Optothermal stability of large ULE and Zerodur mirrors

Thomas E. Brooks; Ron Eng; H. Phillip Stahl

doi:10.1117/12.2321275

17 September 2018 Optothermal stability of large ULE and Zerodur mirrors

Thomas E. Brooks, Ron Eng, H. Phillip Stahl

Author Affiliations +

Proceedings Volume 10743, Optical Modeling and Performance Predictions X; 107430A (2018) https://doi.org/10.1117/12.2321275
Event: SPIE Optical Engineering + Applications, 2018, San Diego, California, United States

Abstract

Marshall Space Flight Center’s (MSFC) X-ray and Cryogenic Test Facility (XRCF) has tested the optothermal stability of two low-CTE, large-aperture mirrors in a thermal vacuum chamber. The mirrors deformed from several causes such as: thermal gradients, thermal soaks, coefficient of thermal expansion (CTE) gradients, CTE mismatch, and stiction. This paper focuses on how the aforementioned conditions affected the surface figure of the large optics while in vacuum at temperatures ranging from 230 to 310 K (-43 to 37 ˚C). The presented data, conclusions, and taxonomy are useful for designing mirrors and support structures for telescopes. The data is particularly useful for telescopes that require extreme dimensional stability or telescopes that operate at a temperature far from ambient.

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Thomas E. Brooks, Ron Eng, and H. Phillip Stahl "Optothermal stability of large ULE and Zerodur mirrors", Proc. SPIE 10743, Optical Modeling and Performance Predictions X, 107430A (17 September 2018); https://doi.org/10.1117/12.2321275

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