The transition from a coherent optical vortex to a Rankine vortex: beam contrast dependence on topological charge

Toninelli, E., Aspden, R. S., Phillips, D., Gibson, G. M. and Padgett, M. J. (2016) The transition from a coherent optical vortex to a Rankine vortex: beam contrast dependence on topological charge. Journal of Modern Optics, 63(Supl 3), S52-S56. (doi: 10.1080/09500340.2016.1234651)

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Abstract

Spatially coherent helically phased light beams carry orbital angular momentum (OAM) and contain phase singularities at their centre. Destructive interference at the position of the phase singularity means the intensity at this point is necessarily zero, which results in a high contrast between the centre and the surrounding annular intensity distribution. Beams of reduced spatial coherence yet still carrying OAM have previously been referred to as Rankine vortices. Such beams no longer possess zero intensity at their centre, exhibiting a contrast that decreases as their spatial coherence is reduced. In this work, we study the contrast of a vortex beam as a function of its spatial coherence and topological charge. We show that beams carrying higher values of topological charge display a radial intensity contrast that is more resilient to a reduction in spatial coherence of the source.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Gibson, Dr Graham and Phillips, Dr David and Toninelli, Mr Ermes and Aspden, Mr Reuben and Padgett, Professor Miles
Authors: Toninelli, E., Aspden, R. S., Phillips, D., Gibson, G. M., and Padgett, M. J.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Journal of Modern Optics
Publisher:Taylor & Francis
ISSN:0950-0340
ISSN (Online):1362-3044
Published Online:21 September 2016
Copyright Holders:Copyright © 2016 The Authors
First Published:First published in Journal of Modern Optics 63(Supl. 3):S51-S56
Publisher Policy:Reproduced under a Creative Commons License
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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
636381EPSRC Centre for Doctoral Training in Sensing and MeasurementAndrew HarveyEngineering & Physical Sciences Research Council (EPSRC)EP/L016753/1SCHOOL OF PHYSICS & ASTRONOMY
6672319UK Quantum Technology Hub in Enhanced Quantum ImagingMiles PadgettEngineering & Physical Sciences Research Council (EPSRC)EP/M01326X/1S&E P&A - PHYSICS & ASTRONOMY