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Proceedings Paper

Optimizing ZERODUR mirror substrate fabrication processes for efficient optical fabrication
Author(s): Tony Hull; Thomas Westerhoff; Ralf Jedamzik
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Paper Abstract

From the systems perspective, best mirror substrate production will also concurrently streamline subsequent optical finishing. SCHOTT, recognizing that machining processes are substantially faster at material removal than optical processes, now generates aspheric surfaces to high accuracy, while reducing patterned errors from tool path, and also substantially reduces sub-surface damage from fixed-abrasive grinding processes. In many cases, the optical fabricator can now take a SCHOTT generated ZERODUR® substrate directly into small-tool deterministic optical finishing. This is especially important for lightweight mirrors where in the past large optical tools would be used to generate the aspheric and to remove subsurface damage. In the process of large optical tool work, the optical fabricator would induce mid-spatial frequency quilting, which subsequently would need to be removed by small tools. Substantial time-savings for the optical fabricator are now available with ZERODUR®.

Paper Details

Date Published: 25 February 2020
PDF: 10 pages
Proc. SPIE 11116, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems II, 1111615 (25 February 2020); doi: 10.1117/12.2529793
Show Author Affiliations
Tony Hull, The Univ. of New Mexico (United States)
Thomas Westerhoff, SCHOTT AG (Germany)
Ralf Jedamzik, SCHOTT AG (Germany)

Published in SPIE Proceedings Vol. 11116:
Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems II
Tony B. Hull; Dae Wook Kim; Pascal Hallibert, Editor(s)

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