被圆相位片衍射的空心高斯光束的远场矢量结构特征  

Vectorial structure of a hollow Gaussian beam diffracted by a circular phase aperture in the far field

作　　者：陆世专[1] 游开明[1] 陈列尊[1] 王友文[1] 杨辉[1] 戴志平[1] 

机构地区：[1]衡阳师范学院物理与电子信息科学系,衡阳421008

出　　处：《物理学报》2012年第23期209-216,共8页Acta Physica Sinica

基　　金：湖南省教育厅科研项目(批准号:11A018);湖南省自然科学基金(批准号:11JJ3076)资助的课题~~

摘　　要：基于麦克斯韦方程组解的矢量角谱表述与稳相法,在仅有远场近似的条件下,得到了被圆相位片衍射的空心高斯光束远场能流密度分布的解析表达式.结果表明,光束的总能流可以表示为自由项与附加项之和,其中附加项是相位片对能流分布的影响;总能流、自由项能流、附加项能流又可以分别表示为各自的TE项和TM项之和.利用所导出的公式,描绘了空心高斯光束的总能流、自由项能流、附加项能流及其各自的TE项与TM项能流的横截面分布图.讨论了截断参数与附加相移对纵向总能流分布的影响.Based on the vector angular spectrum representation of the Maxwell equations and the method of stationary phase, only with the far field approximation, the analytical expressions of energy flux density of a hollow Gaussian beam diffracted by a circular phase aperture is presented. It is shown that the total energy flux of the beam can be expressed as the sum of the unapertured term and the additional term, where the additional term is the effect of the phase aperture on the beam; the total energy flux, the unapertured one and the additional one each can be expressed as the sum of TE term and TM term. The distributions of the total energy flux, the unapertuered one, the additional one, and their TE terms and TM terms are depicted in the far field. The influences of truncation parameter δ and the phase delay β on the longitudinal total energy flux distributions are discussed.

关 键 词：空心高斯光束 矢量结构 相位片 

分 类 号：TN21[电子电信—物理电子学]