LiNbO_3∶Fe晶体光栅擦除特性  

Characteristics of Grating Erasure in LiNbO_3∶Fe

作　　者：朱荣[1] 刘德安[1] 刘立人[1] 柴志方[1] 郭袁俊[1] 

机构地区：[1]中国科学院上海光学精密机械研究所信息光学实验室,上海201800

出　　处：《中国激光》2006年第2期185-189,共5页Chinese Journal of Lasers

基　　金：国家973计划(2002CCA03500);国家自然科学基金(60177016)资助项目

摘　　要：在光折变过程中,光波对掺杂中心的激发系数S是一个重要的物理量。为了求出光激发系数S对波长λ的依赖,研究了在不同的擦除波长条件下,记录在光折变晶体LiNbO3∶Fe中的光栅衰减特性。实验结果表明lnP(P为光擦除灵敏度)与擦除波长λ呈线性关系,即波长越短,光栅擦除越快,光擦除灵敏度越高。在单中心电子带传输模型的基础上,理论计算也证实了实验结果。利用带传输模型,给出了理论上光激发系数S对波长的指数依赖关系。同时微观量μτ(为量子效率)也可由光栅擦除实验求出。The photon-excitation coefficient S is important in the process of photorefraction. In order to identify the dependence of the photon-excitation coefficient S on the wavelength λ, the photorefractive characteristics of grating erasure in LiNbO3 ： Fe crystal with different erasing wavelengths are investigated. The dependence of the logarithm of erasing sensitivity P on wavelength 2 is linear, i.e. the shorter wavelength, the faster grating erasure, the higher erasing sensitivity. The theoretical calculations based on electron transport model confirmed this point. And the theoretically exponential dependence of electron photo-excitation coefficient S of the Fe center on the wavelength in the visible is obtained. Also the microscopic quantity φμγ can be obtained by grating erasure in visible.

关 键 词：非线性光学 衍射与光栅 光折变 擦除灵敏度 光激发系数 

分 类 号：O437[机械工程—光学工程]