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Study on the fabrication of a high precision aluminum alloy cylindrical mirror with combined process
Author(s): Xinlei Li; Xiaoqiang Peng; Hao Hu; Can Yang; Jinqiu Deng
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Paper Abstract

With the excellent optical performance especially some aspherical surfaces enhanced, aluminum alloy mirrors are widely used in many optical systems. The technique of Single-point diamond turning (SPDT) applied in the IR optical application directly. However, it is difficult to obtain higher precision for some complex mirrors and the remaining periodic diamond turning structure can cause scatter losses for shorter wavelengths. Hence, additional polishing steps are necessary. In this paper, a process chain contains SPDT and Magnetorheological finishing (MRF), is put forward for machining an aluminum alloy cylindrical mirror. A high accurate measurement setup, composed of an interferometer and an advanced Computer generated hologram (CGH) is built, and the data distortion is analyzed and corrected. Additionally, normal positioning error caused by tool setting is analyzed and simulated, and a workpiece self-localization system in MRF is used to control the error. The experimental result shows that the surface texture converges to PV 0.233λ (λ=632.8nm, 90% aperture), rms 0.040λ (90% aperture). It is concluded that the form accuracy of the aluminum alloy cylindrical mirror is improved by the process chain, moreover, the process chain is the reference for the fabrication of aluminum alloy mirrors with complex surfaces.

Paper Details

Date Published: 11 January 2019
PDF: 6 pages
Proc. SPIE 10837, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 1083712 (11 January 2019); doi: 10.1117/12.2505823
Show Author Affiliations
Xinlei Li, National Univ. of Defense Technology (China)
Xiaoqiang Peng, National Univ. of Defense Technology (China)
Hao Hu, National Univ. of Defense Technology (China)
Can Yang, National Univ. of Defense Technology (China)
Jinqiu Deng, National Univ. of Defense Technology (China)


Published in SPIE Proceedings Vol. 10837:
9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes
Xiaoliang Ma; Bin Fan; Yongjian Wan; Adrian Russell; Xiangang Luo, Editor(s)

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