23 October 1995 Interferometric measurements of silicon carbide mirrors at liquid helium temperature
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Abstract
This paper presents the results of interferometric tests of two silicon carbide mirrors tested at room temperature and 6 K. The first mirror has a spherical f/1.73 surface, a diameter of 170 mm, and is of solid, plano-concave construction. The other mirror, a plano measuring 308 mm by 210 mm, is of lightweighted, closed-back construction. The mirrors were manufactured by the Vavilov State Optical Institute, St. Petersburg, Russia, and were loaned to Lockheed for these tests. Optical tests on both mirrors were performed using the Lockheed cryogenic optical test facility at liquid helium temperature and a Zygo Mark II interferometer. There was no change in the surface figure of the mirrors, within the test uncertainty of approximately plus or minus 0.02 waves at 0.6328-micrometer wavelength.
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Paul N. Robb, Paul N. Robb, Lynn W. Huff, Lynn W. Huff, Paul B. Forney, Paul B. Forney, Gury Timofeevic Petrovsky, Gury Timofeevic Petrovsky, Sergey V. Ljubarsky, Sergey V. Ljubarsky, Yuri P. Khimitch, Yuri P. Khimitch, "Interferometric measurements of silicon carbide mirrors at liquid helium temperature", Proc. SPIE 2543, Silicon Carbide Materials for Optics and Precision Structures, (23 October 1995); doi: 10.1117/12.225289; https://doi.org/10.1117/12.225289
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