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Proceedings Paper

Cryogenic Optical Tests Of A Lightweight HIP Beryllium Mirror
Author(s): R K Melugin; J. H. Miller; J. A. Young; S. D. Howard; G. M. Pryor
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Paper Abstract

Five interferometric tests were conducted at cryogenic temperatures on a lightweight, 50 cm diameter, hot isostatic pressed (HIP) beryllium mirror in the Ames Research Center (ARC) Cryogenic Optics Test Facility. The purpose of the tests was to determine the stability of the mirror's figure when cooled to cryogenic temperatures. Test temperatures ranged from room ambient to 8 K. One cycle to 8 K and five cycles to 80 K were performed. Optical and thermal test methods are described. Data is presented to show the amount of cryogenic distortion and hysteresis present in the mirror when measured with an earlier, Shack interferometer, and with a newly-acquired, phase-measuring interferometer.

Paper Details

Date Published: 27 April 1988
PDF: 8 pages
Proc. SPIE 0973, Cryogenic Optical Systems and Instruments III, (27 April 1988); doi: 10.1117/12.948340
Show Author Affiliations
R K Melugin, NASA Ames Research Center (United States)
J. H. Miller, NASA Ames Research Center (United States)
J. A. Young, Sterling Software (United States)
S. D. Howard, Information Management Inc (United States)
G. M. Pryor, Information Management Inc (United States)


Published in SPIE Proceedings Vol. 0973:
Cryogenic Optical Systems and Instruments III
Ramsey K. Melugin; Warren G. Pierce, Editor(s)

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