Journal
PHYSICAL REVIEW LETTERS
Volume 86, Issue 16, Pages 3546-3549Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.86.3546
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We have examined the propagation of femtosecond laser pulses in an absorbing dye solution through a short to a long range of propagation distance. The transmitted pulses show strong spectral shift and a superluminal to subluminal transition in the propagation velocity keeping its initial shape almost intact. It is verified that the peak velocity is well described by a modified group velocity vs defined within the framework of the saddle-point method as well as by a recent prediction of the net group delay of surviving frequency.
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