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SONG Chang-xiao, YU Xin, BAI Su-ping, JIANG Dong-xu, LIU Cai, GUAN Miao-xin, HAN Jia-hao. Design of Athermalization Optical Machine Structure for Optical Axis Stability Detection System[J]. Chinese Optics. doi: 10.37188/CO.2023-0226
Citation: SONG Chang-xiao, YU Xin, BAI Su-ping, JIANG Dong-xu, LIU Cai, GUAN Miao-xin, HAN Jia-hao. Design of Athermalization Optical Machine Structure for Optical Axis Stability Detection System[J]. Chinese Optics. doi: 10.37188/CO.2023-0226

Design of Athermalization Optical Machine Structure for Optical Axis Stability Detection System

doi: 10.37188/CO.2023-0226
Funds:  Supported by National Natural Science Foundation of China Youth Foundation Grant (No. 62205032); Jilin Science and Technology Development Project (No. 20210201139GX); Changchun University of Science and Technology Youth Fund (No. XQNJJ-2019-01)
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  • Corresponding author: baisp@126.com
  • Received Date: 18 Dec 2023
  • Rev Recd Date: 09 Jan 2024
  • Accepted Date: 26 Feb 2024
  • Available Online: 10 May 2024
  • The alignment accuracy of the emitting and receiving optical axis of laser communication equipment in the satellite ground field is crucial. Temperature fluctuation can cause deformations of optical components and mechanical structures, affecting the alignment of optical axis and reducing the detection accuracy of the system. This article designs a high-precision optical axis stability system for detection. According to the technical requirements of broadband and conjugate imaging, an off-axis reflective Keplerian telescope system with image transfer is designed to compress the beam. After passing through a beam splitter, the beams enter the detection subunit separately. A long focal length optical axis stability detection system is designed to improve detection accuracy. To correct the thermal difference of the reflective system, an optical passive non-thermalization technique is employed using a refractive mirror group to compensate for the thermal-induced aberration of the reflective mirror group. The mechanical structure is designed and subjected to finite element analysis. Finite element data are processed and fed back into optical software to simulate the optical axis deviation angle caused by temperature fluctuation. Finally, experiments are conducted for validation. The results show that the optical axis stability detection system has an optical axis deviation angle of 3.90" at −10 °C and 4.23" at 45 °C, reducing the impact of temperature fluctuation on optical axis deviation.

     

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