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Proceedings Paper

Cryogenic system for interferometry of high-precision optics at 20 K: design and performance
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Paper Abstract

This report describes the facility and experimental methods at the Goddard Space Flight Center Optics Branch for the measurement of the surface figure of cryogenically-cooled spherical mirrors using standard phase-shifting interferometry, with a standard uncertainty below 2nm rms. Two developmental silicon carbide mirrors were tested: both were spheres with radius of curvature of 600 mm, and clear apertures of 150 mm. The mirrors were cooled within a cryostat, and the surface figure error measured through a fused-silica window. The GSFC team developed methods to measure the change in surface figure with temperature (the cryo-change) with a combined standard uncertainty below 1 nm rms. This paper will present the measurement facility, methods, and uncertainty analysis.

Paper Details

Date Published: 25 August 2005
PDF: 12 pages
Proc. SPIE 5904, Cryogenic Optical Systems and Instruments XI, 59040S (25 August 2005); doi: 10.1117/12.614160
Show Author Affiliations
Peter Blake, Goddard Space Flight Ctr. (United States)
Ronald G. Mink, Goddard Space Flight Ctr. (United States)
John Chambers, Goddard Space Flight Ctr. (United States)
F. David Robinson, Goddard Space Flight Ctr. (United States)
Orbital Sciences Corp. (United States)
David Content, Goddard Space Flight Ctr. (United States)
Pamela Davila, Goddard Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 5904:
Cryogenic Optical Systems and Instruments XI
James B. Heaney; Lawrence G. Burriesci, Editor(s)

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