环状平顶光束在单轴晶体中垂直于光轴的传输特性  

Propagation properties of annular flat-topped beams orthogonal to the optical axis in uniaxial crystals

作　　者：张伟林[1,2] 张廷蓉[1] 李艳桃[1] 包建勤[1] 霍雅洁[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 [2]重庆市潼南中学校,重庆402660

出　　处：《光电子．激光》2012年第8期1616-1624,共9页Journal of Optoelectronics·Laser

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介质中的傍轴矢量传输理论,对环状平顶光束在单轴晶体中垂直于光轴的传输作了研究,导出了偏振场的慢变振幅表达式,并通过数值计算分析了光束的传输特性。结果表明,环状平顶光束在单轴晶体中垂直于光轴传输时,晶体的各向异性对其光强分布有较大影响,在正单轴晶体远场处ne/no值越大,光强越小,光束在xy平面内扩散越小;在负单轴晶体中传输性质则相反;随传输距离z的增加,中心光强逐渐加强,光强分布不再保持原来暗中空分布的特性。Based on the paraxial vectorial theory of beam propagation in uniaxial anisotropic media,the propagation of annular flat-topped beams orthogonal to the optical axis in uniaxial crystal is studied,and the polarization field of the amplitude expression has been derived. According to the numerical calculation results, propagation properties of the beam have been analyzed. It is shown that the distribution of intensity is greatly affected by anisotropy of crystal when the annular flat-topped beams propagate in uniaxial crystals orthogonal to the optical axis. For the beam in the positive uniaxial crystal in the far-field,with the increase of ne/no ,the intensity and spread of the beam in the xy plane decrease. Propagation proper- ties of the beam in negative urfiaxial crystal are opposite. With the increasing of ne/no the beam propagation distance z, the central intensity will increase gradually, and the distribution of intensity does not remain the original hollow nature.

关 键 词：环状平顶光束 单轴晶体 各向异性 传输 

分 类 号：O734[理学—晶体学]