The report is focused on

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• The report is focused on
• Coherent interaction between an optically dense
  resonant medium and near-resonant laser light
• Influence of intrinsic light-matter dynamics on
  nonlinear parametric processes
• Role of the dispersion of a strongly coupled
  light-matter system (polaritons)
• Peculiarities of the strong-coupling regime in a
  free-space in contrast to cavity interactions

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Spatial spectrum is NOT fixed by a
cavity (continuos)
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Nonlinear pump-probe interaction
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Propagation of a probe pulse in the presence of a
pump
Coherent density- and coordinate- dependent
features under nonlinear parametric interaction
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Experiments in a Ne discharge (588.2 nm)
Resonant atom density is n1013 cm-3
Transition from strong-coupling to strong-field
regime
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Conclusions
Nonstationary interaction of laser pulses with a
dense resonant medium was considered under the
strong-coupling regime of light-matter
interaction Internal collective light-matter
dynamics was shown to significantly affect
nonlinear parametric interactions between short
laser pulses Efficient parametric processes in
the strong coupling regime were proved even for
the free-space conditions Contrary to stationary
strong-field effects, the density- and
coordinate-dependent transmission spectra of the
probe manifest the importance of collective
oscillations and cannot be obtained in the
framework of a single-atom model
References
S.N. Bagayev, V.S. Egorov, I.B. Mekhov, P.V.
Moroshkin, I.A. Chekhonin, E.M. Davliatchine,
and E. Kindel, Phys. Rev. A 68, 043812
(2003) V.S. Egorov, V.N. Lebedev, I.B. Mekhov,
P.V. Moroshkin, I.A. Chekhonin, and S.N.
Bagayev, Phys. Rev. A 69, 033804 (2004)