Open AccessSimultaneous measurement of orbital angular momentum spectra in a turbulent atmosphere without probe beam compensation
Author(s) -
Hui Zhang,
Wenjie Zheng,
Guochen Zheng,
Peng Fu,
Jun Qu,
B.J. Hoenders,
Yangjian Cai,
Yangsheng Yuan
Publication year - 2021
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.440147
Subject(s) - optics , physics , angular momentum , axicon , bessel function , beam (structure) , turbulence , orbital angular momentum multiplexing , bessel beam , free space optical communication , light beam , optical communication , orbital angular momentum of light , laser , laser beams , total angular momentum quantum number , classical mechanics , thermodynamics
In free-space optical (FSO) communications, the orbital angular momentum (OAM) multiplexing/demultiplexing of Bessel beams perturbed by atmospheric turbulence is of great significance. We used the Gerchberg-Saxton algorithm without a beacon beam to compensate for the aberrant helical phase of the Bessel beam distorted by the turbulent atmosphere. The optical vortex Dammann axicon grating was applied for the simultaneous measurement of the intensities of the demodulated spectra of the OAM modes of the Bessel beams disturbed by atmospheric turbulence. The experimental results demonstrate that the distorted phase of the Bessel beam can be compensated and the mode purity of the target OAM mode is enhanced from 0.85 to 0.92 in case of weak turbulence. Our results will improve the quality of the OAM modes of Bessel beam (de)multiplexing in FSO communication systems.