Parameters for mirror selection:  trades between glass ceramics, glass, metals, ceramics and cordierites

Tony B. Hull; Janina Krieg; Thomas Westerhoff; Ralf Jedamzik

doi:10.1117/12.2562542

16 December 2020 Parameters for mirror selection: trades between glass ceramics, glass, metals, ceramics and cordierites

Tony B. Hull, Janina Krieg, Thomas Westerhoff, Ralf Jedamzik

Author Affiliations +

Proceedings Volume 11443, Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave; 1144365 (2020) https://doi.org/10.1117/12.2562542
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Abstract

A process to converge on selection of the most efficient spaceborne mirror substrate material is described. While parametric descriptors of structural efficiency and resilience to transient response have been used for this purpose over decades, significant parameter revisions are now possible with heightened precision of measuring characteristics that dominate thermal stability, principally coefficient of thermal expansion. An updated parametric diagram of materials will be presented for initial evaluation in the context of space environments and prescribed optical performance. Other important material factors that next enter the selection are heritage, mirror or size, homogeneity, isotropy, fracture mechanics, richness of design data and of course schedule and cost. SCHOTT has established ZERODUR® fabrication facilities to provide newest CNC generation of a full range of optical surface forms, and to enable advanced lightweighting up to 4 meters diameter.

Conference Presentation

Citation Download Citation

Tony B. Hull, Janina Krieg, Thomas Westerhoff, and Ralf Jedamzik "Parameters for mirror selection: trades between glass ceramics, glass, metals, ceramics and cordierites", Proc. SPIE 11443, Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave, 1144365 (16 December 2020); https://doi.org/10.1117/12.2562542

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