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25 February 2020 Optimizing ZERODUR mirror substrate fabrication processes for efficient optical fabrication
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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®.
© (2020) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Tony Hull, Thomas Westerhoff, and Ralf Jedamzik "Optimizing ZERODUR mirror substrate fabrication processes for efficient optical fabrication", Proc. SPIE 11116, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems II, 1111615 (25 February 2020); https://doi.org/10.1117/12.2529793
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