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Proceedings Paper

Fabrication of large optical surfaces using a combination of polishing and mirror bending
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Paper Abstract

In order to reduce polishing costs and correct unexpected errors in fabrication and polishing, the support of very large optics can be actively enlisted in telescope mirror optical figure adjustment. A set of leaf springs is used by the Keck Ten-Meter Telescope to apply moments about the pivots of the mirror mosaics' whiffletree support. The springs successfully reduce the polished rms surface error by a factor of 6 to 15, while reducing the 80-percent enclosed energy diameter by a factor of 2.5-6.0. Additional current limitations on figure improvement include the difficulties of polishing higher spatial frequencies and predicting warping during mirror fabrication.

Paper Details

Date Published: 1 July 1990
PDF: 12 pages
Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, (1 July 1990); doi: 10.1117/12.19234
Show Author Affiliations
Terry S. Mast, Univ. of California/Berkeley and Lawrence Berkeley Lab. (United States)
Jerry E. Nelson, Univ. of California/Berkeley and Lawrence Berkeley Lab. (United States)

Published in SPIE Proceedings Vol. 1236:
Advanced Technology Optical Telescopes IV
Lawrence D. Barr, Editor(s)

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