基于液晶空间光调制器的偏振选择特性研究
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摘要
提出一种利用液晶空间光调制器实现二维光场偏振态编码与偏振态选择的方法,其基本思想是通过控制液晶空间光调制器上加载的灰度值改变出射光波的偏振态.对液晶空间光调制器改变光波偏振态的能力进行了研究,利用在空间光调制器不同区域上加载不同灰度对入射光波进行偏振态编码,在输出端实现了以偏振态作为条件进行选择输出.实验结果表明,该方法通过灰度编码能够产生包含两个偏振方向正交的出射光场,并且所组成的偏振选择衍射系统能够实现对衍射光场的偏振态选择.
A method to achieve 2-D polarization-encoding in the light field and polarization-selection based on liquid-crystal spatial light modulator(LCSLM)is proposed.The basic idea is to change the polarization state of output light wave with the gray-level working on LCSLM.The capability of changing the polarization distribution of a light field based on LCSLM is studied in this paper.We encode the polarization state of incident beam with different gray levels working on LCSLM ' s different areas,so different output informations with different polarization states could be obtained.The experimental results show that the method can generate a light filed obtained two orthogonal polarization directions based on gray-level encoding,and the polarization-selective diffraction system can realize polarization-selection of the diffractive field.
A method to achieve 2-D polarization-encoding in the light field and polarization-selection based on liquid-crystal spatial light modulator(LCSLM)is proposed.The basic idea is to change the polarization state of output light wave with the gray-level working on LCSLM.The capability of changing the polarization distribution of a light field based on LCSLM is studied in this paper.We encode the polarization state of incident beam with different gray levels working on LCSLM ' s different areas,so different output informations with different polarization states could be obtained.The experimental results show that the method can generate a light filed obtained two orthogonal polarization directions based on gray-level encoding,and the polarization-selective diffraction system can realize polarization-selection of the diffractive field.
引文
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[15]Guo Chengshan,Yue Shujuan,Wang Xilin,et al.Polarization-selective diffractive optical elements with a twisted-nematic liq-uid-crystal display[J].Applied Optics,2010,49(7):1 069-1 074.
[2]Solomon J E.Polarization imaging[J].Applied Optics,1981,20(9):1 537-1 544.
[3]Davis J A,Evans G H,Moreno I.Polarization-multiplexed diffractive optical elements with liquid-crystal displays[J].AppliedOptics,2005,44(19):4 049-4 052.
[4]Sanyal S,Bandyopadhyay P,Ghosh A.Vector wave imagery using a birefringent lens[J].Optical Engineering,1998,37:592-599.
[5]田勇,潘旭,王长顺,等.偶氮液晶聚合物薄膜的二维偏振全息记录[J].物理学报,2009,58(10):6 979-6 984.Tian Yong,Pan Xu,Wang Changshun,et al.Two-dimensional polarization holographic recordings in azobenzene liquid-crystal-line polymer thin films[J].Acta Physica Sinica,2009,58(10):6 979-6 984.(in Chinese)
[6]Mogensen P C,Gluckstad J.A phase-based optical encryption system with polarisation encoding[J].Optics Communication,2000,173:177-183.
[7]Alfalou A,Brosseau C.Dual encryption scheme of images using polarized light[J].Optics Letters,2010,35(13):2 185-2 187.
[8]厉以宇,王媛媛,陈浩,等.基于二维结构薄膜的偏振选择相位光栅的研究[J].物理学报,2010,59(7):5 110-5 115.Li Yiyu,Wang Yuanyuan,Chen Hao,et al.Polarization dependent phase grating based on two-dimensional structured thinfilms[J].Acta Physica Sinica,2010,59(7):5 110-5 115.(in Chinese)
[9]Vasnetsov M V,Pas’ko V A,Kasyanyuk D S.Observation of polarization conflict caused by geometrical phase in a twisted ne-matic liquid crystal cell[J].Optics Letters,2011,36(11):2 134-2 136.
[10]Ignacio Moreno,Jeffrey A Davis,Travis M Hernandez,et al.Complete polarization control of light from a liquid crystal spatiallight modulator[J].Optics Express,2012,20(1):364-376.
[11]李宇波,周强,吴树高,等.液晶型圆偏振调制器[J].光电子激光,2011,22(10):1 483-1 487.Li Yubo,Zhou Qiang,Wu Shugao,et al.An optical circular-polarization modulator based liquid crystal[J].Journal of Optoe-lectronics.Laser,2011,22(10):1 483-1 487.(in Chinese)
[12]蒋骥,朱宏宇,程柯夫,等.扭曲向列液晶偏振性质的研究[J].实验室研究与探索,2011,30(7):47-49.Jiang Ji,Zhu Hongyu,Cheng Kefu,et al.Researches on the polarization properties of twisted nematic liquid crystal[J].Re-search and Exploration in Laboratory,2011,30(7):47-49.(in Chinese)
[13]Yeh P,Gu C.Optics of Liquid Crystal Displays[M].New York:Wiley,1999.
[14]刘永军,宣丽,胡立发,等.高精度纯相位液晶空间光调制器的研究[J].光学学报,2005,25(12):1 682-1 686.Liu Yongjun,Xuan Li,Hu Lifa,et al.Investigation on the liquid crystal spatial light modulator with high precision and purephase[J].Acta Optica Sinica,2005,25(12):1 682-1 686.(in Chinese)
[15]Guo Chengshan,Yue Shujuan,Wang Xilin,et al.Polarization-selective diffractive optical elements with a twisted-nematic liq-uid-crystal display[J].Applied Optics,2010,49(7):1 069-1 074.