Game-changing approaches to affordable advanced lightweight mirrors II: new cases analyzed for extreme ZERODUR lightweighting and relief from the classical polishing parameter constraint

Tony Hull; Thomas Westerhoff; John W. Pepi; Ralf Jedamzik; George J. Gardopee; François Piché; Andrew R. Clarkson; Antoine Leys; Martin Schaefer; Volker Seibert

doi:10.1117/12.926807

13 September 2012 Game-changing approaches to affordable advanced lightweight mirrors II: new cases analyzed for extreme ZERODUR lightweighting and relief from the classical polishing parameter constraint

Tony Hull, Thomas Westerhoff, John W. Pepi, Ralf Jedamzik, George J. Gardopee, François Piché, Andrew R. Clarkson, Antoine Leys, Martin Schaefer, Volker Seibert

Author Affiliations +

Proceedings Volume 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II; 845050 (2012) https://doi.org/10.1117/12.926807
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

Previously we established that the combination of new machining parameters for openbacked monolithic lightweighted ZERODUR® mirror substrates, coupled with new methods for optical finishing of aggressively lightweighted mirrors, have relieved classical mirror design constraints imposed upon 1.2m diameter lightweight mirrors. We demonstrate that openback mirror substrates now offer comparable mass, Eigenfrequency and substructure print-through performance to the sandwich-mirror architecture, but with considerably less manufacturing effort than for sandwich mirrors. Here we extend the analyses of the first paper from 1.2m diameter down to 0.6m in diameter and up to 2.4m diameter and 4m diameter mirrors.

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Tony Hull, Thomas Westerhoff, John W. Pepi, Ralf Jedamzik, George J. Gardopee, François Piché, Andrew R. Clarkson, Antoine Leys, Martin Schaefer, and Volker Seibert "Game-changing approaches to affordable advanced lightweight mirrors II: new cases analyzed for extreme ZERODUR lightweighting and relief from the classical polishing parameter constraint", Proc. SPIE 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II, 845050 (13 September 2012); https://doi.org/10.1117/12.926807

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