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Characteristics of the diffraction field and the topological charge judging of the bended vortex beams through a double slit

X. F. HE1, L. CHEN1,* , Y. H. HU1, Q. D. QIU1

Affiliation

  1. Guangdong University of Technology, School of Physics and Optoelectronic Engineering, Guangzhou, China. 510006

Abstract

The isophase line will be bended when a vortex beam propagation a certain distance, and the topological charge of this vortex beam cannot be got exactly as usually because of the interference fringe distortion by a double slit. The characteristics of the diffraction field of the bended vortex beams through a double slit are discussed. The bending phenomenon causes the interference fringe distortion at both ends of the stripe. A new improved method to judge the topological charge accurately and easily by counting the number of bright spots is proposed here.Thesimulating results show that the topological number is equal to the number of the bright spots plus one..

Keywords

Vortex Beam, Isophase Line, Double Slit, Topological Charge.

Submitted at: Oct. 8, 2014
Accepted at: Sept. 9, 2015

Citation

X. F. HE, L. CHEN, Y. H. HU, Q. D. QIU, Characteristics of the diffraction field and the topological charge judging of the bended vortex beams through a double slit, Journal of Optoelectronics and Advanced Materials Vol. 17, Iss. 9-10, pp. 1494-1499 (2015)