dorsal/arxiv
View SchemaCoherent interaction of laser pulses in a resonant optically dense extended medium under the regime of strong field-matter coupling
| Authors | V. S. Egorov, V. N. Lebedev, I. B. Mekhov, P. V. Moroshkin, I. A. Chekhonin, S. N. Bagayev |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0308155 |
| URL | https://arxiv.org/abs/quant-ph/0308155 |
| DOI | 10.1103/PhysRevA.69.033804 |
| Journal | Phys. Rev. A 69, p. 033804 (2004) |
Abstract
Nonstationary 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.
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"abstract": "Nonstationary pump-probe interaction between short laser pulses propagating\nin a resonant optically dense coherent medium is considered. A special\nattention is paid to the case, where the density of two-level particles is high\nenough that a considerable part of the energy of relatively weak external\nlaser-fields can be coherently absorbed and reemitted by the medium. Thus, the\nfield of medium reaction plays a key role in the interaction processes, which\nleads to the collective behavior of an atomic ensemble in the strongly coupled\nlight-matter system. Such behavior results in the fast excitation interchanges\nbetween the field and a medium in the form of the optical ringing, which is\nanalogous to polariton beating in the solid-state optics. This collective\noscillating response, which can be treated as successive beats between light\nwave-packets of different group velocities, is shown to significantly affect\npropagation and amplification of the probe field under its nonlinear\ninteraction with a nearly copropagating pump pulse. Depending on the probe-pump\ntime delay, the probe transmission spectra show the appearance of either\nspecific doublet or coherent dip. The widths of these features are determined\nby the density-dependent field-matter coupling coefficient and increase during\nthe propagation. Besides that, the widths of the coherent features, which\nappear close to the resonance in the broadband probe-spectrum, exceed the\nabsorption-line width, since, under the strong-coupling regime, the frequency\nof the optical ringing exceeds the rate of incoherent relaxation. Contrary to\nthe stationary strong-field effects, the density- and coordinate-dependent\ntransmission spectra of the probe manifest the importance of the collective\noscillations and cannot be obtained in the framework of the single-atom model.",
"arxiv_id": "quant-ph/0308155",
"authors": [
"V. S. Egorov",
"V. N. Lebedev",
"I. B. Mekhov",
"P. V. Moroshkin",
"I. A. Chekhonin",
"S. N. Bagayev"
],
"categories": [
"quant-ph",
"physics.optics"
],
"doi": "10.1103/PhysRevA.69.033804",
"journal_ref": "Phys. Rev. A 69, p. 033804 (2004)",
"title": "Coherent interaction of laser pulses in a resonant optically dense extended medium under the regime of strong field-matter coupling",
"url": "https://arxiv.org/abs/quant-ph/0308155"
},
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