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	Optical nonlinearity and holographic storage in azo side-chain liquid crystal polymer
	Bao, XX ; Tian, YQ ; Tong, WG
	2000
关键词	azo side-chain polymer holographic storage anisotropy POLARIZATION HOLOGRAPHY PHOTOANISOTROPIC MATERIALS BIREFRINGENCE
英文摘要	In this paper, the optical nonlinearity and multiplex holographic storage using azo side-chain polymer are studied by degenerate four-wave mixing and polarized light pump-probe method with a He-Ne laser. The He-Ne laser wavelength is located in the tail of absorption peak of sample. This material shows high diffraction efficiency of grating and information storage capability in the case of weak absorption. The diffraction efficiency of grating is up to the order of 10(-2). The effect of polarization beams on grating is studied. The diffraction efficiency of grating is least in the case that the polarization of readout beam is orthogonal to that of both writing beams. A angle multiplex holographic storage in the sample is performed and information can be stored for long-term in room temperature. The information readout of multiplex holographic storage in the samples can be controlled by the polarization of readout beam. The diffraction deficiency of grating versus temperature of sample is studied. It is demonstrated that the higher temperature under the melt-temperature the sample has, the larger diffraction efficiency and faster relaxation grating has. The grating is completely erased by increasing temperature over the melting-temperature of the sample. Reading the grating with a circular polarized light isn't able to erased the grating. When two recording beams are turned off, great part of the grating remains for a long-term beside few part of the grating degrades. The results show that the azo side-chain polymer is a good information storage material. The anisotropic optical nonlinear refraction index of the samples are measured. The nonlinear refraction index of the samples versus the different ratio of azo functional group in the polymers and the temperature of the sample are studied. The largest nonlinear refraction index is up to the order of 10(-2). The optical nonlinearity of the samples mono-increased with increasing of the temperature of the samples. No anisotropic nonlinearity appears when the temperature of the sample is over the melt-temperature of the samples. The anisotropic nonlinearity of three samples with different ate-side group ratio in the polymer is compared.; Optics; CPCI-S(ISTP); 0
语种	英语
DOI标识	10.1117/12.386363
内容类型	其他
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/313888]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Bao, XX,Tian, YQ,Tong, WG. Optical nonlinearity and holographic storage in azo side-chain liquid crystal polymer. 2000-01-01.

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