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Proceedings Paper

Establishing a substrate manufacturing center for ZERODUR 4-meter diameter lightweight mirrors
Author(s): Thomas Westerhoff; Tony B. Hull; Ralf Jedamzik
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Paper Abstract

The history and application of ZERODUR® toward availability of 4-meter monolithic blanks for astronomical telescopes is summarized. Features of ZERODUR® are both its near-zero coefficient of thermal expansion with extraordinary homogeneity, and that the mirror substrate is monolithic as cast: No joining is involved. CNC machining at the SCHOTT AG facility now can fully address all shape factors of 4-meter blanks. This shaping is via efficient CNC fixed abrasive grinding. Significant improvements have been made to both the specular figure form, while minimizing sub-surface damage. These CNC methods are also used to do a high degree of lightweighting behind the face sheet of the mirror. We describe the expected material availability and lead time. Monolithic large precision mirror blanks of ZERODUR® offer performance advantages unmatched among mirror substrate materials.

Paper Details

Date Published: 25 February 2020
PDF: 10 pages
Proc. SPIE 11117, Techniques and Instrumentation for Detection of Exoplanets IX, 1111706 (25 February 2020); doi: 10.1117/12.2529811
Show Author Affiliations
Thomas Westerhoff, SCHOTT AG (Germany)
Tony B. Hull, The Univ. of New Mexico (United States)
Ralf Jedamzik, SCHOTT AG (Germany)

Published in SPIE Proceedings Vol. 11117:
Techniques and Instrumentation for Detection of Exoplanets IX
Stuart B. Shaklan, Editor(s)

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