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Proceedings Paper

Cryo-stability of HB-Cesic optics
Author(s): Matthias Krödel
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Paper Abstract

The technical requirements for large future space optics are becoming more and more challenging. This is particularly the case with respect to thermal stability under cryogenic conditions. During the past two years, ECM together with its industrial partners carried out extensive cryo-stability tests of its HB-Cesic® optical material under a range of conditions. In this paper we report the test configurations and results of two of these tests and qualification campaigns. The first of the tests was carried out with a 600-mm HB-Cesic® mirror that was polished directly without any overcoating. The second of the tests was carried out with an 800-mm HB-Cesic® mirror whose optical surface was coated with a silicon layer prior to polishing. The 600-mm mirror was tested to a cryogenic temperature of 93 K. The 800-mm mirror was tested to a cryogenic temperature of 18 K.

Paper Details

Date Published: 26 September 2011
PDF: 11 pages
Proc. SPIE 8126, Optical Manufacturing and Testing IX, 81260I (26 September 2011); doi: 10.1117/12.895280
Show Author Affiliations
Matthias Krödel, ECM Engineered Ceramic Materials GmbH (Germany)


Published in SPIE Proceedings Vol. 8126:
Optical Manufacturing and Testing IX
James H. Burge; Oliver W. Fähnle; Ray Williamson, Editor(s)

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