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Quasi-light Storage for Optical Data Packets
07:45

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Published on: February 6, 2014

Photon lifetime in a cavity containing a slow-light medium.

T Lauprêtre1, C Proux, R Ghosh

  • 1Laboratoire Aimé Cotton, CNRS-Université Paris Sud 11, 91405 Orsay Cedex, France. thomas.laupretre@lac.u‐psud.fr

Optics Letters
|May 5, 2011
PubMed
Summary

We studied photon lifetime in a cavity with strong positive dispersion. Results show photon lifetime depends on the group velocity of light, not the phase velocity.

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Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Quantum Optics

Background:

  • Understanding light-matter interactions is crucial for quantum technologies.
  • Electromagnetically induced transparency (EIT) enables slow light propagation.
  • Cavity quantum electrodynamics studies photon behavior within resonant structures.

Purpose of the Study:

  • To experimentally determine the factors governing photon lifetime in an optical cavity.
  • To investigate the role of dispersion in photon decay within a cavity.
  • To compare the influence of group velocity versus phase velocity on photon lifetime.

Main Methods:

  • Experimental setup utilizing a cavity with metastable helium gas.
  • Achieving electromagnetically induced transparency (EIT) for slow light.
  • Measuring photon lifetime within the cavity under strong positive dispersion.

Main Results:

  • Demonstrated slow light propagation with group velocity around 10⁴ m·s⁻¹.
  • Observed that photon lifetime is directly influenced by the group velocity of light.
  • Confirmed that phase velocity does not dictate photon lifetime in this system.

Conclusions:

  • Photon lifetime in optical cavities with strong positive dispersion is governed by group velocity.
  • Experimental evidence supports the role of group velocity in cavity photon dynamics.
  • Findings have implications for controlling light propagation and storage in optical systems.