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

David S. Anderson; James Roger P. Angel; James H. Burge; Warren B. Davison; Scott T. DeRigne; B. B. Hille; Dean A. Ketelsen; W. Cary Kittrell; Hubert M. Martin; Robert H. Nagel; Thomas J. Trebisky; Steve C. West; R. S. Young

doi:10.1117/12.134867

1 January 1992 Stressed-lap polishing of 3.5-m f/1.5 and 1.8-m f/1.0 mirrors

David S. Anderson, James Roger P. Angel, James H. Burge, Warren B. Davison, Scott T. DeRigne, B. B. Hille, Dean A. Ketelsen, W. Cary Kittrell, Hubert M. Martin, Robert H. Nagel, Thomas J. Trebisky, Steve C. West, R. S. Young

Author Affiliations +

Proceedings Volume 1531, Advanced Optical Manufacturing and Testing II; (1992) https://doi.org/10.1117/12.134867
Event: San Diego, '91, 1991, San Diego, CA, United States

Abstract

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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David S. Anderson, James Roger P. Angel, James H. Burge, Warren B. Davison, Scott T. DeRigne, B. B. Hille, Dean A. Ketelsen, W. Cary Kittrell, Hubert M. Martin, Robert H. Nagel, Thomas J. Trebisky, Steve C. West, and R. S. Young "Stressed-lap polishing of 3.5-m f/1.5 and 1.8-m f/1.0 mirrors", Proc. SPIE 1531, Advanced Optical Manufacturing and Testing II, (1 January 1992); https://doi.org/10.1117/12.134867

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