Interferometric Phase Measurement Of Zerodur, Aluminum And SXA Mirrors At Cryogenic Temperatures

Thomas J Magner; Richard D Barney

doi:10.1117/12.945848

18 July 1988 Interferometric Phase Measurement Of Zerodur, Aluminum And SXA Mirrors At Cryogenic Temperatures

Thomas J Magner, Richard D Barney

Proceedings Volume 0929, Infrared Optical Materials IV; (1988) https://doi.org/10.1117/12.945848
Event: 1988 Technical Symposium on Optics, Electro-Optics, and Sensors, 1988, Orlando, FL, United States

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.

Citation Download Citation

Thomas J Magner and Richard D Barney "Interferometric Phase Measurement Of Zerodur, Aluminum And SXA Mirrors At Cryogenic Temperatures", Proc. SPIE 0929, Infrared Optical Materials IV, (18 July 1988); https://doi.org/10.1117/12.945848

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