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Proceedings Paper

Cryogenic surface distortion and hysteresis of a 50-cm diameter fused-silica mirror cooled to 77 K
Author(s): Jeffrey A. Young; Steven D. Howard; Gordon C. Augason; Ramsey K. Melugin
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Paper 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.

Paper Details

Date Published: 1 November 1990
PDF: 11 pages
Proc. SPIE 1340, Cryogenic Optical Systems and Instruments IV, (1 November 1990); doi: 10.1117/12.23039
Show Author Affiliations
Jeffrey A. Young, Sterling Federal Systems, Inc. (United States)
Steven D. Howard, Synernet Corp. (United States)
Gordon C. Augason, NASA/Ames Research Ctr. (United States)
Ramsey K. Melugin, NASA/Ames Research Ctr. (United States)

Published in SPIE Proceedings Vol. 1340:
Cryogenic Optical Systems and Instruments IV
Ramsey K. Melugin; Gerald R. Pruitt, Editor(s)

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