12 December 2003 Comparison of sintered-SiC and C/SiC mirror behavior at cryogenic temperatures
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In view of the NIRSpec-JWST program, a trade-off study is currently in progress under an ESA-ESTEC contract, to select design, blank materials, coatings and relevant technologies for high quality mirrors operating at cryogenic temperatures. The behavior of two prototype lightweight mirrors, made in cold- pressed-sintered SiC and in Carbon-SiC (Cesic) are compared by interferometric measurements at 20 K. The prototypes are spherical mirrors, but realized using optical manufacturing technologies suitable for highly demanding aspherics (i.e. computer controlled polishing, ion beam figuring), in the perspective of the foreseen NIRSpec-TMA(s) optics.
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Andrea Novi, Giuseppe Mondello, Christophe Devilliers, Aldo Caso, Matthias R. Krodel, Mauro Ghigo, Christian duJeu, "Comparison of sintered-SiC and C/SiC mirror behavior at cryogenic temperatures", Proc. SPIE 5179, Optical Materials and Structures Technologies, (12 December 2003); doi: 10.1117/12.507261; https://doi.org/10.1117/12.507261

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