中国物理B ›› 2007, Vol. 16 ›› Issue (6): 1665-1671.doi: 10.1088/1009-1963/16/6/030

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Diffractive characteristics of the liquid crystal spatial light modulator

胡立发1, 刘永刚1, 宣丽1, 曹召良2, 穆全全2   

  1. (1)State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China; (2)State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China;Graduate School of the Chinese Academy of Sciences, Beijing 100039, China
  • 收稿日期:2006-10-09 修回日期:2006-11-07 出版日期:2007-06-20 发布日期:2007-06-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Nos 60578035, 50473040) and the Science Foundation of Jilin Province (Nos 20050520, 20050321-2).

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)   

  1. 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
  • Received:2006-10-09 Revised:2006-11-07 Online:2007-06-20 Published:2007-06-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Nos 60578035, 50473040) and the Science Foundation of Jilin Province (Nos 20050520, 20050321-2).

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摘要： 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 $\la$/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.

关键词: liquid crystal spatial light modulator, diffraction efficiency, pixel, wavefront

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.

Key words: liquid crystal spatial light modulator, diffraction efficiency, pixel, wavefront

中图分类号:  (Liquid crystals)

  • 42.70.Df
42.25.Fx (Diffraction and scattering) 42.79.Hp (Optical processors, correlators, and modulators)