余弦高斯光束在单轴晶体中垂直于光轴的传输  

Propagation of Cosine-Gaussian Beams in Uniaxial Crystals Orthogonal to the Optical Axis

作　　者：李艳桃[1] 张廷蓉[1] 张伟林[1] 黄永超[1] 宋宏远[1] 包建勤[1] 

机构地区：[1]四川师范大学物理与电子工程学院,四川成都610066

出　　处：《四川师范大学学报（自然科学版）》2013年第6期893-901,共9页Journal of Sichuan Normal University（Natural Science）

基　　金：四川省教育厅自然科学重点基金(09ZA089)资助项目

摘　　要：基于光束在各向异性单轴介质中的傍轴矢量传输理论,推导出余弦高斯光束在各向异性单轴晶体中垂直于光轴传输的解析公式,利用数值模拟计算方法,研究各向异性介质对余弦高斯光束偏振特性的影响.研究表明,由于晶体的各向异性,使得光束沿x方向偏振的场分布衍生出y分量.将余弦高斯光束在单轴晶体中垂直于光轴传输的特性与沿光轴传输的特性作了比较,二者位形基本相似,原来的偏振特性都不再保持.此外,余弦高斯光束在单轴晶体中垂直于光轴的传输,选择适当的参数后可在特定截面上获得类高斯、空心、近平顶等的场强分布.Based on the paraxial vectorial theory of the propagation of beams in uniaxial anisotropic media,the analytical formulas for a Cosine-Gaussian beam propagating in tmiaxial crystals orthogonal to the optical axis are derived.And some numerical simulations are preformed to study the influence of the anisotropy on the polarization properties of the Cosine-Gaussian beams.The results show that the field distribution of the beam polarized along the x-direction derives a y component.The properties of a Cosine-Gaussian beam propagating in uniaxial crystals orthogonal to the optical axis are compared with those of the beam propagating along the optical axis.The two structures are similar to each other,and the polarization property of beam cannot remain the same during propagation.In addition,as the cosine-Gaussian beams in anisotropic uniaxial crystals are perpendicular to the optical axis,a Gaussian-like,hollow,or nearly flat field distribution can be obtained on a specific section when appropriate parameters are selected,and then beam shaping can be realized.

关 键 词：晶体光学 偏振特性 傍轴矢量传输理论 余弦高斯光束 垂直光轴 各向异性 

分 类 号：O734[理学—晶体学]