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Proceedings Paper

Realistic theory of electromagnetically induced transparency and slow light in a hot atomic vapor
Author(s): R. Ghosh; J. Ghosh; F. Goldfarb; J.-L. Le Gouët; F. Bretenaker
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Paper 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.

Paper Details

Date Published: 2 February 2009
PDF: 15 pages
Proc. SPIE 7226, Advances in Slow and Fast Light II, 72260J (2 February 2009); doi: 10.1117/12.816344
Show Author Affiliations
R. Ghosh, Jawaharlal Nehru Univ. (India)
J. Ghosh, Jawaharlal Nehru Univ. (India)
F. Goldfarb, Lab. Aimé Cotton, CNRS, Univ. Paris Sud 11 (France)
J.-L. Le Gouët, Lab. Aimé Cotton, CNRS, Univ. Paris Sud 11 (France)
F. Bretenaker, Lab. Aimé Cotton, CNRS, Univ. Paris Sud 11 (France)

Published in SPIE Proceedings Vol. 7226:
Advances in Slow and Fast Light II
Selim M. Shahriar; Philip R. Hemmer; John R. Lowell, Editor(s)

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