Factors that favor ZERODUR mirror substrates for Astro2020’s IR/O/UV future flagship

Tony Hull; Janina Krieg; Ralf Jedamzik; Peter Hartmann; Antoine Carre; Thomas Westerhoff

doi:10.1117/12.2630201

27 August 2022 Factors that favor ZERODUR mirror substrates for Astro2020’s IR/O/UV future flagship

Tony Hull, Janina Krieg, Ralf Jedamzik, Peter Hartmann, Antoine Carre, Thomas Westerhoff

Proceedings Volume 12180, Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave; 121805O (2022) https://doi.org/10.1117/12.2630201
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Abstract

IR/O/UV’s astrophysics imposes highest requirements on the stability of mirrors filling 6-m in aperture. We will discuss success factors and ZERODUR^®’s singular ability to address these, both for a 6-m monolith and for 6-m segmented mirror. Not only low CTE over a large temperature range, but also extreme homogeneity of CTE is needed. Homogeneity is best achieved with a monolithic substrate, without bonding or fusing of different melts. For a segmented approach, methods refined for making 949 ZERODUR^® segments of the ELT ensure unparalleled consistency of pieceto-piece material characteristics.

Citation Download Citation

Tony Hull, Janina Krieg, Ralf Jedamzik, Peter Hartmann, Antoine Carre, and Thomas Westerhoff "Factors that favor ZERODUR mirror substrates for Astro2020’s IR/O/UV future flagship", Proc. SPIE 12180, Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave, 121805O (27 August 2022); https://doi.org/10.1117/12.2630201

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