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Phys Rev E Stat Nonlin Soft Matter Phys. 2006 Nov;74(5 Pt 2):056603. Epub 2006 Nov 3.

Propagation of femtosecond light pulses in a dye solution: nonadherence to the conventional group velocity.

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  • 1Department of Physics, Faculty of Science, Kobe University, Kobe 657-8501, Japan.


Propagation of femtosecond light pulses in a resonant absorption medium is studied. The propagation time of the light pulses was measured in a dye solution by the optical-Kerr-gate method. Nonadherence to the conventional group velocity domega/dk , which is defined in weak absorption region, was found. The observed wavelength dependences of the group delay and the spectral change in the anomalous dispersion region are qualitatively in good agreement with the theoretical prediction obtained from the new definitions of group velocity, which can be clearly defined even in strong absorption region.

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