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Radiation trapping in coherent media.

A B Matsko1, I Novikova, M O Scully

  • 1Department of Physics, Texas A&M University, College Station, Texas 77843-4242, USA.

Physical Review Letters
|October 3, 2001
PubMed
Summary

The decay rate of Zeeman coherence in rubidium-87 vapor increases with atomic density due to radiation trapping. This effect is crucial for understanding electromagnetically induced transparency in dense atomic media.

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Area of Science:

  • Atomic physics
  • Quantum optics

Background:

  • Zeeman coherence is generated in atomic vapors using polarized laser light.
  • Electromagnetically induced transparency (EIT) is a quantum interference effect observed in atomic media.

Purpose of the Study:

  • To investigate the relationship between atomic density and the decay rate of Zeeman coherence in rubidium-87 vapor.
  • To identify the underlying physical mechanism responsible for observed changes in coherence decay.

Main Methods:

  • Generation of Zeeman coherence in (87)Rb vapor using linearly polarized laser light.
  • Systematic variation of atomic density.
  • Measurement of the effective decay rate of Zeeman coherence.

Main Results:

  • The effective decay rate of Zeeman coherence was found to increase significantly with increasing atomic density.
  • This phenomenon was attributed to radiation trapping effects within the atomic vapor.

Conclusions:

  • Radiation trapping plays a critical role in the decoherence of Zeeman coherence in optically thick atomic media.
  • Accurate modeling of EIT experiments in dense media necessitates the inclusion of radiation trapping effects.

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