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In Situ Measurements of Light Diffusion in an Optically Dense Atomic Ensemble.

Antoine Glicenstein1, Apoorva Apoorva1, Daniel Benedicto Orenes1

  • 1<a href="https://ror.org/019tgvf94">Université Côte d'Azur</a>, CNRS, <a href="https://ror.org/042cesy50">Institut de Physique de Nice</a>, 06200 Nice, France.

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This summary is machine-generated.

Researchers developed a new method to study light diffusion in cold atomic clouds. This technique allows direct observation of light scattering and identifies a diffusive regime in optically thick atomic ensembles.

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Area of Science:

  • Atomic physics
  • Quantum optics
  • Condensed matter physics

Background:

  • Understanding light transport in complex media is crucial for various scientific fields.
  • Optically thick atomic ensembles present unique challenges for studying light propagation due to multiple scattering events.

Purpose of the Study:

  • To introduce a novel method for investigating in-situ light transport in optically thick cold atom ensembles.
  • To observe and characterize the diffusive regime of light propagation within these systems.

Main Methods:

  • Utilizing the internal structure of alkaline-earth metals for optical excitation.
  • Creating an optical excitation at the center of a large atomic cloud.
  • Observing light propagation through multiple scattering events.

Main Results:

  • Demonstrated a method for controlled optical excitation within atomic clouds.
  • Identified a diffusive regime when the cloud size exceeds the transport mean free path.
  • Measured key diffusion parameters (diffusion coefficient, transport velocity, transport time) showing agreement with diffusion models.

Conclusions:

  • The developed method allows for direct, time- and space-resolved observation of light diffusion in atomic ensembles.
  • This approach provides a promising platform for exploring novel diffusion regimes in quantum systems.