晶体球中非相位匹配二次谐波产生及最佳聚焦条件  

Non-Phase-Matched Second Harmonic Generation and Optimum Focusing Condition in Crystal Sphere

作　　者：阎江[1] 杨学林[1] 李浩文 谢绳武[1] 丁良恩[2] 

机构地区：[1]上海交通大学应用物理系,上海2002402 [2]华东师范大学量子光学开放实验室,上海200062

出　　处：《光学学报》2000年第12期1596-1601,共6页Acta Optica Sinica

基　　金：上海市自然科学基金;国家教委博士点基金资助项目

摘　　要：晶体球法是近年来在国际上发展起来的一种测量非线性系数的新方法。根据聚焦高斯光束二次谐波产生的孔径方程理论 ,分析了晶体球中的第 类非相位匹配二次谐波产生过程 ,讨论了晶体球中第 类非相位匹配二次谐波最佳聚焦参数的选择。报道了 L i Nb O3晶体球中皮秒激光脉冲抽运的非相位匹配二次谐波实验。The sphere method is a newly developed technique for mesurement of nonlinear optical coefficients in crystals. Based on the theory of aperture function of the focused Gaussian beam SHG, the non phase matched (NPM) SHG process in a crystal sphere is analyzed, and the optimum focus condition of type Ⅰ NPM SHG is discussed. The experiment of NPM SHG in a LiNbO 3 crystal sphere pumped with a pico second laser pulse is reported. The experimental results agree well with the theoretical prediction.

关 键 词：晶体球 高斯光束 非相位匹配 二次谐波产生 

分 类 号：O734.1[理学—晶体学]