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Chin. Phys. B, 2017, Vol. 26(6): 060706    DOI: 10.1088/1674-1056/26/6/060706
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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
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.
Keywords:  telescope      active or adaptive optics      astronomical      image analysis  
Received:  26 September 2016      Revised:  10 January 2017      Accepted manuscript online: 
PACS:  07.60.-j (Optical instruments and equipment)  
  07.60.Ly (Interferometers)  
  42.68.Wt (Remote sensing; LIDAR and adaptive systems)  
  95.55.Cs (Ground-based ultraviolet, optical and infrared telescopes)  
Fund: Project supported by the National High Technology Research and Development Program of China.
Corresponding Authors:  Hao Xian     E-mail:  xianhao@ioe.ac.cn

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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