Comparison of sintered-SiC and C/SiC mirror behavior at cryogenic temperatures

Andrea Novi; Giuseppe Mondello; Christophe Devilliers; Aldo Caso; Matthias R. Krodel; Mauro Ghigo; Christian duJeu

doi:10.1117/12.507261

12 December 2003 Comparison of sintered-SiC and C/SiC mirror behavior at cryogenic temperatures

Andrea Novi, Giuseppe Mondello, Christophe Devilliers, Aldo Caso, Matthias R. Krodel, Mauro Ghigo, Christian duJeu

Proceedings Volume 5179, Optical Materials and Structures Technologies; (2003) https://doi.org/10.1117/12.507261
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

Abstract

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.

Citation Download Citation

Andrea Novi, Giuseppe Mondello, Christophe Devilliers, Aldo Caso, Matthias R. Krodel, Mauro Ghigo, and 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); https://doi.org/10.1117/12.507261

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