Spiral bandwidth of four-wave mixing in Rb vapour
Offer, R. F. and Stulga, D. and Riis, E. and Franke-Arnold, S. and Arnold, A. S. (2018) Spiral bandwidth of four-wave mixing in Rb vapour. Communications Physics, 1. 84. ISSN 2399-3650 (https://doi.org/10.1038/s42005-018-0077-5)
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Abstract
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 420nm and 5.2um - 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 420nm 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.
ORCID iDs
Offer, R. F., Stulga, D., Riis, E. ORCID: https://orcid.org/0000-0002-3225-5302, Franke-Arnold, S. and Arnold, A. S. ORCID: https://orcid.org/0000-0001-7084-6958;-
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Item type: Article ID code: 65791 Dates: DateEvent21 November 2018Published12 October 2018Accepted21 May 2018SubmittedSubjects: Science > Physics > Optics. Light Department: Faculty of Science > Physics > Institute of Photonics
Faculty of Science > PhysicsDepositing user: Pure Administrator Date deposited: 16 Oct 2018 09:32 Last modified: 16 Sep 2024 20:33 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/65791