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Proceedings Paper

Lightweight instrument mirrors from single-crystal silicon
Author(s): Vincent T. Bly; Maria D. Nowak; David O. Moore
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Paper Abstract

We describe a process for fabricating lightweight mirrors from single crystal silicon. We also report ambient and cryogenic test results on a variety of mirrors made by this process. Each mirror is a monolithic structure from a single crystal of silicon. Masses are typically 1/3rd to 1/4th that of an equal diameter solid quartz mirror. We avoid print through of the supporting structure by lightweighting after the optical surface has been formed. Because of the extraordinary homogeneity of single crystal silicon, distortion of the optical surface by the lightweighting process is negligible for most applications (<1/40th wave RMS @ 633nm). This homogeneity also accounts for the near zero distortion at cryogenic temperatures.

Paper Details

Date Published: 14 June 2006
PDF: 10 pages
Proc. SPIE 6265, Space Telescopes and Instrumentation I: Optical, Infrared, and Millimeter, 62652O (14 June 2006); doi: 10.1117/12.672210
Show Author Affiliations
Vincent T. Bly, NASA Goddard Space Flight Ctr. (United States)
Maria D. Nowak, NASA Goddard Space Flight Ctr. (United States)
David O. Moore, Bullen Ultrasonics, Inc. (United States)

Published in SPIE Proceedings Vol. 6265:
Space Telescopes and Instrumentation I: Optical, Infrared, and Millimeter
John C. Mather; Howard A. MacEwen; Mattheus W. M. de Graauw, Editor(s)

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