Propagation of a vortex elliptical Airy beam
Propagation of a vortex elliptical Airy beam
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涡旋椭圆艾里光束的传播
DOI：
10.1016/j.optcom.2018.06.066
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发表时间：
2018-11
影响因子：
2.4
通讯作者：
Chu Xiuxiang
中科院分区：
文献类型：
--
作者：
Xie Wenke;Zhang Pan;Wang Hui;Chu Xiuxiang
由于椭圆光束具有许多特殊的性质和应用，人们提出了一种既有涡旋相位又有无涡旋相位的椭圆艾里光束。根据椭圆艾利光束的定义，给出了产生椭圆艾利光束的实验装置，并推导了光强演化的公式。同时，从艾里光束在真空中的传输出发，推导出了突然自聚焦长度。基于突变自聚焦长度公式，分析和讨论了一些特殊位置的光强分布，特别是在自聚焦点处的光强分布。研究表明，由于椭圆艾里光束强度分布的不对称性和圆形艾里光束在传输过程中的突然自聚焦，改变了一些有趣的强度分布。椭圆艾里光束的不同偏心率具有相似的性质，如光束随传输距离分裂，由于会聚过程沿x轴和y轴不同步，改造后的光束在某些位置呈光刀形状(非常窄的光束)。当我们在椭圆艾里光束上加一个涡旋时，光强分布会随着传输距离的变化而发生旋转和分裂。
Because elliptical beams have many special properties and applications, an elliptical Airy beam with and without a vortex phase has been proposed. Based on the definition of the elliptical Airy beam, an experimental setup for the generation is given, and the formula for the evolution of the intensity is derived. Meanwhile, from the propagation of the Airy beam in vacuum, the abruptly autofocusing length is derived. Based on the formula of the abruptly autofocusing length, the intensity distributions at some special locations are analyzed and discussed, especially in the autofocusing point. Study shows that some interesting intensity profiles are reformed due to the asymmetry intensity distribution of the elliptical Airy beam and abrupt autofocusing of the circular Airy beam during propagation. The different eccentricity of the elliptical Airy beam has similar properties, such as the beam split with the propagation distance and the reformed beam shaped like a ”light knife” (very narrow beam) at some positions due to the convergence process out of synchronization along the x- and y-axis. When we impart a vortex on the elliptical Airy beam, the intensity distribution will rotate and split with the propagation distance.
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