| CLASSICAL AREAS OF PHENOMENOLOGY |
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High precision Zernike modal gray map reconstruction for liquid crystal corrector |
| Liu Chao(刘超)a)b)†, Mu Quan-Quan(穆全全) a)b), Hu Li-Fa(胡立发)a), Cao Zhao-Liang(曹召良)a), and Xuan Li(宣丽) a) |
| a State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China; b Graduate School of the Chinese Academy of Sciences, Beijing 100049, China |
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Abstract This paper proposes a new Zernike modal gray map reconstruction algorithm used in the nematic liquid crystal adaptive optics system. Firstly, the new modal algorithm is described. Secondly, a single loop correction experiment was conducted, and it showed that the modal method has a higher precision in gray map reconstruction than the widely used slope method. Finally, the contrast close-loop correction experiment was conducted to correct static aberration in the laboratory. The experimental results showed that the average peak to valley (PV) and root mean square (RMS) of the wavefront corrected by mode method were reduced from 2.501$\lambda$ ($\lambda =633~nm$) and 0.610$\lambda$ to 0.0334$\lambda$ and 0.00845$\lambda$, respectively. The corrected PV and RMS were much smaller than those of 0.173$\lambda$ and 0.048$\lambda$ by slope method. The Strehl ratio and modulation transfer function of the system corrected by mode method were much closer to diffraction limit than with slope method. These results indicate that the mode method can take good advantage of the large number of pixels of the liquid crystal corrector to realize high correction precision.
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Received: 21 October 2009
Accepted manuscript online:
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PACS:
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42.79.Kr
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(Display devices, liquid-crystal devices)
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42.30.Wb
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(Image reconstruction; tomography)
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42.30.Lr
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(Modulation and optical transfer functions)
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42.15.Fr
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(Aberrations)
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| Fund: Project supported by the National
Natural Science Foundation of China (Grants Nos.~60736042, 60578035
and 50703039) and Science and Technology Cooperation Project between
Chinese Academy of Sciences and Jilin Province (Grant
No.~2008SYHZ0005). |
Cite this article:
Liu Chao(刘超), Mu Quan-Quan(穆全全), Hu Li-Fa(胡立发), Cao Zhao-Liang(曹召良), and Xuan Li(宣丽) High precision Zernike modal gray map reconstruction for liquid crystal corrector 2010 Chin. Phys. B 19 064214
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