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Related Experiment Videos

Coherent light transport in a cold strontium cloud.

Y Bidel1, B Klappauf, J C Bernard

  • 1Laboratoire Ondes et Désordre, FRE 2302, 1361 route des Lucioles F-06560 Valbonne, France.

Physical Review Letters
|May 15, 2002
PubMed
Summary

Researchers studied light transport in cold strontium atoms, observing coherent backscattering. The findings confirm that atomic structure influences light scattering, explaining previous observations in rubidium cold clouds.

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Area of Science:

  • Atomic Physics
  • Quantum Optics
  • Condensed Matter Physics

Background:

  • Weak localization describes enhanced backscattering of light due to constructive interference.
  • The internal structure of atoms can influence light propagation and scattering phenomena.
  • Previous studies with rubidium atoms showed reduced contrast in coherent backscattering, attributed to atomic structure.

Purpose of the Study:

  • To investigate light coherent transport in the weak localization regime.
  • To measure the coherent backscattering cone in strontium atoms.
  • To understand the role of atomic internal structure in light scattering phenomena.

Main Methods:

  • Utilized magneto-optically cooled strontium atoms.
  • Measured the coherent backscattering cone across four polarization channels.

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  • Employed light resonant with a J(g) = 0-->J(e) = 1 transition of strontium.

    • Main Results:

    • Observed an enhancement factor close to 2 in the helicity-preserving channel.
    • Results align with theoretical predictions for coherent backscattering.
    • Confirmed the significant effect of atomic internal structure on scattering contrast.

    Conclusions:

    • The internal atomic structure is a key factor in reducing the contrast of coherent backscattering.
    • Experimental findings are consistent with Monte Carlo simulations including geometric effects.
    • Provides insights into light-matter interactions in cold atomic systems.