Research on sub-surface damage and its stress deformation in the process of large aperture and high diameter-to-thickness ratio TMT M3MP

Hai-xiang Hu; Erhui Qi; Glen Cole; Hai-fei Hu; Xiao Luo; Xue-jun Zhang

doi:10.1117/12.2245575

24 October 2016 Research on sub-surface damage and its stress deformation in the process of large aperture and high diameter-to-thickness ratio TMT M3MP

Hai-xiang Hu, Erhui Qi, Glen Cole, Hai-fei Hu, Xiao Luo, Xue-jun Zhang

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Proceedings Volume 9682, 8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes; 96820A (2016) https://doi.org/10.1117/12.2245575
Event: Eighth International Symposium on Advanced Optical Manufacturing and Testing Technology (AOMATT2016), 2016, Suzhou, China

Abstract

Large flat mirrors play important roles in large aperture telescopes. However, they also introduce unpredictable problems. The surface errors created during manufacturing, testing, and supporting are all combined during measurement, thus making understanding difficult for diagnosis and treatment. Examining a high diameter-to-thickness ratio flat mirror, TMT M3MP, and its unexpected deformation during processing, we proposed a strain model of subsurface damage to explain the observed phenomenon. We designed a set of experiment, and checked the validity of our diagnosis. On that basis, we theoretical predicted the trend of this strain and its scale effect on Zerodur®, and checked the validity on another piece experimentally. This work guided the grinding-polishing process of M3MP, and will be used as reference for M3M processing as well.

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Hai-xiang Hu, Erhui Qi, Glen Cole, Hai-fei Hu, Xiao Luo, and Xue-jun Zhang "Research on sub-surface damage and its stress deformation in the process of large aperture and high diameter-to-thickness ratio TMT M3MP", Proc. SPIE 9682, 8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 96820A (24 October 2016); https://doi.org/10.1117/12.2245575

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KEYWORDS

Mirrors

Polishing

Surface finishing

Thirty Meter Telescope

Abrasives

Manufacturing

Optics manufacturing

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