Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Design of All-SiC Lightweight Secondary and Tertiary Mirrors for Use in Spaceborne Telescopes

  • Bae, Jong-In (Department of Nanoscience and Technology, Jeonbuk National University) ;
  • Lee, Haeng-Bok (Electro-optics Department, Agency for Defense Development) ;
  • Kim, Jeong-Won (Material Development Division, Orange E&C) ;
  • Kim, Myung-Whun (Department of Nanoscience and Technology, Jeonbuk National University)
  • Received : 2021.10.11
  • Accepted : 2021.11.17
  • Published : 2022.02.25
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Abstract

We report on the design of the secondary and the tertiary mirrors used in lightweight assemblies made entirely of silicon carbide (SiC). The essential design points are weight reduction within the acceptable deformation of the mirror surface by gravity release, temperature change, and vibration during or after space launch. To find a design that achieves the target requirements, we established finite element models for various candidate designs and subjected each one to wave front error analyses along gravity directions and in operation temperatures. We also calculated the natural frequencies of the candidate assemblies. Our study suggested that a triangular cell with bipod flexure support can satisfy the target weight within the requirements.

Keywords

Acknowledgement

National University Development Project of Jeonbuk National University in 2020.

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