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Polarization rotation of slow light with orbital angular momentum in ultracold atomic gases

Ruseckas, Julius and Juzelinas, Gediminas and Ohberg, Patrik and Barnett, Stephen M. (2007) Polarization rotation of slow light with orbital angular momentum in ultracold atomic gases. Physical Review A, 76 (5). ISSN 1050-2947

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    Abstract

    We consider the propagation of slow light with an orbital angular momentum (OAM) in a moving atomic medium. We have derived a general equation of motion and applied it in analyzing propagation of slow light with an OAM in a rotating medium, such as a vortex lattice. We have shown that the OAM of slow light manifests itself in a rotation of the polarization plane of linearly polarized light. To extract a pure rotational phase shift, we suggest to measure a difference in the angle of the polarization plane rotation by two consecutive light beams with opposite OAM. The differential angle Deltaalphal is proportional to the rotation frequency of the medium omegarot and the winding number l of light, and is inversely proportional to the group velocity of light. For slow light the angle Deltaalphal should be large enough to be detectable. The effect can be used as a tool for measuring the rotation frequency omegarot of the medium.

    Item type: Article
    ID code: 5675
    Keywords: atomic line shapes, polarization, atomic gases, Optics. Light, Atomic and Molecular Physics, and Optics
    Subjects: Science > Physics > Optics. Light
    Department: Faculty of Science > Physics
    Related URLs:
    Depositing user: Strathprints Administrator
    Date Deposited: 13 Mar 2008
    Last modified: 04 Sep 2014 23:59
    URI: http://strathprints.strath.ac.uk/id/eprint/5675

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