Cryogenic surface distortion and hysteresis of a 50-cm diameter fused-silica mirror cooled to 77 K

Jeffrey A. Young; Steven D. Howard; Gordon C. Augason; Ramsey K. Melugin

doi:10.1117/12.23039

1 November 1990 Cryogenic surface distortion and hysteresis of a 50-cm-diameter fused-silica mirror cooled to 77 K

Jeffrey A. Young, Steven D. Howard, Gordon C. Augason, Ramsey K. Melugin

Author Affiliations +

Proceedings Volume 1340, Cryogenic Optical Systems and Instruments IV; (1990) https://doi.org/10.1117/12.23039
Event: 34th Annual International Technical Symposium on Optical and Optoelectronic Applied Science and Engineering, 1990, San Diego, CA, United States

Abstract

A 50 cm diameter, lightweight, Amersil TO8E, fused-natural-quartz mirror with a single arch cross section was tested at the NASA/Ames Research Center Cryogenic Optics Test Facility to measure cryogenic distortion and hysteresis. The mirror was cooled to 77 K in four serial tests and the mirror figure was measured with a phase-measuring interferometer. On the basis of the repeatability of room temperature and cryogenic optical measurements, it was determined that the Single Arch Mirror had no measurable hysteresis and displayed repeatable cryogenic distortion. The Cryogenic Optics Test Facility, optical and thermal test methods, test results, and measurement accuracy are described.

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Jeffrey A. Young, Steven D. Howard, Gordon C. Augason, and Ramsey K. Melugin "Cryogenic surface distortion and hysteresis of a 50-cm-diameter fused-silica mirror cooled to 77 K", Proc. SPIE 1340, Cryogenic Optical Systems and Instruments IV, (1 November 1990); https://doi.org/10.1117/12.23039

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