Cryo-stability of HB-Cesic optics

Matthias Krödel

doi:10.1117/12.895280

26 September 2011 Cryo-stability of HB-Cesic optics

Matthias Krödel

Proceedings Volume 8126, Optical Manufacturing and Testing IX; 81260I (2011) https://doi.org/10.1117/12.895280
Event: SPIE Optical Engineering + Applications, 2011, San Diego, California, United States

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.

Citation Download Citation

Matthias Krödel "Cryo-stability of HB-Cesic optics", Proc. SPIE 8126, Optical Manufacturing and Testing IX, 81260I (26 September 2011); https://doi.org/10.1117/12.895280

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