Composite optical vortices in noncollinear Laguerre–Gaussian beams and their propagation in free space

被引：4

作者：

程科 ^{[1
]}

刘普生 ^{[1
]}

吕百达 ^{[1
]}

机构：

[1] Institute of Laser Physics and Chemistry, Sichuan University

来源：

Chinese Physics B | 2008年 / 05期

基金：

中国国家自然科学基金;

关键词：

composite optical vortex; Laguerre–Gaussian beam; topological charge; creation and annihilation;

D O I：

暂无

中图分类号：

O437 [非线性光学（强光与物质的作用）];

学科分类号：

070207 ; 0803 ;

摘要：

Taking two Laguerre–Gaussian beams with topological charge l = ±1 as an example, this paper studies the composite optical vortices formed by two noncollinear Laguerre–Gaussian beams with different phases, amplitudes, waist widths, off-axis distances, and their propagation in free space. It is shown by detailed numerical illustrative examples that the number and location of composite vortices at the waist plane are variable by varying the relative phase β, amplitude ratio η, waist width ratio ξ, or off-axis distance ratio μ. The net topological charge l net is not always equal to the sum l sum of charges of the two component beams. The motion, creation and annihilation of composite vortices take place in the free-space propagation, and the net charge during the propagation remains unchanged and equals to the net charge at the waist plane.

引用

页码：1743 / 1751

页数：9