(PV)值优于λ/4(λ=632.8nm),面形均方根(RMS)值优于λ/22。使用ZYGO激光干涉仪对摆镜的面形进行检测,结果表明,在(20±5)℃温度范围内,摆镜面形的PV值优于λ/4,RMS值优于λ/29,满足激光通信天线RMS为λ/15的指标要求。In order to reduce the working envelope size of multi-node laser communication antennas and improve the motion control accuracy of two- dimensional tip-tilt mirror, a compact mirror assembly is proposed. A scheme of directly bonding between a high volume fraction Al-based SiC （SiC/Al） supporter and a H-K9L plane mirror is adopted. The thermal stability of the tip-tilt mirror surface shape is improved, and the distance between the tip-tilt mirror assembly rotation center and the mirror surface is shortened to 20 mm. The design of three-point thin ring is used on the bonding surface. The influence of the bonding stress on the mirror surface is effectively reduced on the basis of ensuring the dynamic stiffness of the tip-tilt mirror assembly. The results of finite element analysis show that the fundamental frequency of the tip-tilt mirror assembly is 1319.96 Hz. The tip-tilt mirror surface shape peak- valley （PV） value is better than λ/4 （λ=632.8 nm） and the root mean square （RMS） value is better than λ/22 in the working temperature range of （20±5） ℃. A ZYGO laser interferometer is used for testing the mirror surface shape, and the test results show that the PV value of the tip- tilt mirror surface shape is better than λ/4 and the root mean square （RMS） value is better than λ/29 in the temperature range of （20±5） ℃. These results are better than tip-tilt mirror surface shape RMS value of λ/15 and meet the laser communication antenna requirement.

关 键 词：光通信 光学天线 二维摆镜 平面镜支撑优化 有限元分析 

分 类 号：TN929.13[电子电信—通信与信息系统]