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• W2890948690 abstract "Off-axis parabolic parts (OAPs) or quasi-OAPs are mostly frequently used in large optical telescopes. Compared to the stressed mirror polishing, computer-controlled optical surfacing (CCOS) or other computer-controlled subaperture tools provide more flexibility. However, the fabrication efficiency needs to be promoted in tactical ways. In this paper, we present a large aperture CCOS lap equipped with a compound motion unit and go through the grinding and pre-polishing with its figure errors. A CCOS-based heterocercal tool is first used in large optics to restrain the edge effects. In the fine polishing stage, corrective polishing, smoothing, and ion beam figuring are applied in combination to finish. We experimentally test this strategy on an &#x00D8;1.5&#x2009;&#x2009;m OAP, as a part of giant steerable science mirror (GSSM) in the Thirty Meter Telescope. Finally, the surface error of &#x00D8;1.5&#x2009;&#x2009;m OAP is better than 1/50&#x03BB; RMS (full aperture), and the mid-spatial frequency part is better than 0.64&#x00A0;&#x03BC;rad in slope RMS (effective aperture). The effective fabrication duration is reduced to 2 months." @default.
• W2890948690 created "2018-09-27" @default.
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• W2890948690 date "2018-09-24" @default.
• W2890948690 modified "2023-09-26" @default.
• W2890948690 title "Rapid fabrication strategy for Ø15 m off-axis parabolic parts using computer-controlled optical surfacing" @default.
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• W2890948690 doi "https://doi.org/10.1364/ao.57.000f37" @default.
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