Null test optics for the MMT and Magellan 6.5-m f/1.25 primary mirrors

Details Null test optics for the MMT and Magellan 6.5-m f/1.25 primary mirrors Null test optics for the MMT and Magellan 6.5-m f/1.25 primary mirrors

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994spie.2199..658b&link_type=abstract

Proc. SPIE Vol. 2199, p. 658-669, Advanced Technology Optical Telescopes V, Larry M. Stepp; Ed.

Computer Science

1

Scientific paper

The instruments used to interferometrically measure the optical surfaces of the 6.5-m f/1.25 primary mirrors for the MMT conversion and Magellan Telescopes must compensate over 800 micrometers surface departure from the best fitting sphere. The errors in the optical test must not contribute more than 0.04 arc seconds FWHM to the final image and the conic constant must be held to 0.01%. This paper presents the design, analysis, fabrication, and certification of the instruments used to measure these giant mirrors to such high accuracy.

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