中国激光, 2020, 47 (4): 0409001, 网络出版: 2020-04-09
双曲线顶点对轴锥镜聚焦柱矢量光束的影响 下载: 899次
Influence of Hyperbolic Vertex on Axicon-Focusing Cylindrical Vector Beams
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
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。
Abstract
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.
刘庆伟, 李重光, 楼宇丽, 王华英, 董昭, 桂进斌, 宋庆和, 杨力. 双曲线顶点对轴锥镜聚焦柱矢量光束的影响[J]. 中国激光, 2020, 47(4): 0409001. Liu Qingwei, Li Chongguang, Lou Yuli, Wang Huaying, Dong Zhao, Gui Jinbin, Song Qinghe, Yang Li. Influence of Hyperbolic Vertex on Axicon-Focusing Cylindrical Vector Beams[J]. Chinese Journal of Lasers, 2020, 47(4): 0409001.