Denisenko Vladimir, Shvedov Vladlen, Desyatnikov Anton S, Neshev Dragomir N, Krolikowski Wieslaw, Volyar Alexander, Soskin Marat, Kivshar Yuri S
Nonlinear Physics Centre, Research School of Physics and Engineering, The Australian National University, Canberra ACT 0200, Australia.
Opt Express. 2009 Dec 21;17(26):23374-9. doi: 10.1364/OE.17.023374.
We introduce a simple, single beam method for determination of the topological charge of polychromatic optical vortices. It is based on astigmatic transformation of singular optical beams, where the intensity pattern of a vortex beam acquires a form of dark stripes in the focal plane of a cylindrical lens. The number of the dark stripes is equal to the modulus of the vortex topological charge, while the stripe tilt indicates the charge sign. We demonstrate experimentally the effectiveness of this technique by revealing complex topological structure of polychromatic singular beams.
我们介绍一种用于确定多色光学涡旋拓扑电荷的简单单光束方法。它基于奇异光束的像散变换，其中涡旋光束的强度图案在柱面透镜的焦平面上呈现为暗条纹的形式。暗条纹的数量等于涡旋拓扑电荷的模，而条纹的倾斜表示电荷的符号。我们通过揭示多色奇异光束的复杂拓扑结构，实验证明了该技术的有效性。
