光折变晶体中由 2 k反射光栅形成自泵浦相位共轭(英文)  

SELF-PUMPED PHASE CONJUGATION VIA 2k REFLECTION GRATING IN PHOTOREFRACTIVE CRYSTALS

作　　者：郭儒[1] 

机构地区：[1]南开大学物理学院,天津300071

出　　处：《南开大学学报（自然科学版）》2000年第4期1-5,共5页Acta Scientiarum Naturalium Universitatis Nankaiensis

摘　　要：本文给出在光折变晶体中通过受激二波混频形成自泵浦相位共轭的一种理论 .在适当条件下 ,二波混频的耦合波方程可化为相位共轭光学中的一对耦合模方程 ,对于折射率光栅与条纹之间具有任意相移的光折变 2 k光栅 ,其反射的背向散射波的解是入射泵浦光的相位共轭波 .产生自泵浦相位共轭的条件是背向波能最有效地吸取入射光束的功率 ,以至于背向散射光的强度处处等于入射光的光强 ;The paper gives another theoretical description for self pumped phase conjugation formed by stimulated two wave mixing in photorefractive crystals. The coupled wave equations for two wave mixing can be reduced to a pair of coupled mode equations in phase conjugation optics under the appropriate conditions, its solution for backscattering wave of the photorefractive 2k reflection grating with arbitrary spatial phase shift between index grating and fringe pattern is the phase conjugation of the incident pump wave. These conditions for generating self pumped phase conjugation are that the backscattering beam suck up so effectively the power of the incident beam that the backscattering intensity equals to incident pump intensity everywhere, and that the backscattering seed wave intensity should exceed certain threshold. $$$$

关 键 词：自泵浦相位共轭 光折变效应 光折变晶体 2k反射光栅 

分 类 号：O734.2[理学—晶体学] O437[机械工程—光学工程]