双锥透镜天线整形光学系统设计  

Design of Shaping Optical System for Double-Cone Lens Antenna

作　　者：刘显著[1] 徐达 杨翘楚 孙高飞 李林 郑佳伟 彭御天 温卓奥 姜会林[1] Liu Xianzhu;Xu Da;Yang Qiaochu;Sun Gaofei;Li Lin;Zheng Jiawei;Peng Yutian;Wen Zhuoao;Jiang Huilin(Changchun University of Science and Technology,Institute of Space Ophotoelectronics Technology,Changchun 130022,Jilin,China;Beijing Institute of Control Engineering,Beijing 100190,China)

机构地区：[1]长春理工大学空间光电技术研究所,吉林长春130022 [2]北京控制工程研究所,北京100190

出　　处：《光学学报》2024年第23期194-201,共8页Acta Optica Sinica

基　　金：国家自然科学基金(62105042);光电测量与智能感知中关村开放实验室开放基金(LabSOMP-2024-16)。

摘　　要：针对卡塞格林天线系统中次镜遮拦引起的传输效率低的问题,提出一种基于双锥透镜的整形光学系统,通过双锥透镜对称放置来实现实心-空心光束的相互转换,并给出双锥透镜整形系统的设计方法。分析基于双锥透镜整形的天线系统传输效率的影响因素,推导出双锥透镜顶角倒角、倾斜、离轴和轴向位移对传输效率的影响,可以为实际工程中双锥透镜整形系统的装调和加工提供一定的技术支撑,有效提升卡塞格林天线系统的传输效率。Objective Communication systems always expect high transmit power from the aspect of energy transmission.However,the traditional Cassegrain antenna system suffers significant central energy loss when transmitting solid beams,which greatly reduces the transmission efficiency of optical antenna systems in space optical communications. To resolve the issueof low transmission efficiency caused by secondary mirror obstruction in the Cassegrain antenna system, we propose ashaping optical system based on double-cone lenses. The main principle is to achieve solid beam-hollow beaminterconversion by symmetrically placing the double-cone lenses. Compared with other Cassegrain antenna beam shapingsystems, our system has a simple structure, is easy to install and adjust, and offers improved transmission efficiency.Methods We first analyze the factors affecting transmission efficiency in the Cassegrain antenna system and exploit thebeam deflection properties of conical lenses. Two conical lenses are placed symmetrically;the first lens performs beamsplitting, while the second lens restores the beam angle based on the principle of optical path reversibility. The recoveredspot is a circular beam of a certain size. One advantage of this system is its applicability to various spectral ranges ofantenna systems, as the relative distance between components can be adjusted without changing the beam’s imaging angle.We also analyze the effects of lens tilting, off-axis displacement, and axial offset on laser transmission efficiency.Theoretical results show a transmission efficiency of 96.21%, influenced by the chamfering of the conical lens’s top angle.When the axial displacement is -0.050 mm, transmission efficiency decreases to 95.02%, and at +0.050 mm, it drops to90.65%. By controlling mounting errors, we maintain an overall transmission efficiency of more than 94%. The system’ssimplicity and versatility make it highly advantageous in engineering applications.Results and Discussions We set up a test platform consisting of a 1550

关 键 词：天线系统 卡塞格林 锥形透镜 传输效率 实心-空心光束转换 

分 类 号：O437.1[机械工程—光学工程]