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Polarisation rotation of slow light with orbital angular momentum in
ultracold atomic gases | | J. Ruseckas
; G. Juzeliunas
; P. Ohberg
; S.M. Barnett
; | | Date: |
4 Jun 2007 | | 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 analysing 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 polarisation plane of linearly polarised
light. To extract a pure rotational phase shift, we suggest to measure a
difference in the angle of the polarisation plane rotation by two consecutive
light beams with opposite OAM. The differential angle $Deltaalpha_{ell}$ is
proportional to the rotation frequency of the medium $omega_{mathrm{rot}}$
and the winding number $ell$ of light, and is inversely proportional to the
group velocity of light. For slow light the angle $Deltaalpha_{ell}$ should
be large enough to be detectable. The effect can be used as a tool for
measuring the rotation frequency $omega_{mathrm{rot}}$ of the medium. | | Source: | arXiv, arxiv.0706.0477 | | Services: | Forum | Review | PDF | Favorites | |
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