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Proceedings Paper

Compensation for 6.5-K cryogenic distortion of a fused-quartz mirror by refiguring
Author(s): Gordon C. Augason; Jeffrey A. Young; Ramsey K. Melugin; Dana S. Clarke; Steven D. Howard; Michael Scanlan; Steven N. Wong; Kenneth C. Lawton
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Paper Abstract

A 46 cm diameter, lightweight, Amersil TO8E, fused-natural-quartz mirror with a single-arch cross section was tested at the NASA-Ames Research Center Cryogenic Optical Test Facility to measure its cryogenic distortion at 6.5 K. Then the mirror was refigured with the inverse of the measured cryogenic distortion to compensate for this figure defect. The mirror was retested at 6.5 K and found to have a significantly improved figure. The compensation for cryogenic distortion was not complete, but preliminary analysis indicates that the compensation was better than 0.25 waves P-V if edge effects are ignored. The feasibility of compensating for cryogenic distortion by refiguring has thus been verified.

Paper Details

Date Published: 21 January 1993
PDF: 6 pages
Proc. SPIE 1765, Cryogenic Optical Systems and Instruments V, (21 January 1993); doi: 10.1117/12.140885
Show Author Affiliations
Gordon C. Augason, NASA Ames Research Ctr. (United States)
Jeffrey A. Young, Sterling Federal Systems, Inc. (United States)
Ramsey K. Melugin, NASA Ames Research Ctr. (United States)
Dana S. Clarke, Synernet Corp. (United States)
Steven D. Howard, Synernet Corp. (United States)
Michael Scanlan, Tinsley Labs., Inc. (United States)
Steven N. Wong, Tinsley Labs., Inc. (United States)
Kenneth C. Lawton, Tinsley Labs., Inc. (United States)

Published in SPIE Proceedings Vol. 1765:
Cryogenic Optical Systems and Instruments V
Ramsey K. Melugin, Editor(s)

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