Measuring Topological Charges of Optical Vortices with Multi-Singularity Using a Cylindrical Lens

我们在场与多重奇特测量光旋涡的拓扑的费用的一个简单方法。用一个圆柱的透镜，一根旋涡横梁能与多重分开的黑暗的洞腐烂进轻地分布，谁的数，就等于输入横梁的拓扑的费用。这个结论然后与多重奇特经由实验和旋涡横梁的繁殖的数字模拟被验证。这个方法也是可靠的与奇特的不同分布测量宽带旋涡横梁的拓扑的费用，它不诉诸多重横梁 interferometric 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 singulaxities. 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 interferometrie experiments.