Spiral bandwidth of four-wave mixing in Rb vapour

Offer, R.F., Stulga, D., Riis, E., Franke-Arnold, S. and Arnold, A.S. (2018) Spiral bandwidth of four-wave mixing in Rb vapour. Communications Physics, 1, 84. (doi: 10.1038/s42005-018-0077-5)

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Laguerre-Gauss beams, and more generally the orbital angular momentum of light (OAM) provide valuable research tools for optical manipulation, processing, imaging and communication. High-efficiency frequency conversion of OAM is possible via four-wave mixing in rubidium vapour. Conservation of the OAM in the two pump beams determines the total OAM shared by the generated light fields at 420 nm and 5.2 μm—but not its distribution between them. Here we experimentally investigate the spiral bandwidth of the generated light modes as a function of pump OAM. A small pump OAM is transferred almost completely to the 420 nm beam. Increasing the total pump OAM broadens the OAM spectrum of the generated light, indicating OAM entanglement between the generated light fields. This clears the path to high-efficiency OAM entanglement between widely disparate wavelengths.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Franke-Arnold, Professor Sonja
Authors: Offer, R.F., Stulga, D., Riis, E., Franke-Arnold, S., and Arnold, A.S.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Communications Physics
Publisher:Nature Research
ISSN (Online):2399-3650
Copyright Holders:Copyright © 2018 The Authors
First Published:First published in Communications Physics 1: 84
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
637131Quantum memory and processing of orbital angular momentum information in atomic gassesSonja Franke-ArnoldLeverhulme Trust (LEVERHUL)RPG-2013-386S&E P&A - PHYSICS & ASTRONOMY