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Proceedings Paper

Game-changing approaches to affordable advanced lightweight mirrors II: new cases analyzed for extreme ZERODUR lightweighting and relief from the classical polishing parameter constraint
Author(s): Tony Hull; Thomas Westerhoff; John W. Pepi; Ralf Jedamzik; George J. Gardopee; François Piché; Andrew R. Clarkson; Antoine Leys; Martin Schaefer; Volker Seibert
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Paper 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.

Paper Details

Date Published: 13 September 2012
PDF: 10 pages
Proc. SPIE 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II, 845050 (13 September 2012); doi: 10.1117/12.926807
Show Author Affiliations
Tony Hull, L-3 Integrated Optical Systems (United States)
Thomas Westerhoff, SCHOTT AG (Germany)
John W. Pepi, L-3 Integrated Optical Systems (United States)
Ralf Jedamzik, SCHOTT AG (Germany)
George J. Gardopee, L-3 Integrated Optical Systems (United States)
François Piché, L-3 Integrated Optical Systems (United States)
Andrew R. Clarkson, L-3 Integrated Optical Systems (United States)
Antoine Leys, SCHOTT North America, Inc. (United States)
Martin Schaefer, SCHOTT AG (Germany)
Volker Seibert, SCHOTT North America, Inc. (United States)


Published in SPIE Proceedings Vol. 8450:
Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II
Ramón Navarro; Colin R. Cunningham; Eric Prieto, Editor(s)

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