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Superluminal to Subluminal Transition in the Pulse Propagation in a Resonantly Absorbing Medium

2001; American Physical Society; Volume: 86; Issue: 16 Linguagem: Inglês

10.1103/physrevlett.86.3546

1092-0145

Md. Aminul Islam Talukder, Yoshimitsu Amagishi, Makoto Tomita,

Photoreceptor and optogenetics research

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.