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Proceedings Paper

ZERODUR: progress in CTE characterization
Author(s): Ralf Jedamzik; Clemens Kunisch; Thomas Westerhoff
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Paper Abstract

In 2010, SCHOTT introduced a method for the modeling of the thermal expansion behavior of ZERODUR® under arbitrary temperature profiles for an optimized production of material for the upcoming Extremely Large Telescope (ELT) projects. In 2012 a new product was introduced based on this method called ZERODUR® TAILORED. ZERODUR® TAILORED provides an evolution in the specification of the absolute Coefficient of Thermal Expansion (CTE) value by including the individual customer requirements in this process. This paper presents examples showing the benefit of an application oriented approach in the design of specifications using ZERODUR®. Additionally it will be shown how the modeling approach has advanced during the last years to improve the prediction accuracy on long time scales. ZERODUR® is known not only for its lowest CTE but also for its excellent CTE homogeneity as shown in the past for disc shaped blanks typical for telescope mirror substrates. Additionally this paper presents recent results of CTE homogeneity measurements in the single digit ppb/K range for a rectangular cast plate proving that the excellent CTE homogeneity is independent of the production format.

Paper Details

Date Published: 26 September 2013
PDF: 11 pages
Proc. SPIE 8860, UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts VI, 88600P (26 September 2013); doi: 10.1117/12.2022445
Show Author Affiliations
Ralf Jedamzik, SCHOTT AG (Germany)
Clemens Kunisch, SCHOTT AG (Germany)
Thomas Westerhoff, SCHOTT AG (Germany)

Published in SPIE Proceedings Vol. 8860:
UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts VI
Howard A. MacEwen; James B. Breckinridge, Editor(s)

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