激光与光电子学进展, 2016, 53 (10): 102603, 网络出版: 2016-10-12  

椭圆高斯光束基于螺旋相位板产生奇点光束的特性研究 下载: 543次

Properties of Singularity Beam Produced by Elliptical Gaussian Beams Through Spiral Phase Plate
作者单位
华侨大学信息科学与工程学院, 福建 厦门 361021
摘要
基于螺旋相位板(SPP)的调制特性以及光束的近轴传输理论,获得了椭圆高斯光束通过SPP后的复振幅分布函数,对不同拓扑荷数的椭圆奇点光束在不同传输距离处的光强分布和相位分布进行了研究。结果表明:椭圆高斯光束通过SPP后随着传输距离的增大,光斑形状与初始形状相比发生改变;高阶椭圆奇点光束的光斑在传输过程中会发生一定程度的偏转,偏转方向与拓扑荷数的符号有关;高阶椭圆奇点光束在传输过程中,暗核区域发生分裂,分裂出的奇点数等于SPP所产生的椭圆奇点光束的拓扑荷数,而这种分裂情况在一阶椭圆奇点光束中不可能发生。
Abstract
Based on modulation characteristics of spiral phase plate (SPP) and the paraxial beam transmission theory, the complex amplitude function of elliptical Gaussian beams through SPP is investigated, and intensity and phase distributions of the elliptical singularity beams with different topological charges during propagation are studied. It is shown that the spot shape is changed comparing with the initial spot shape in the process of transmission with increasing of propagation distance after SPP. On the one hand, A certain amount deflection of high-order elliptical singularity beam appears, and the deflection direction is associated with the symbol of the topological charge. On the other hand, the high-order elliptical singularity beam splits in the dark nuclear area during propagation, and the number of singularities is equal to the topological charge of the original beam, which is different from the fist-order elliptical singularity beams.

王慧, 丁攀峰, 蒲继雄. 椭圆高斯光束基于螺旋相位板产生奇点光束的特性研究[J]. 激光与光电子学进展, 2016, 53(10): 102603. Wang Hui, Ding Panfeng, Pu jixiong. Properties of Singularity Beam Produced by Elliptical Gaussian Beams Through Spiral Phase Plate[J]. Laser & Optoelectronics Progress, 2016, 53(10): 102603.

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