中国激光, 2015, 42 (7): 0702004, 网络出版: 2022-09-24   

部分相干高斯涡旋光束电场和磁场的光谱Stokes奇点

Electric and Magnetic Spectral Stokes Singularities of Partially Coherent Gaussian Vortex Beams
作者单位
1 泸州医学院生物医学工程系, 四川 泸州 646000
2 宜宾学院计算物理重点实验室, 四川 宜宾 644000
3 四川大学激光物理与化学研究所, 四川 成都 610064
摘要
以傍轴高斯涡旋光束为例,对部分相干涡旋光束的磁场在源平面的光谱Stokes奇点变化规律做了研究,并与部分相干光束电场的光谱Stokes奇点做了比较。研究结果表明,部分相干高斯涡旋光束在源平面内,存在着磁场和电场的光谱Stokes奇点。适当改变光束束腰宽度以及离轴量等光束控制参数会出现磁场和电场的光谱Stokes奇点的移动、产生和湮灭。与部分相干光束电场的光谱Stokes奇点比较表明,二者并不重合且拓扑电荷不同,但具有一定的对称性。磁场和电场的光谱Stokes奇点在变化过程中满足拓扑关系。
Abstract
Taking the paraxial Gaussian vortex beam as an example, the variation of magnetic spectral Stokes singularities of partially coherent beams is studied at the source plane and compared with electric spectral Stokes singularities of partially coherent beams. It is shown that at the source plane there exists magnetic and electric spectral Stokes singularities of partially coherent Gaussian vortex beams. By suitably varying the beam waist width and off-axis parameter, the motion, creation, and annihilation of magnetic and electric spectral Stokes singularities will take place. In comparison with the electric spectral Stokes singularities of partially coherent beams, they do not coincide and the topological charges are not the same. But there exists a certain symmetry, and in the process, they satisfy the topological relation.
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罗亚梅, 唐碧华, 高曾辉, 吕百达. 部分相干高斯涡旋光束电场和磁场的光谱Stokes奇点[J]. 中国激光, 2015, 42(7): 0702004. Luo Yamei, Tang Bihua, Gao Zenghui, Lü Baida. Electric and Magnetic Spectral Stokes Singularities of Partially Coherent Gaussian Vortex Beams[J]. Chinese Journal of Lasers, 2015, 42(7): 0702004.

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