Stressed-lap polishing of 3.5-m f/1.5 and 1.8-m f/1.0 mirrors

Details Stressed-lap polishing of 3.5-m f/1.5 and 1.8-m f/1.0 mirrors Stressed-lap polishing of 3.5-m f/1.5 and 1.8-m f/1.0 mirrors

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992spie.1531..260a&link_type=abstract

Proc. SPIE Vol. 1531, p. 260-269, Advanced Optical Manufacturing and Testing II, Victor J. Doherty; Ed.

Physics

Scientific paper

The stressed-lap polishing technique has been developed to meet the challenge of polishing 8- m-class mirrors with highly aspheric figures to an accuracy consistent with the best ground- based telescope sites. The method is currently being demonstrated in the polishing of two primary mirrors, a 1.8-m f/1.0 ellipsoid and a 3.5-m f/1.5 paraboloid. The figure accuracies achieved at the time of writing are 43 nm rms surface error for the 1.8-m mirror, and 190 nm rms surface error for the 3.5-m mirror. Polishing is proceedings on both mirrors. In this paper we describe the process used for the 3.5-m mirror and the progress through the early stages of fabrication. We also summarize progress on the 1.8-m mirror.

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