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Proceedings Paper

Fabrication of a fast, aspheric beryllium mirror
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Paper Abstract

A program to fabricate a large, optically fast, aspheric lightweight Be mirror has demonstrated state-of-the-art technology. The mirror blank was fabricated as a 1.0-m diameter, f/0.58 ellipse, directly from IP-70 grade powder, using near-net-shape HIPing as well as a patented tooling approach that produced a closed back, honeycomb-cored mirror weighing less than 18 kg. Details of the mirror design and of the assembly for HIPing are given. The blank was HIPed, leached and machined to final shape with all design goals met; as-HIPed, the blank was within +/- 0.5-mm in all dimensions, and the radius of curvature was within 0.2 percent of target. The mirror was loose-abrasive ground using plunge grinding with a full-size tool, then rough polished using a full-size flexible pitch lap. In-process metrology used a special swing-arm profilometer with demonstrated accuracy and repeatability below one micron.

Paper Details

Date Published: 1 September 1991
PDF: 7 pages
Proc. SPIE 1485, Reflective and Refractive Optical Materials for Earth and Space Applications, (1 September 1991); doi: 10.1117/12.46520
Show Author Affiliations
Roger A. Paquin, Hughes Danbury Optical Systems, Inc. (United States)
George J. Gardopee, Hughes Danbury Optical Systems, Inc. (United States)

Published in SPIE Proceedings Vol. 1485:
Reflective and Refractive Optical Materials for Earth and Space Applications
Max J. Riedl; Robert R. Hale; Thomas B. Parsonage, Editor(s)

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