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5 October 2023 Fabrication of freeform mirrors for the KASI-Deep Rolling Imaging Fast Telescope
Dohoon Kim, Changhee Lee, JaeYeong Jo, Hong Ki Kim, Taejong Kim, Minho Seo, Byoung-hyun Park, Hyun-il Cho, Yunjong Kim, Jongwan Ko, Young-Soo Kim
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Proceedings Volume PC12677, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems IV; PC126770C (2023) https://doi.org/10.1117/12.2677323
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States
Abstract
We fabricated three freeform mirrors for the KASI-Deep Rolling Imaging Fast Telescope pathfinder, which is a confocal off-axis freeform three-mirror system with a 300 mm entrance pupil diameter. During the fabrication process, we light-weighted the primary mirror, reducing its weight by 52%. Front surfaces of these off-axis freeform mirrors were formed by a series of production process, including grinding, polishing, forming, and finishing. Measuring surface profile has been performed by using Coordinate Measuring Machines (CMMs) for the grinding process and an interferometer with Computer Generated Holograms (CGHs) for polishing, forming, and finishing process. The test results for all three mirrors were well within the required value of 20 nm RMS.
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Dohoon Kim, Changhee Lee, JaeYeong Jo, Hong Ki Kim, Taejong Kim, Minho Seo, Byoung-hyun Park, Hyun-il Cho, Yunjong Kim, Jongwan Ko, and Young-Soo Kim "Fabrication of freeform mirrors for the KASI-Deep Rolling Imaging Fast Telescope", Proc. SPIE PC12677, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems IV, PC126770C (5 October 2023); https://doi.org/10.1117/12.2677323
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KEYWORDS
Mirrors
Mirror surfaces
Telescopes
Fabrication
Surface finishing
Computer generated holography
Off axis mirrors
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