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Slow Diffusion of Light in a Cold Atomic Cloud

Abstract : We study the diffusive propagation of multiply scattered light in an optically thick cloud of cold rubidium atoms illuminated by a quasiresonant laser beam. In the vicinity of a sharp atomic resonance, the energy transport velocity of the scattered light is almost 5 orders of magnitude smaller than the vacuum speed of light, reducing strongly the diffusion constant. We verify the theoretical prediction of a frequency-independent transport time around the resonance. We also observe the effect of the residual velocity of the atoms at long times.
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Submitted on : Thursday, May 4, 2006 - 4:09:08 PM
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Guillaume Labeyrie, E. Vaujour, Cord A. Mueller, Dominique Delande, Christian Miniatura, et al.. Slow Diffusion of Light in a Cold Atomic Cloud. Physical Review Letters, American Physical Society, 2003, 91, pp.223904. ⟨10.1103/PhysRevLett.91.223904⟩. ⟨hal-00023807⟩



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