1 January 1992 Stressed-lap polishing of 3.5-m f/1.5 and 1.8-m f/1.0 mirrors
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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.
© (1992) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
David S. Anderson, David S. Anderson, James Roger P. Angel, James Roger P. Angel, James H. Burge, James H. Burge, Warren B. Davison, Warren B. Davison, Scott T. DeRigne, Scott T. DeRigne, B. B. Hille, B. B. Hille, Dean A. Ketelsen, Dean A. Ketelsen, W. Cary Kittrell, W. Cary Kittrell, Hubert M. Martin, Hubert M. Martin, Robert H. Nagel, Robert H. Nagel, Thomas J. Trebisky, Thomas J. Trebisky, Steve C. West, Steve C. West, R. S. Young, 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); doi: 10.1117/12.134867; https://doi.org/10.1117/12.134867
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