Establishing a substrate manufacturing center for ZERODUR 4-meter diameter lightweight mirrors

Thomas Westerhoff; Tony B. Hull; Ralf Jedamzik

doi:10.1117/12.2529811

25 February 2020 Establishing a substrate manufacturing center for ZERODUR 4-meter diameter lightweight mirrors

Thomas Westerhoff, Tony B. Hull, Ralf Jedamzik

Proceedings Volume 11117, Techniques and Instrumentation for Detection of Exoplanets IX; 1111706 (2020) https://doi.org/10.1117/12.2529811
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

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.

Citation Download Citation

Thomas Westerhoff, Tony B. Hull, and Ralf Jedamzik "Establishing a substrate manufacturing center for ZERODUR 4-meter diameter lightweight mirrors", Proc. SPIE 11117, Techniques and Instrumentation for Detection of Exoplanets IX, 1111706 (25 February 2020); https://doi.org/10.1117/12.2529811

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