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Proceedings Paper

Ultra-Lightweight Fused Silica Mirrors For A Cryogenic Space Optical System
Author(s): John W. Pepi; Richard J. Wollensak
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Paper Abstract

The design of ultra-lightweight mirrors for large optical space systems is necessitated by spacecraft payload capabilities. The weight of supporting structure is in turn lessened as the optical element weights decrease. Lightweight mirror design, however, must be shown capable of inducing minimal distortion error response from the severe environment of a typical orbital mission. Such includes on-board vibration, gravity release, and a cryogenic operational temperature often below 100°K. Further, the optical elements must withstand the extreme loadings of a launch environment. As such, the mirrors must exhibit excellent stiffness, strength, and thermal expansion characteristics, particularly so in a passive (non-correctable error) system. A symmetrical, fused silica glass lightweight design, composed of fused facesheets and core, which meets these design requirements is presented. The fabrication and manufacturing processes utilized to accomplish the design and its objectives are also discussed.

Paper Details

Date Published: 27 September 1979
PDF: 7 pages
Proc. SPIE 0183, Space Optics II, (27 September 1979); doi: 10.1117/12.957406
Show Author Affiliations
John W. Pepi, Itek Corporation (United States)
Richard J. Wollensak, Itek Corporation (United States)

Published in SPIE Proceedings Vol. 0183:
Space Optics II
Charles L. Wyman, Editor(s)

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