Open AccessMode conversion efficiency to Laguerre-Gaussian OAM modes using spiral phase optics
Author(s) -
A. Longman,
R. Fedosejevs
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.017382
Subject(s) - optics , physics , optical vortex , spiral (railway) , fresnel number , azimuth , gaussian beam , energy conversion efficiency , phase (matter) , laguerre polynomials , bandwidth (computing) , beam (structure) , diffraction , mathematics , optoelectronics , computer science , quantum mechanics , mathematical analysis , telecommunications
An analytical model for the conversion efficiency from a TEM 00 mode to an arbitrary Laguerre-Gaussian (LG) mode with null radial index spiral phase optics is presented. We extend this model to include the effects of stepped spiral phase optics, spiral phase optics of non-integer topological charge, and the reduction in conversion efficiency due to broad laser bandwidth. We find that through optimization, an optimal beam waist ratio of the input and output modes exists and is dependent upon the output azimuthal mode number.