组合外加电场提高Fe∶LiNbO_3中90°记录体全息的衍射效率  

Enhancement of Diffraction Efficiency for 90° Recording Geometry Hologram by the Application of Combined External Electric Fields in Fe-Doped LiNbO_3 Crystals

作　　者：闫爱民[1] 刘德安[1] 柴志方[1] 周煜[1] 栾竹[1] 刘立人[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》2005年第12期1659-1663,共5页Chinese Journal of Lasers

基　　金：国家自然科学基金(60177106);国家科学技术部(2002CCA03500)资助项目

摘　　要：针对90°全息记录结构的特殊性,在记录和读出阶段分别施加不同极性的外加电场,实现了Fe∶LiNbO3晶体中高衍射效率的全息记录和读出。在库赫塔列夫(Kukhtarev)方程基础上引入两维耦合波理论,对组合外加电场提高掺铁铌酸锂晶体光折变特性的机理进行了探讨。实验和理论计算结果都表明这种分别在记录和读出过程施加不同极性组合的外加电场是在Fe∶LiNbO3中实现高衍射效率90°记录结构体全息的有效技术方案。Significant improvements of photorefractive properties such as diffraction efficiency with 90° holographic recording geometry have been obtained by the application of external electric fields with different directions during recording and readout phase. Based on the vectorial Kukhtarev equations and two-dimensional coupled wave theory, the theoretical analysis are given to investigate the photorefractive properties of Fe-doped LiNbO3 crystals when the external electric field is applied. Experimental and theoretical results show that the application of combined external electric field is an effective and useful optimal scheme for the enhancement of diffraction efficiency with 90° recording geometry.

关 键 词：全息 FE:LINBO3晶体 90°全息记录结构 外加电场 光折变效应 

分 类 号：O734.1[理学—晶体学] TP333.41[自动化与计算机技术—计算机系统结构]