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Proceedings Paper

Optical Performance Of Replica Beryllium Mirrors
Author(s): Joel L. Shady; Charles M. Packer; Rao R. Nimmagadda
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Paper Abstract

The optical performance of physical vapor deposited beryllium mirrors replicated from tantalum-10 tungsten, molybdenum, and stainless steel master molds is being investigated. In this developmental replication process, a carbon release agent and then a layer of beryllium oxide are deposited on the master mold prior to beryllium deposition for crack-free mirror separation of the mirror from the master mold. The correlation of both optical figure and bidirectional reflectance distribution function (BRDF) between the beryllium mirrors and the master molds from which they were replicated is being experimentally determined. The reflectance of the mirrors replicated from the various master mold materials has been tested. Finally, thermal cycling of the replicated mirrors at cryogenic temperatures produces little change in BRDF values, but the optical figure changes indicate the need to remove the residual stress in the current replica beryllium mirrors. This technology development effort may lead to the fabrication of high-quality, low-scatter beryllium mirrors at a reasonable production rate.

Paper Details

Date Published: 30 June 1989
PDF: 11 pages
Proc. SPIE 1050, Infrared Systems and Components III, (30 June 1989); doi: 10.1117/12.951443
Show Author Affiliations
Joel L. Shady, U.S. Army Strategic Defense Command (United States)
Charles M. Packer, Lockheed Missiles and Space Company (United States)
Rao R. Nimmagadda, Lockheed Missiles and Space Company (United States)

Published in SPIE Proceedings Vol. 1050:
Infrared Systems and Components III
Robert L. Caswell, Editor(s)

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