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Proceedings Paper

Interferometric Phase Measurement Of Zerodur, Aluminum And SXA Mirrors At Cryogenic Temperatures
Author(s): Thomas J Magner; Richard D Barney
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Paper Abstract

A research program was undertaken to determine the surface figure error of several different types of mirrors at cryogenic temperatures. Two-inch diameter parabolic, spherical and flat mirrors were fabricated from zerodur, aluminum and a metal matrix composite of silicon carbide reinforced alumi-num (SXA). The ratio of silicon carbide to aluminum was selected so that the cofficient of thermal expansion (CTE) of the metal matrix matched electroless nickel. A liquid helium dewar was modified to add an interferometric grade window, a cold electronic shutter and a strain-free copper mirror mount. Interferometric phase measurements on each mirror mounted in the dewar were made without the window, with the window, under vacuum, at around 80K and between 10K and 24K.

Paper Details

Date Published: 18 July 1988
PDF: 10 pages
Proc. SPIE 0929, Infrared Optical Materials IV, (18 July 1988); doi: 10.1117/12.945848
Show Author Affiliations
Thomas J Magner, Goddard Space Flight Center (United States)
Richard D Barney, Goddard Space Flight Center (United States)

Published in SPIE Proceedings Vol. 0929:
Infrared Optical Materials IV
Solomon Musikant, Editor(s)

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