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Proceedings Paper

Optothermal stability of large ULE and Zerodur mirrors
Author(s): Thomas E. Brooks; Ron Eng; H. Phillip Stahl
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Paper 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.

Paper Details

Date Published: 17 September 2018
PDF: 16 pages
Proc. SPIE 10743, Optical Modeling and Performance Predictions X, 107430A (17 September 2018); doi: 10.1117/12.2321275
Show Author Affiliations
Thomas E. Brooks, NASA Marshall Space Flight Ctr. (United States)
Ron Eng, NASA Marshall Space Flight Ctr. (United States)
H. Phillip Stahl, NASA Marshall Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 10743:
Optical Modeling and Performance Predictions X
Mark A. Kahan; Marie B. Levine-West, Editor(s)

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