Fabrication of a lightweight beryllium one-meter f/0.58 ellipsoidal mirror

Roger A. Paquin; George J. Gardopee

doi:10.1117/12.58043

26 March 1992 Fabrication of a lightweight beryllium one-meter f/0.58 ellipsoidal mirror

Roger A. Paquin, George J. Gardopee

Author Affiliations +

Proceedings Volume 1618, Large Optics II; (1992) https://doi.org/10.1117/12.58043
Event: Optics Rochester: SPIE's International Symposium on Imaging, Fabrication, and Competitiveness, 1991, Rochester, NY, United States

Abstract

A program to fabricate a large, optically fast, aspheric lightweight Be mirror was initiated in order to demonstrate 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 hot isostatic pressing (HIPing) and 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. The as-HIPed blank was within +/- 0.5 mm in all dimensions and the radius of curvature was within 0.2 of target. The mirror was loose-abrasive ground using plunge grinding with a full-size tool, then polished using a full-size flexible pitch lap. In-process metrology utilized a special-purpose swing-arm profilometer with demonstrated accuracy and repeatability of

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Roger A. Paquin and George J. Gardopee "Fabrication of a lightweight beryllium one-meter f/0.58 ellipsoidal mirror", Proc. SPIE 1618, Large Optics II, (26 March 1992); https://doi.org/10.1117/12.58043

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