Abnormal velocity of soliton-type pulses in a nonlinear three-level medium with population inversion
I. E. Mazets, Boris G. Matisov
We present an analytical solution of the Maxwell-Schr\"odinger set of equations describing propagation of a two-component short electromagnetic pulse through a medium consisting of atoms with a @sV-type level scheme with an initially inverted population. This solution demonstrates solitonlike waves traveling at a velocity exceeding the vacuum speed of light c (or even a negative velocity) until they reach the forward (or, respectively, trailing) pulse front. The front propagation velocity recognized as information transmission velocity is explicitly found to be equal to c.
Physical Review A•Dec 1, 1995•6 citations