Superluminal to subluminal transition in the pulse propagation in a resonantly absorbing medium
MAI Talukder, Y Amagishi, M Tomita - Physical Review Letters, 2001 - APS
MAI Talukder, Y Amagishi, M Tomita
Physical Review Letters, 2001•APSWe 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 v S defined within the framework of the saddle-point
method as well as by a recent prediction of the net group delay of surviving frequency.
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 v S defined within the framework of the saddle-point
method as well as by a recent prediction of the net group delay of surviving frequency.
Abstract
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 v S 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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