偶氮苯液晶薄膜相位共轭的光学记录研究

利用间并四波混频研究了一种偶氮苯液昌聚合物的相位共轭和光学记录特性，在近共振条件下，用低功率Ｎｄ：ＹＡＧ倍频激光得到高效率的相位共轭光和高阶衍射光，当光强达到１０Ｗ／ｃｍ＾２量级时，薄膜显示出光记录效应，即在撒掉写入光之后，相位共轭波并不消失，进一步大光强到１０＾３Ｗ／ｃｍ＾２量级时，出现三组分别只与前向泵浦光，后向泵浦光和信号有关的高阶衍射光。其中观察到第三阶衍射光，且在撒掉任两束光后，所剩一束

Properties of Phase Conjugation and Optical Storage in Liquid-Crystal Polymer Film

Phase conjugation (PC) and optical storage in a liquid-crystul polymer film were studied by degenerated four-wave mixing. On the basis of resonant absorption,high-efficiency phase conjugated beam was obtained while low-intensity incident waves were used. When intensities of the waves increased to the order of 10 W/cm2, the film showed a behavior of optical storage and high- order diffraction was observed. As intensities of the incident waves reached the order of los W/cm2, three groups of backward and forward high-order diffraction beams were detected. The highest-order diffraction beam was the 3rd-order one. After turning of f two of the incident waves, the high-order diffraction produced by the remained wave didnI t decrease obviously. After the bleaching, a brilliant hologram spot was observed on the film and could be maintained over 120 days under general storage conditions.