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Proceedings Paper

Fabrication and testing of large flats
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Paper Abstract

Flat mirrors of around 1 meter are efficiently manufactured with large plano polishers and measured with Fizeau interferometry. We have developed technologies and hardware that allow fabrication and testing of flat mirrors that are much larger. The grinding and polishing of the large surfaces uses conventional laps driven under computer control for accurate and systematic control of the surface figure. The measurements are provided by a combination of a scanning pentaprism test, capable of measuring power and low order irregularity over diameters up to 8 meters, and subaperture Fizeau interferometry. We have developed a vibration insensitive Fizeau interferometer with 1 meter aperture and software to optimally combine the data from the subaperture tests. These methods were proven on a 1.6 m flat mirror that was finished to 6 nm rms irregularity and 11 nm rms power.

Paper Details

Date Published: 14 September 2007
PDF: 15 pages
Proc. SPIE 6671, Optical Manufacturing and Testing VII, 667107 (14 September 2007); doi: 10.1117/12.736775
Show Author Affiliations
Julius Yellowhair, Sandia National Labs. (United States)
Peng Su, College of Optical Sciences/The Univ. of Arizona (United States)
Matt Novak, College of Optical Sciences/The Univ. of Arizona (United States)
Jim Burge, College of Optical Sciences/The Univ. of Arizona (United States)

Published in SPIE Proceedings Vol. 6671:
Optical Manufacturing and Testing VII
James H. Burge; Oliver W. Faehnle; Ray Williamson, Editor(s)

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