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Proceedings Paper

Variable curvature mirror having variable thickness: design and fabrication
Author(s): Hui Zhao; Xiaopeng Xie; Liang Xu; Jiaoteng Ding; Le Shen; Jie Gong
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Paper Abstract

Variable curvature mirror (VCM) can change its curvature radius dynamically and is usually used to correct the defocus and spherical aberration caused by thermal lens effect to improve the output beam quality of high power solid-state laser. Recently, the probable application of VCM in realizing non-moving element optical zoom imaging in visible band has been paid much attention. The basic requirement for VCM lies in that it should provide a large enough saggitus variation and still maintains a high enough surface figure at the same time. Therefore in this manuscript, by combing the pressurization based actuation with a variable thickness mirror design, the purpose of obtaining large saggitus variation and maintaining quite good surface figure accuracy at the same time could be achieved. A prototype zoom mirror with diameter of 120mm and central thickness of 8mm is designed, fabricated and tested. Experimental results demonstrate that the zoom mirror having an initial surface figure accuracy superior to 1/80λ could provide bigger than 36um saggitus variation and after finishing the curvature variation its surface figure accuracy could still be superior to 1/40λ with the spherical aberration removed, which proves that the effectiveness of the theoretical design.

Paper Details

Date Published: 24 October 2017
PDF: 8 pages
Proc. SPIE 10463, AOPC 2017: Space Optics and Earth Imaging and Space Navigation, 104631D (24 October 2017); doi: 10.1117/12.2285184
Show Author Affiliations
Hui Zhao, Xi'an Institute of Optics and Precision Mechanics (China)
Xiaopeng Xie, Univ. of Chinese Academy of Science (China)
Liang Xu, Xi'an Institute of Optics and Precision Mechanics (China)
Jiaoteng Ding, Xi'an Institute of Optics and Precision Mechanics (China)
Le Shen, Xi'an Institute of Optics and Precision Mechanics (China)
Jie Gong, Xi’an BoYa Precision Optics Co. Ltd. (China)

Published in SPIE Proceedings Vol. 10463:
AOPC 2017: Space Optics and Earth Imaging and Space Navigation
Carl Nardell; Suijian Xue; Huaidong Yang, Editor(s)

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