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26 March 1992 Fabrication of the WIYN 3.5-m primary mirror: producing an accurate sphere
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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
© (1992) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Gary A. Poczulp, Larry M. Stepp, and John H. Richardson "Fabrication of the WIYN 3.5-m primary mirror: producing an accurate sphere", Proc. SPIE 1618, Large Optics II, (26 March 1992); https://doi.org/10.1117/12.58039
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