Fabrication of the WIYN 3.5-m primary mirror: producing an accurate sphere

Gary A. Poczulp; Larry M. Stepp; John H. Richardson

doi:10.1117/12.58039

26 March 1992 Fabrication of the WIYN 3.5-m primary mirror: producing an accurate sphere

Gary A. Poczulp, Larry M. Stepp, John H. Richardson

Proceedings Volume 1618, Large Optics II; (1992) https://doi.org/10.1117/12.58039
Event: Optics Rochester: SPIE's International Symposium on Imaging, Fabrication, and Competitiveness, 1991, Rochester, NY, United States

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

Citation Download Citation

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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