The optimal cell gap determination of a liquid crystal wavefront corrector from a single photoelectric measurement |
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| Authors: | Qidong Wang Zenghui Peng Lishuang Yao Yonggang Liu Lifa Hu Zhaoliang Cao |
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| Institution: | 1. State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, China;2. University of Chinese Academy of Sciences, Beijing, China |
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| Abstract: | It has been a crucial technique to improve the dynamic response characteristics of a liquid crystal wavefront corrector (LCWFC) with optimal cell gap since the LCWFC needs at least 2π (or π) phase modulation in adaptive optics systems (AOSs). We have given a complete process for obtaining the optimal cell gap accurately from a single photoelectric measurement, which can be conducted with a liquid crystal (LC) cell of any known thickness. This method has been analysed theoretically and confirmed experimentally by using a wedge-shaped cell; the experimental results match very well with the theoretical analysis. The response time of an optimal gap cell can be a novel evaluation method of response performance of LC materials. |
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| Keywords: | liquid crystal response time optimal cell gap wedge-shaped cell photoelectric measurement |
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