title: Method for exploring the orbital angular momentum of an optical vortex beam with a triangular multipoint plate.
abstract: An efficient method for exploring the orbital angular momentum of an optical vortex beam is provided. The method, based on a triangular multipoint plate, can easily determine both the sign and the magnitude of the topological charge of the optical vortices. We demonstrate its feasibility by measuring the orbital angular momentum of Laguerre-Gaussian laser beams.
authors.affiliation: College of Information Science and Engineering, Institute of Optics and Photonics, Huaqiao University, Xiamen, Fujian 361021, China.
authors.forename: Yongxin
authors.initials: Y
authors.lastname: Liu
authors.forename: Jixiong
authors.initials: J
authors.lastname: Pu
authors.forename: Baida
authors.initials: B
authors.lastname: Lü