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Proceedings Paper

Research on sub-surface damage and its stress deformation in the process of large aperture and high diameter-to-thickness ratio TMT M3MP
Author(s): Hai-xiang Hu; Erhui Qi; Glen Cole; Hai-fei Hu; Xiao Luo; Xue-jun Zhang
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Paper 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.

Paper Details

Date Published: 24 October 2016
PDF: 7 pages
Proc. SPIE 9682, 8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 96820A (24 October 2016); doi: 10.1117/12.2245575
Show Author Affiliations
Hai-xiang Hu, Changchun Institute of Optics (China)
Univ. of Chinese Academy of Sciences (China)
Erhui Qi, Changchun Institute of Optics (China)
Glen Cole, TMT Observatory Corp. (United States)
Hai-fei Hu, Changchun Institute of Optics (China)
Xiao Luo, Changchun Institute of Optics (China)
Xue-jun Zhang, Changchun Institute of Optics (China)


Published in SPIE Proceedings Vol. 9682:
8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes
Myung K. Cho; Bin Fan, Editor(s)

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