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Effect of the twisted alignment on the liquid crystal wave-front corrector |
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| Authors: | Zhaoliang Cao Quanquan Mu Guillaume Dovillaire Thomas Grandin Emeric Lavergne Lifa Hu Li Xuan |
| Institution: | a State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, P. R. China b Graduate School of Chinese Academy of Sciences, Beijing 100049, P. R. China c Imagine Optic, 18 rue Charles de Gaulle, 91400 Orsay, France |
| Abstract: | The effect of twisted alignment on the phase modulation of a liquid crystal wave-front corrector was investigated. First, the effect of twisted alignment is discussed in terms of the modulation principle of the liquid crystal molecule. Only partial incident light can be modulated because of the effect of the twisted alignment. Other unmodulated light will affect the correction accuracy and the resolution of the image. The blazed grating method is proposed to solve this problem. Adaptive correction was performed without the blazed grating method and the correction results are poor. A similar adaptive correction experiment was performed with the blazed grating method and a better correction result is obtained. The residual averaged wave-front errors are PV = 0.101λ and RMS = 0.015λ and a resolvable image is obtained. |
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