1 November 1990 Cryogenic surface distortion and hysteresis of a 50-cm-diameter fused-silica mirror cooled to 77 K
Author Affiliations +
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.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jeffrey A. Young, Jeffrey A. Young, Steven D. Howard, Steven D. Howard, Gordon C. Augason, Gordon C. Augason, Ramsey K. Melugin, 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); doi: 10.1117/12.23039; https://doi.org/10.1117/12.23039
PROCEEDINGS
11 PAGES


SHARE
Back to Top