取向Kerr效应对液晶光控取向质量的影响

INFLUENCE OF ORIENTATIONAL KERR EFFECT ONPHOTOINDUCED ALIGNMENT OF LIQUID CRYSTALS

取向Ｋｅｒｒ效应对液晶光控取向质量的影响＊王淑梅ａ）梁兆颜闫石谢景力ｂ）田颜清ｂ）黄锡民ａ）（中国科学院激发态物理开放研究实验室，长春１３００２１）（中国科学院长春物理研究所，长春１３００２１）ｂ）（吉林大学化学系，长春１３００２３）关键词取向Ｋｅｒ...

?The influence of orientational Kerr effect on photoinduced alignmetnt of liquid crystals was studied at different intensities of linearly polarized 355nm laser pulse and viscosities of the photoprepolymer layers. The coumarin photoprepolymer materials(LPP2) which was used to make linear photopolymerization(LPP) layers has large thirdorder nonlinearity at 355nm laser pulses with 250ps(FWHM) duration. Its nonlinear refractive index was n2=-237×10-9 esu. The major origin of its thirdorder nonlinearity is orientational Kerr effect. The polarized microscopic photographs of liquid crystals cells obtained at different irradiation intensities and viscosities certainly exhibit that orientational Kerr effect increases the probability of linear photopolymerization in the linear polarized direction and improves the quality of photoinduced alignment of liquid crystals.