Fast generation of controllable equal-intensity four beams based on isosceles triangle multilevel phase grating realized by liquid crystal spatial light modulator

doi:10.1088/1674-1056/20/2/024211

中国物理B ›› 2011, Vol. 20 ›› Issue (2): 24211-024211.doi: 10.1088/1674-1056/20/2/024211

Fast generation of controllable equal-intensity four beams based on isosceles triangle multilevel phase grating realized by liquid crystal spatial light modulator

刘翔, 张健, 吴丽莹, 甘雨

Institute of Ultra-Precision Optoelectronic Instrument Engineering, Harbin Institute of Technology, P.O. Box 3017, No. 2 Yikuang Street, Nangang District, Harbin 150080, China

收稿日期:2010-08-09 修回日期:2010-08-18 出版日期:2011-02-15 发布日期:2011-02-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 60878048) and the China Postdoctoral Science Foundation (Grant No. 20080440898).

Fast generation of controllable equal-intensity four beams based on isosceles triangle multilevel phase grating realized by liquid crystal spatial light modulator

Liu Xiang(刘翔)^†, Zhang Jian(张健), Wu Li-Ying(吴丽莹), and Gan Yu(甘雨)

Institute of Ultra-Precision Optoelectronic Instrument Engineering, Harbin Institute of Technology, P.O. Box 3017, No. 2 Yikuang Street, Nangang District, Harbin 150080, China

Received:2010-08-09 Revised:2010-08-18 Online:2011-02-15 Published:2011-02-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 60878048) and the China Postdoctoral Science Foundation (Grant No. 20080440898).

摘要/Abstract

摘要： Liquid crystal spatial light modulator (LCSLM) realizing equal-intensity multiple beams often has some features, i.e., phase valley between two adjacent pixels, flyback region when phase decreases immediately from 2π to 0, and inevitable backplane curvature, which are different from those of most conventional diffractive optical elements (DOEs), such as static DOEs. For optimal intensity uniformity, equal-intensity multi-beam generation must be considered for these artifacts. We present a tunable-grating method in which the intensity uniformity can be improved by considering the LCSLM artifacts. For instance, tuning phase modulation depth of the grating, called isosceles triangle multilevel phase grating (ITMPG), can be used not only to improve the intensity uniformity, but also to fast steer four beams with narrow beamwidths, determined by the same effective aperture of ITMPG. Improved intensity uniformity and high relative diffraction efficiency are demonstrated through experiments with phase-only LCSLM.

关键词: liquid crystal spatial light modulator, phase grating, splitter

Abstract: Liquid crystal spatial light modulator (LCSLM) realizing equal-intensity multiple beams often has some features, i.e., phase valley between two adjacent pixels, flyback region when phase decreases immediately from 2$\pi$ to 0, and inevitable backplane curvature, which are different from those of most conventional diffractive optical elements (DOEs), such as static DOEs. For optimal intensity uniformity, equal-intensity multi-beam generation must be considered for these artifacts. We present a tunable-grating method in which the intensity uniformity can be improved by considering the LCSLM artifacts. For instance, tuning phase modulation depth of the grating, called isosceles triangle multilevel phase grating (ITMPG), can be used not only to improve the intensity uniformity, but also to fast steer four beams with narrow beamwidths, determined by the same effective aperture of ITMPG. Improved intensity uniformity and high relative diffraction efficiency are demonstrated through experiments with phase-only LCSLM.

Key words: liquid crystal spatial light modulator, phase grating, splitter

中图分类号: (Liquid crystals)

42.70.Df

42.79.Hp (Optical processors, correlators, and modulators) 42.79.Dj (Gratings)

刘翔, 张健, 吴丽莹, 甘雨. Fast generation of controllable equal-intensity four beams based on isosceles triangle multilevel phase grating realized by liquid crystal spatial light modulator[J]. 中国物理B, 2011, 20(2): 24211-024211.

Liu Xiang(刘翔), Zhang Jian(张健), Wu Li-Ying(吴丽莹), and Gan Yu(甘雨) vgluept . Fast generation of controllable equal-intensity four beams based on isosceles triangle multilevel phase grating realized by liquid crystal spatial light modulator[J]. Chin. Phys. B, 2011, 20(2): 24211-024211.

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Fast generation of controllable equal-intensity four beams based on isosceles triangle multilevel phase grating realized by liquid crystal spatial light modulator

Fast generation of controllable equal-intensity four beams based on isosceles triangle multilevel phase grating realized by liquid crystal spatial light modulator

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