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.
© 2011 Optical Society of America
Lasers and Laser Optics
Original Manuscript: April 28, 2011
Revised Manuscript: June 18, 2011
Manuscript Accepted: June 18, 2011
Published: August 17, 2011
Yongxin Liu, Jixiong Pu, and Baida Lü, "Method for exploring the orbital angular momentum of an optical vortex beam with a triangular multipoint plate," Appl. Opt. 50, 4844-4847 (2011)