Measuring Topological Charges of Optical Vortices with Multi-Singularity Using a Cylindrical Lens
PENG Yu, GAN Xue-Tao, JU Pei, WANG Ya-Dong, ZHAO Jian-Lin**
Key Laboratory of Space Applied Physics and Chemistry (Ministry of Education), and Shaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University, Xi'an 710072
Abstract：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.
. [J]. 中国物理快报, 2015, 32(02): 24201-024201.
PENG Yu, GAN Xue-Tao, JU Pei, WANG Ya-Dong, ZHAO Jian-Lin. Measuring Topological Charges of Optical Vortices with Multi-Singularity Using a Cylindrical Lens. Chin. Phys. Lett., 2015, 32(02): 24201-024201.
2015, Vol. 32 
