摘要
基于瑞利-索末菲矢量衍射理论和振幅透过率函数,研究了轴锥镜的柱矢量光束聚焦特性。研究结果表明,径向偏振光的矢量聚焦场由径向分量及轴向分量构成,而角向偏振光的矢量聚焦场仅由角向分量构成,同时聚焦场焦深随束腰半径的增大而增加。相较理想情况,锥顶为双曲线时,焦深几乎不变,但光强因干涉效应发生振荡,其依赖于入射光的束腰半径,当径向偏振光束腰半径达到4 mm,角向偏振光束腰半径达到3.5 mm时,振荡现象消失。研究结果为轴锥镜的实际应用,以及进一步完善柱矢量光束聚焦场理论提供了参考。
In this study,we investigate the axicon-focusing characteristics of a cylindrical vector beam based on the Rayleigh-Sommerfeld vector diffraction theory and the amplitude transmittance function.The results prove that the vector focus field of a radially polarized beam comprises radial and longitudinal components,whereas that of an azimuthally polarized beam only comprises an azimuthal component.Further,the focus depth of the focus field increases with the increasing waist radius of the beam.When compared with the ideal case,the focal depth of the focus field remains almost unchanged when the axicon apex is hyperbola;however,its intensity oscillates because of the interference effect,which is dependent on the waist radius of the incident beam.This oscillation phenomenon disappears when the waist radius of the radially and azimuthally polarized beams are 4 mm and 3.5 mm,respectively.The obtained results provide a reference for the practical application of the axicon systems and the improvement of the theory of cylindrical vector beam focusing.
作者
刘庆伟
李重光
楼宇丽
王华英
董昭
桂进斌
宋庆和
杨力
Liu Qingwei;Li Chongguang;Lou Yuli;Wang Huaying;Dong Zhao;Gui Jinbin;Song Qinghe;Yang Li(Key Laboratory of Laser Information Processing Technology and Application,College of Science,Kunming University of Science and Technology,Kunming,Yunnan 650500,China;College of Mathematics&Physics,Hebei University of Engineering,Handan,Hebei 056038,China)
出处
《中国激光》
EI
CAS
CSCD
北大核心
2020年第4期235-245,共11页
Chinese Journal of Lasers
基金
国家自然科学基金(61465005,61565011,61540075)
云南省级人培基金(KKSY201407082)
河北科技计划项目(16273901D)。
关键词
衍射
矢量衍射理论
双曲线顶点
柱矢量光束
束腰半径
振荡现象
diffraction
vector diffraction theory
hyperbolic vertex
cylindrical vector beams
waist radius
oscillation phenomenon
作者简介
楼宇丽,E-mail:578928841@qq.com。
