Physics – Optics
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992spie.1618...61p&link_type=abstract
Proc. SPIE Vol. 1618, p. 61-70, Large Optics II, Robert E. Parks; Ed.
Physics
Optics
Scientific paper
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 < 1 (lambda) at 0.63 micrometers . The surface quality of the mirror was characterized by measuring the BRDF at 3.39 micrometers .
Gardopee George J.
Paquin Roger A.
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