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Proceedings Paper

Fabrication of the WIYN 3.5-m primary mirror: producing an accurate sphere
Author(s): Gary A. Poczulp; Larry M. Stepp; John H. Richardson
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Paper Abstract

The National Optical Astronomy Observatories has been working to extend existing fabrication techniques necessary to polish and figure large, steeply curved, structured borosilicate glass mirrors to exceedingly close tolerances. This paper describes the generation, grinding, and polishing techniques used to transform a 3.5 m diameter, f/1.75, glass casting into a precision spherical surface. The accuracy of the finished sphere was 0.52 (lambda) peak- to-valley and 0.066 (lambda) (42 nm) rms

Paper Details

Date Published: 26 March 1992
PDF: 11 pages
Proc. SPIE 1618, Large Optics II, (26 March 1992); doi: 10.1117/12.58039
Show Author Affiliations
Gary A. Poczulp, National Optical Astronomy Observatories (United States)
Larry M. Stepp, National Optical Astronomy Observatories (United States)
John H. Richardson, National Optical Astronomy Observatories (United States)

Published in SPIE Proceedings Vol. 1618:
Large Optics II
Robert E. Parks, Editor(s)

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