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17 September 2018 Optothermal stability of large ULE and Zerodur mirrors
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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.
Conference Presentation
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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