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Proceedings Paper

Cryostable lightweight frit-bonded silicon mirror
Author(s): Frank M. Anthony; Douglas R. McCarter; Matt Tangedahl; David A. Content
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Paper Abstract

The excellent polishability, low density and relatively high stiffness of silicon make it an attractive candidate for optical applications that require superior performance. Assembly of silicon details by means of glass frit bonding permits significant weight reduction thus enhancing the benefit of silicon mirrors. To demonstrate the performance potential, a small lightweight glass frit bonded silicon mirror was fabricated and tested for cryostability. The test mirror was 12.5cm in diameter with a 60cm spherical radius and a maximum thickness, at the perimeter, of 2.5cm. A machined silicon core was used to stiffen the two face sheets of the silicon sandwich. These three elements were assembled, by glass frit bonding, to form the substrate that was polished. The experimental evaluation, in a liquid nitrogen cryostat, demonstrated cryostability performance significantly better than required by the mirror specification.

Paper Details

Date Published: 25 November 2002
PDF: 12 pages
Proc. SPIE 4822, Cryogenic Optical Systems and Instruments IX, (25 November 2002); doi: 10.1117/12.451712
Show Author Affiliations
Frank M. Anthony, McCarter Technology, Inc. (United States)
Douglas R. McCarter, McCarter Technology, Inc. (United States)
Matt Tangedahl, McCarter Technology, Inc. (United States)
David A. Content, NASA Goddard Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 4822:
Cryogenic Optical Systems and Instruments IX
James B. Heaney; Lawrence G. Burriesci, Editor(s)

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