中国光学（中英文）2025，Vol.18Issue(1)：150-159,10.DOI:10.37188/CO.2024-0060
大口径宽温反射镜中心支撑结构设计
Design of the central support structure of a large aperture mirror with a wide working temperature
摘要
Abstract
In order to improve the communication quality of LEO-OGS laser links,commercial ground sta-tion telescopes equipped with large aperture primary mirrors must be able to withstand extreme outdoor tem-perature.A central support scheme using room-temperature vulcanizing silicone rubber was proposed for a high-precision primary mirror with an optical aperture of 500 mm.The mirror is made of microcrystal materi-al,and both of the bushing and the supporting cylinder are made of titanium alloy.A 1-mm-thick adhesive layer is used,which can effectively reduce the thermal stress inside the assembly during temperature changes while unloading the gravity of the mirror blank.The thickness and height of the adhesive layer are determ-ined by optimization.A specially designed fixture can accurately control the shape and thickness of the ad-hesive layer.The ventilation holes on the bushing promote its full solidification.Simulation analysis indic-ates that the surface shape accuracy of the primary mirror is 4.199 nm in RMS under 40 ℃ temperature vari-ation,with 13.748 nm under vertical gravity and 4.187 nm under horizontal gravity,accompanied by the maximum mirror inclination and displacement of 4.722"and 3.597 μm,and the fundamental frequency of the assembly reaches 53.45 Hz.The measured surface shape accuracy of the primary mirror is RMS 0.017λ(λ=632.8 nm).The surface can maintain high precision after extensive heat cycling tests and vacuum coating.The central support structure can significantly improve the temperature adaptability of precise mirrors and has broad application prospects in large-scale ground optoelectronic equipment.关键词
宽温反射镜/室温硫化硅橡胶/热稳定性/地基望远镜/激光通信Key words
wide working temperature mirror/room temperature vulcanized silicone rubber/thermal stabil-ity/ground-based telescope/laser communication分类
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袁健,裴思宇,霍占伟,张冠宸,张雷..大口径宽温反射镜中心支撑结构设计[J].中国光学（中英文）,2025,18(1):150-159,10.基金项目
吉林省科技发展计划资助项目(No.20210509052RQ)Supported by Science and Technology Development Plan Project of Jilin Province(No.20210509052RQ) （No.20210509052RQ）
