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Nonlinear absorption and density-dependent dephasing in Rydberg electromagnetically-induced-transparency media

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons37683

Gärttner,  Martin
Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society,;
Institut für Theoretische Physik, Ruprecht-Karls-Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg, Germany;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30455

Evers,  Jörg
Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;

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Citation

Gärttner, M., & Evers, J. (2013). Nonlinear absorption and density-dependent dephasing in Rydberg electromagnetically-induced-transparency media. Physical Review A, 88(3): 033417. doi:10.1103/PhysRevA.88.033417.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0014-5DF0-A
Abstract
Light propagation through an ensemble of ultracold Rydberg atoms in an electromagnetically-induced-transparency (EIT) configuration is studied. In strongly interacting Rydberg EIT media, nonlinear optical effects lead to a nontrivial dependence of the degree of probe-beam attenuation on the medium density and on its initial intensity. We develop a Monte Carlo rate equation model that self-consistently includes the effect of the probe-beam attenuation to investigate the steady state of the Rydberg medium driven by two laser fields. We compare our results to recent experimental data and to results of other state-of-the-art models for light propagation in Rydberg EIT media. We find that for low probe field intensities, our results match the experimental data best if a density-dependent dephasing rate is included in the model. At higher probe intensities, our model deviates from other theoretical approaches, because it predicts a spectral asymmetry together with line broadening. These are likely due to off-resonant excitation channels, which, however, have not been observed in recent experiments. Atomic motion and coupling to additional Rydberg levels are discussed as possible origins for these deviations.