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Proceedings Paper • Open Access

Highly light-weighted ZERODUR mirror and fixation for cryogenic applications

Paper Abstract

Space telescopes require large primary mirrors within a demanding thermal environment: observatories at L2 orbit provide a stable environment with a drawback of very low temperature. Besides, it is necessary to limit as far as possible the mirrors mass while withstanding launch loads and keeping image quality within a cryogenic environment.

ZERODUR is a well-known material extensively used for large telescope. Alcatel Alenia Space and Sagem/REOSC have combined their respective skills to go further in the lightweighting ratio of large mirror (36 kg/m2 on 1.5 m2) through a detailed design, performance assessment and technology demonstration with breadboards.

Beyond on a large mirror detailed design supported by analysis, a ZERODUR mock-up has been manufacturing by Sagem/REOSC to demonstrate the achievability of the demanding parameters offering this high lightweighting ratio.

Through the ISO experience on mirror attachments, a detailed design of the mirror fixation has been done as well. A full size mock-up has been manufactured and successfully tested under thermal cycling and static loading.

Eventually, the ZERODUR stability behavior within this large temperature range has been verified through thermal cycling and image quality cryotest on a flat mirror breadboard.

These developments demonstrate that ZERODUR is a good candidate for large space cryogenic mirrors offering outstanding optical performances associated to matured and proven technology and manufacturing process.

Paper Details

Date Published: 21 November 2017
PDF: 7 pages
Proc. SPIE 10567, International Conference on Space Optics — ICSO 2006, 1056717 (21 November 2017); doi: 10.1117/12.2308175
Show Author Affiliations
Stephanie Behar-Lafenetre, Alcatel Alenia Space (France)
Thierry Lasic, Alcatel Alenia Space (France)
Roger Viale, Alcatel Alenia Space (France)
Eric Ruch, Sagem Defense Securite (France)

Published in SPIE Proceedings Vol. 10567:
International Conference on Space Optics — ICSO 2006
Errico Armandillo; Josiane Costeraste; Nikos Karafolas, Editor(s)

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