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Proceedings Paper

Comparison of sintered-SiC and C/SiC mirror behavior at cryogenic temperatures
Author(s): Andrea Novi; Giuseppe Mondello; Christophe Devilliers; Aldo Caso; Matthias R. Krodel; Mauro Ghigo; Christian duJeu
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Paper 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.

Paper Details

Date Published: 12 December 2003
PDF: 8 pages
Proc. SPIE 5179, Optical Materials and Structures Technologies, (12 December 2003); doi: 10.1117/12.507261
Show Author Affiliations
Andrea Novi, Galileo Avionica (Italy)
Giuseppe Mondello, Galileo Avionica (Italy)
Christophe Devilliers, Alcatel Space (France)
Aldo Caso, Bettini S.p.A. (Italy)
Matthias R. Krodel, ECM Ingenieur-Unternehmen fur Energie- und Umwelttechnik GmbH (Germany)
Mauro Ghigo, Osservatorio Astronomico di Brera (Italy)
Christian duJeu, SESO (France)

Published in SPIE Proceedings Vol. 5179:
Optical Materials and Structures Technologies
William A. Goodman, Editor(s)

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