Measuring Topological Charges of Optical Vortices with Multi-Singularity Using a Cylindrical Lens
Measuring Topological Charges of Optical Vortices with Multi-Singularity Using a Cylindrical Lens
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DOI：
10.1088/0256-307x/32/2/024201
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发表时间：
2015-01
影响因子：
3.5
通讯作者：
P. Yu;Gan Xue-tao;Ju Pei;Wang Ya-dong;Zhao Jian-Lin
中科院分区：
文献类型：
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作者：
P. Yu;Gan Xue-tao;Ju Pei;Wang Ya-dong;Zhao Jian-Lin
我们提出了一种简单的方法来测量具有多个奇点的光学涡旋的拓扑电荷。使用柱面透镜，涡旋光束可以衰减成具有多个分离的黑洞的光场分布，其数量恰好等于输入光束的拓扑电荷。然后通过具有多个奇点的涡旋光束传播的实验和数值模拟验证了这一结论。该方法也能可靠地测量具有不同奇点分布的宽带涡旋光束的拓扑电荷，且无需借助多光束干涉实验。
We present a simple method to measure the topological charges of optical vortices with multiple singularities. Using a cylindrical lens, a vortex beam can decay into a light field distribution with multiple separated dark holes, whose number just equals the topological charge of the input beam. This conclusion is then verified via experiments and numerical simulations of the propagation of vortex beams with multiple singularities. This method is also reliable to measure the topological charges of broadband vortex beams with different distributions of singularities, which does not resort to multiple beam interferometric experiments.