Open AccessMeasuring the orbital angular momentum of light beams by using a single intensity distribution
Author(s) -
Alexey A. Kovalev,
V. V. Kotlyar,
D. S. Kalinkina
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1400/6/066025
Subject(s) - superposition principle , physics , angular momentum , optics , angular spectrum method , intensity (physics) , orbital angular momentum of light , orbital angular momentum multiplexing , diffuser (optics) , gaussian , transverse plane , plane (geometry) , computational physics , total angular momentum quantum number , classical mechanics , quantum mechanics , mathematics , diffraction , geometry , light source , engineering , structural engineering
Here, we modify and study a method for measuring the orbital angular momentum (OAM) based on angle-averaged intensity in a single transverse plane. We also simulate propagation of a superposition of two Laguerre-Gaussian modes after passing through a diffuser with a random phase. Despite the distortions caused by the diffuser, the modified method allows OAM measurement with an average error less than 10%. The main advantages of the described technique is that (i) simultaneously with the full OAM the OAM spectrum is obtained and (ii) no any optical elements are needed.