采用全息干涉法的纯扩散机制光折变相移研究

Experimental Study of Photorefractive Phase Shift Under Diffusion Only by Using Holographic Interferometry

基于光折变两波耦合(TWC)理论,导出纯扩散机制情况下衍射再现光波和直透光波间的相位差与光折变相移的关系;把光折变晶体(PRC)作为全息干涉记录介质,基于光折变TWC机制和全息干涉技术,提出了一种可直观验证光折变相移的方法;以纯扩散情况下Ce:SBN晶体TWC为例,给出了光折变相移的直观观测实验结果。

The phase difference between the diffracted signal wave and the directed signal wave under the case of diffusion only was derived, based on photorefractive two-wave coupling theory, and the relation between this phase difference and the photorefractive phase shift was obtained. A new method for experimentally demonstrating and observing the photorefractive phase shift was proposed, where the photorefractive crystal is used as the recording medium of holographic interferometry. Experimental results were given for Ce:SBN crystal with no externally applied electric field.