Diffractive characteristics of the liquid crystal spatial light modulator
Cao Zhao-Liang(曹召良)a)b)†, Mu Quan-Quan(穆全全)a)b), Hu Li-Fa(胡立发)a), Liu Yong-Gang(刘永刚)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 100039, China
Abstract The liquid crystal spatial light modulator (LC SLM) is very suitable for wavefront correction and optical testing and can produce a wavefront with large phase change and high accuracy. The LC SLM is composed of thousands of pixels and the pixel size and shape have effects on the diffractive characteristics of the LC SLM. This paper investigates the pixel effect on the phase of the wavefront with the scalar diffractive theory. The results show that the maximum optical path difference modulation is 41 $\mu$m to produce the paraboloid wavefront with the peak to valley accuracy better than $\lambda$/10. Effects of the mismatch between the pixel and the period, and black matrix on the diffraction efficiency of the LC SLM are also analysed with the Fresnel phase lens model. The ability of the LC SLM is discussed for optical testing and wavefront correction based on the calculated results. It shows that the LC SLM can be used as a wavefront corrector and a compensator.
Received: 09 October 2006
Revised: 07 November 2006
Accepted manuscript online:
Fund: Project supported by the
National Natural Science Foundation of China (Nos 60578035,
50473040) and the Science Foundation of Jilin Province (Nos
20050520, 20050321-2).
Cite this article:
Cao Zhao-Liang(曹召良), Mu Quan-Quan(穆全全), Hu Li-Fa(胡立发), Liu Yong-Gang(刘永刚), and Xuan Li(宣丽) Diffractive characteristics of the liquid crystal spatial light modulator 2007 Chinese Physics 16 1665
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