Divergence of an orbital-angular-momentum-carrying beam upon propagation

Padgett, M. J. , Miatto, F. M., Lavery, M. P.J., Zeilinger, A. and Boyd, R. W. (2015) Divergence of an orbital-angular-momentum-carrying beam upon propagation. New Journal of Physics, 17(2), 023011. (doi:10.1088/1367-2630/17/2/023011)

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Publisher's URL: http://dx.doi.org/10.1088/1367-2630/17/2/023011

Abstract

There is recent interest in the use of light beams carrying orbital angular momentum (OAM) for creating multiple channels within free-space optical communication systems. One crucial issue is that, for a given beam size at the transmitter, the beam divergence angle increases with increasing OAM. Therefore the larger the value of OAM, the larger the aperture required at the receiving optical system if the efficiency of detection is to be maintained. Confusion exists as to whether this divergence scales linearly with, or with the square root of, the beam's OAM. We clarify how both these scaling laws are valid, depending upon whether it is the radius of the waist of the beam's Gaussian term or the radius of rms intensity of the beam that is kept constant while varying the OAM.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Lavery, Dr Martin and Padgett, Professor Miles and Boyd, Professor Robert
Authors: Padgett, M. J., Miatto, F. M., Lavery, M. P.J., Zeilinger, A., and Boyd, R. W.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:New Journal of Physics
Publisher:IOP Publishing
ISSN:1367-2630
Copyright Holders:Copyright © 2015 The Authors
First Published:First published in New Journal of Physics 17(2):023011
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
549871Challenges in Orbital Angular MomentumMiles PadgettEngineering & Physical Sciences Research Council (EPSRC)EP/I012451/1P&A - PHYSICS & ASTRONOMY
549872Challenges in Orbital Angular MomentumMiles PadgettEngineering & Physical Sciences Research Council (EPSRC)EP/I012451/1P&A - PHYSICS & ASTRONOMY