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Proceedings Paper

ZERODUR for stress mirror polishing
Author(s): Ralf Jedamzik; Clemens Kunisch; Thomas Westerhoff
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Paper Abstract

Stress mirror polishing is considered as one of several polishing technologies for the generation of the aspherical shaped primary mirror segments of the thirty meter telescope (TMT). For stress mirror polishing it is essential to precisely know the elastic response of glass ceramic substrate materials under a given deformation load. In the past it was experimentally shown that glass ceramics do not respond instantaneously to loading and unloading conditions, this effect was called "delayed elasticity." Recently SCHOTT has shown that it is possible to use a model to predict the characteristic thermal expansion behaviour of individual ZERODUR® batches for a given temperature profile. A similar approach will be used to predict the delayed elastic behavior of ZERODUR® under time dependent loads. In this presentation the delayed elasticity effect of ZERODUR® is reviewed. The delayed elastic response of the material to load conditions is shown and discussed. First results of a model approach based on experimental results and tools that have been built up for the modelling of the delayed elasticity effect of ZERODUR® will be presented.

Paper Details

Date Published: 26 September 2011
PDF: 11 pages
Proc. SPIE 8126, Optical Manufacturing and Testing IX, 812606 (26 September 2011); doi: 10.1117/12.894421
Show Author Affiliations
Ralf Jedamzik, SCHOTT AG (Germany)
Clemens Kunisch, SCHOTT AG (Germany)
Thomas Westerhoff, SCHOTT AG (Germany)

Published in SPIE Proceedings Vol. 8126:
Optical Manufacturing and Testing IX
James H. Burge; Oliver W. Fähnle; Ray Williamson, Editor(s)

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