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

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

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992spie.1618...30p&link_type=abstract

Proc. SPIE Vol. 1618, p. 30-40, Large Optics II, Robert E. Parks; Ed.

Physics

Optics

Scientific paper

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.

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