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

Peter Blake; Ronald G. Mink; John Chambers; F. David Robinson; David Content; Pamela Davila

doi:10.1117/12.614160

25 August 2005 Cryogenic system for interferometry of high-precision optics at 20 K: design and performance

Peter Blake, Ronald G. Mink, John Chambers, F. David Robinson, David Content, Pamela Davila

Proceedings Volume 5904, Cryogenic Optical Systems and Instruments XI; 59040S (2005) https://doi.org/10.1117/12.614160
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

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.

Citation Download Citation

Peter Blake, Ronald G. Mink, John Chambers, F. David Robinson, David Content, and Pamela Davila "Cryogenic system for interferometry of high-precision optics at 20 K: design and performance", Proc. SPIE 5904, Cryogenic Optical Systems and Instruments XI, 59040S (25 August 2005); https://doi.org/10.1117/12.614160

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