Coherent interaction of laser pulses in a resonant optically dense extended medium under the regime of strong field-matter coupling

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dc.creatorEgorov, V. S.
dc.creatorLebedev, V. N.
dc.creatorMekhov, I. B.
dc.creatorMoroshkin, P. V.
dc.creatorChekhonin, I. A.
dc.creatorBagayev, S. N.
dc.date2003-08-28
dc.date2003-12-21
dc.date.accessioned2026-07-07T06:07:41Z
dc.date.available2026-07-07T06:07:41Z
dc.descriptionNonstationary pump-probe interaction between short laser pulses propagating in a resonant optically dense coherent medium is considered. A special attention is paid to the case, where the density of two-level particles is high enough that a considerable part of the energy of relatively weak external laser-fields can be coherently absorbed and reemitted by the medium. Thus, the field of medium reaction plays a key role in the interaction processes, which leads to the collective behavior of an atomic ensemble in the strongly coupled light-matter system. Such behavior results in the fast excitation interchanges between the field and a medium in the form of the optical ringing, which is analogous to polariton beating in the solid-state optics. This collective oscillating response, which can be treated as successive beats between light wave-packets of different group velocities, is shown to significantly affect propagation and amplification of the probe field under its nonlinear interaction with a nearly copropagating pump pulse. Depending on the probe-pump time delay, the probe transmission spectra show the appearance of either specific doublet or coherent dip. The widths of these features are determined by the density-dependent field-matter coupling coefficient and increase during the propagation. Besides that, the widths of the coherent features, which appear close to the resonance in the broadband probe-spectrum, exceed the absorption-line width, since, under the strong-coupling regime, the frequency of the optical ringing exceeds the rate of incoherent relaxation. Contrary to the stationary strong-field effects, the density- and coordinate-dependent transmission spectra of the probe manifest the importance of the collective oscillations and cannot be obtained in the framework of the single-atom model.
dc.description10 pages, 8 figures, to be published in Phys. Rev. A
dc.identifierhttps://arxiv.org/abs/quant-ph/0308155
dc.identifierhttp://arxiv.org/abs/quant-ph/0308155
dc.identifierPhys. Rev. A 69, p. 033804 (2004)
dc.identifierdoi:10.1103/PhysRevA.69.033804
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/91377
dc.subjectQuantum Physics
dc.subjectOptics
dc.titleCoherent interaction of laser pulses in a resonant optically dense extended medium under the regime of strong field-matter coupling
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