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

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T. Kohmoto,¹ Y. Fukui,² S. Furue,² K. Nakayama,² and Y. Fukuda¹
¹Department of Physics, Faculty of Science, Kobe University, Kobe 657-8501, Japan
²Graduate School of Science and Technology, Kobe University, Kobe 657-8501, Japan

Received 19 August 2006; published 3 November 2006

Propagationof femtosecond light pulses in a resonant absorption medium isstudied. The propagation time of the light pulses was measuredin a dye solution by the optical-Kerr-gate method. Nonadherence tothe conventional group velocity d omega /dk, which is defined in weakabsorption region, was found. The observed wavelength dependences of thegroup delay and the spectral change in the anomalous dispersionregion are qualitatively in good agreement with the theoretical predictionobtained from the new definitions of group velocity, which canbe clearly defined even in strong absorption region.

URL:	http://link.aps.org/doi/10.1103/PhysRevE.74.056603
DOI:	10.1103/PhysRevE.74.056603
PACS:	42.25.Bs; 78.47.+p 42.25.Bs Optical wave propagation, transmission and absorption 78.47.+p Time-resolved optical spectroscopies and other ultrafast optical measurements in condensed matter YEAR: 2006
KEYWORDS:	dyes, high-speed optical techniques, optical Kerr effect

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