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Co-focus experiment of segmented mirror |
| Bin Li(李斌)1,2,3, Wen-Hao Yu(于文豪)1,2,3, Mo Chen(陈莫)1,2,3, Jin-Long Tang(唐金龙)1,3, Hao Xian(鲜浩)1,3 |
1 Key Laboratory on Adaptive Optics, Chinese Academy of Sciences, Chengdu 610209, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China;
3 The Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China |
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Abstract In this paper, an active optics and co-focus experimental system of segmented mirror is built. Firstly, a support structure of segmented mirror is designed and it is verified by simulation to meet the requirement for the experimental system of segmented mirror. In this system, the large de-focus and tilt/tip errors of the segmented mirror are adjusted by observing the density and contrast of interference fringes based on isoclinic interference theory until the defocus and tilt/tip errors are in the detective range of the Shack-Hartmann. Then, the Shack-Hartmann is used to measure them and they are adjusted by actuators. The actuators are controlled by active optics to realize the closed-loop adjustment and maintenance for fine co-focus of segmented mirror. And the interference fringes are utilized to verify the detective precision of Shack-Hartmann. After the co-focus fine-tuning of the segmented mirror, the tilt/tip residual surface error is better than 0.01λ RMS; the defocus residual surface error is better than 0.01λ RMS.
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Received: 26 September 2016
Revised: 10 January 2017
Accepted manuscript online:
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PACS:
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07.60.-j
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(Optical instruments and equipment)
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07.60.Ly
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(Interferometers)
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42.68.Wt
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(Remote sensing; LIDAR and adaptive systems)
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95.55.Cs
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(Ground-based ultraviolet, optical and infrared telescopes)
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| Fund: Project supported by the National High Technology Research and Development Program of China. |
Corresponding Authors:
Hao Xian
E-mail: xianhao@ioe.ac.cn
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Cite this article:
Bin Li(李斌), Wen-Hao Yu(于文豪), Mo Chen(陈莫), Jin-Long Tang(唐金龙), Hao Xian(鲜浩) Co-focus experiment of segmented mirror 2017 Chin. Phys. B 26 060706
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