The research of Φ1400mm SiC mirror for fabrication, test and alignment

Liangjie Feng; Gangyi Zou; Guorui Ren; Wei Wang

doi:10.1117/12.2605024

13 December 2021 The research of Φ1400mm SiC mirror for fabrication, test and alignment

Liangjie Feng, Gangyi Zou, Guorui Ren, Wei Wang

Proceedings Volume 12070, 10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirror and Telescopes; 120700G (2021) https://doi.org/10.1117/12.2605024
Event: Tenth International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2021), 2021, Chengdu, China

Abstract

A Φ1400mm silicon carbide (SiC) mirror assembly was designed according to the requirement of the mass and the optical surface distortion. The parameters of the light-weighted open-back primary mirror were optimized by finite element analysis. Six flexure bipods were designed to support the mirror edge in 12 points evenly. 12 floating anti-gravity supports were used to Minimize the optical surface distortion caused by gravity effect to obtain the real optical surface during polishing. The mirror was precisely assembled with the bipods supports and the Carbon fiber reinforcement plastic (CFRP) chamber. The optical test with interferometer showed that the surface distortion was less than 0.03λ (λ=632nm) RMS with ±5°C temperature variation and 1g gravity condition, and the mass was 145kg, which coincided with the FEA results.

Citation Download Citation

Liangjie Feng, Gangyi Zou, Guorui Ren, and Wei Wang "The research of Φ1400mm SiC mirror for fabrication, test and alignment", Proc. SPIE 12070, 10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirror and Telescopes, 120700G (13 December 2021); https://doi.org/10.1117/12.2605024

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