Environmental simulation evaluation of SSiC brazed optical mirrors

Yan Liu; Zhen Ma; Jian Chen; Zhongming Chen; Xuejian Liu; Zhengren Huang

doi:10.1117/12.2068140

2 September 2014 Environmental simulation evaluation of SSiC brazed optical mirrors

Yan Liu, Zhen Ma, Jian Chen, Zhongming Chen, Xuejian Liu, Zhengren Huang

Proceedings Volume 9280, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes; 928009 (2014) https://doi.org/10.1117/12.2068140
Event: 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2014), 2014, Harbin, China

Abstract

Sintered silicon carbide (SSiC) is becoming one of the most important materials for the optical mirrors due to its excellent specific stiffness (E/ρ) and demission stability (λ/α). However, it is difficult to fabricate the monolithic structure SSiC optical mirror with demission of larger than Φ1.5m because of process limitation. Joining of SSiC segments (brazing) provide a good solution to prepare large size mirror optics. However, compared with the uniform properties of the monolithic structure SSiC optical mirror, the brazed mirror is composed of two materials (SSiC segments and brazing material), so the performance of optical grinding and reliability of brazed optical mirrors become the focus. In this paper, the Φ300mm and Φ600mm brazed optical mirrors was used to evaluate the reliability of different conditions. Three kinds of environmental simulation tests, including thermal stability, thermal circle and random vibration were carried out. The evaluation results show that the temperature and vibration has no obvious effects on the surface figure (RMS) of the brazed optical mirrors.

Citation Download Citation

Yan Liu, Zhen Ma, Jian Chen, Zhongming Chen, Xuejian Liu, and Zhengren Huang "Environmental simulation evaluation of SSiC brazed optical mirrors", Proc. SPIE 9280, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 928009 (2 September 2014); https://doi.org/10.1117/12.2068140

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