Gouy phase-matched angular and radial mode conversion in four-wave mixing

Offer, Rachel F. and Daffurn, Andrew and Riis, Erling and Griffin, Paul F. and Arnold, Aidan S. and Franke-Arnold, Sonja (2021) Gouy phase-matched angular and radial mode conversion in four-wave mixing. Physical Review A - Atomic, Molecular, and Optical Physics, 103 (2). L021502. ISSN 2469-9934 (https://doi.org/10.1103/PhysRevA.103.L021502)

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Abstract

Studying the conversion between transverse light modes via four-wave mixing in a heated rubidium vapor, we demonstrate and explain a transfer between azimuthal and radial mode numbers. They relate to orthogonal modal dimensions, which one would not normally expect to interact. While angular momentum conservation in this nonlinear process dictates the selection rules for the angular mode number, the role of the radial mode number is more esoteric. We demonstrate systematically that the Gouy phase is the key to understanding this conversion, leading to strikingly different conversion behavior in the thick- and thin-medium regimes. Our experimental investigation of the transition between these regimes bridges the gap between previous experiments in atomic thick media and work in nonlinear crystals. Our work sets a clear starting point to explore the thick-medium regime, allowing efficient radial-to-azimuthal and radial-to-radial mode conversion.

  • Item type:Article
    ID code:75610
    Dates:
    Date
    Event
    26 February 2021
    Published
    8 February 2021
    Accepted
    27 July 2020
    Submitted
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:03 Mar 2021 10:11
    Last modified:14 Apr 2024 00:53
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/75610
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