二次谐波产生过程中准相位匹配条件的研究  

Investigation on quasi-phase-matching in second harmonic generation

作　　者：赵丽明[1] 周云松[1] 郑鹉[1] 

机构地区：[1]首都师范大学物理系,北京100048

出　　处：《大学物理》2011年第7期23-25,共3页College Physics

基　　金：北京市优秀人才项目(20081D0501600193)资助;北京市教委项目(Grant No.09224010007)资助;北京市自然基金(1102012)资助

摘　　要：从耦合波基本方程出发,在实空间严格推导出二次谐波产生(SHG)过程中的准相位匹配(QPM)条件.讨论了满足QPM条件时,SHG的转换效率以及相位失配角随波传播距离的变化.着重研究了非线性极化率的周期性调制对提高SHG转换效率的贡献.We propose a new way to obtain so-called quasi-phase-matching（QPM） condition in the second harmonic generation（SHG） in the real space.The QPM-SHG can be deduced by solving the coupled wave equation.The mismatched angle as a function of x is discussed.We find that a phase shift of 180° can be obtained from the reversion of ferroelectric domain,this restores the phase relation between the interacting waves,thus the SHG conversion efficiency grows continuously.

关 键 词：非线性光学 二次谐波产生 耦合波方程 准相位匹配 

分 类 号：O432.12[机械工程—光学工程]