Fabrication of large secondary mirrors for astronomical telescopes

Details Fabrication of large secondary mirrors for astronomical telescopes Fabrication of large secondary mirrors for astronomical telescopes

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997spie.3134...51s&link_type=abstract

Proc. SPIE Vol. 3134, p. 51-61, Optical Manufacturing and Testing II, H. Philip Stahl; Ed.

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Scientific paper

A new class of telescope is being built with primary mirrors as large as 8.4 meters in diameter and as fast as f/1. Fabricating the secondary mirrors for these telescopes has presented tough challenges because of their large sizes, up to 1.7 meter diameter; their aspheric departure of more than 300 microns; the required figure accuracy of a few tens of nanometers; and the fact that they are typically convex and difficult to measure. We have developed tools and techniques to meet these demands to produce secondary mirrors efficiently and accurately. A dedicated facility was constructed in the mirror lab that integrates a 1.8-m stressed-lap polishing machine with interferometric and mechanical measuring systems. This paper presents data from a 1.15-m secondary that was finished in our shop, and from two other large mirrors that are currently being fabricated.

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