Realistic theory of electromagnetically induced transparency and slow light in a hot atomic vapor

R. Ghosh; J. Ghosh; F. Goldfarb; J.-L. Le Gouët; F. Bretenaker

doi:10.1117/12.816344

2 February 2009 Realistic theory of electromagnetically induced transparency and slow light in a hot atomic vapor

R. Ghosh, J. Ghosh, F. Goldfarb, J.-L. Le Gouët, F. Bretenaker

Proceedings Volume 7226, Advances in Slow and Fast Light II; 72260J (2009) https://doi.org/10.1117/12.816344
Event: SPIE OPTO: Integrated Optoelectronic Devices, 2009, San Jose, California, United States

Abstract

We present a realistic theoretical treatment of a three-level Λ system in a hot atomic vapor interacting with a coupling and a probe field of arbitrary strengths, leading to electromagnetically-induced transparency and slow light under the two-photon resonance condition. We take into account all the relevant decoherence processes including collisions. Velocity-changing collisions (VCCs) are modeled in the strong collision limit effectively, which helps in achieving optical pumping by the coupling beam across the entire Doppler profile. We take into account a dynamic rate of influx of atoms in the two lower levels of the Λ, and an outflux from all the three levels. The steady-state expressions for the atomic density-matrix elements are numerically evaluated to yield the experimentally measured response characteristics. Our predictions are in excellent agreement with the reported experimental results for ⁴He*. The role played by the VCC parameter is seen to be distinct from that by the transit time or Raman coherence decay rate.

Citation Download Citation

R. Ghosh, J. Ghosh, F. Goldfarb, J.-L. Le Gouët, and F. Bretenaker "Realistic theory of electromagnetically induced transparency and slow light in a hot atomic vapor", Proc. SPIE 7226, Advances in Slow and Fast Light II, 72260J (2 February 2009); https://doi.org/10.1117/12.816344

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