In-situ measurements of light diffusion in an optically dense atomic ensemble

• URL: http://arxiv.org/abs/2409.11117v1
• Date: Tue, 17 Sep 2024 12:14:59 GMT
• Title: In-situ measurements of light diffusion in an optically dense atomic ensemble
• Authors: Antoine Glicenstein, Apoorva Apoorva, Daniel Benedicto Orenes, Hector Letellier, Alvaro Mitchell Galvão de Melo, Raphaël Saint-Jalm, Robin Kaiser,
• Abstract summary: This study introduces a novel method to investigate in-situ light transport within optically thick ensembles of cold atoms. A method for creating an optical excitation at the center of a large atomic cloud is demonstrated. In conditions where the cloud size is significantly larger than the transport mean free path, a diffusive regime is identified.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: This study introduces a novel method to investigate in-situ light transport within optically thick ensembles of cold atoms, exploiting the internal structure of alkaline-earth metals. A method for creating an optical excitation at the center of a large atomic cloud is demonstrated, and we observe its propagation through multiple scattering events. In conditions where the cloud size is significantly larger than the transport mean free path, a diffusive regime is identified. We measure key parameters including the diffusion coefficient, transport velocity, and transport time, finding a good agreement with diffusion models. We also demonstrate that the frequency of the photons launched inside the system can be controlled. This approach enables direct time- and space-resolved observation of light diffusion in atomic ensembles, offering a promising avenue for exploring new diffusion regimes.

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