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We investigate the spatio-temporal evolution of a Gaussian probe pulsepropagating through a four-level $N$-type atomic medium. At two-photonresonance of probe-and control fields, weaker probe pulses may propagatethrough the medium with low absorption and pulse shape distortion. In contrast,we find that increasing the probe pulse intensity leads to a splitting of theinitially Gaussian pulse into a sequence of subpulses in the time domain. Thenumber of subpulses arising throughout the propagation can be controlled via asuitable choice of the probe and control field parameters. Employing a simpletheoretical model for the nonlinear pulse propagation, we conclude that thesplitting occurs due to an interplay of Kerr nonlinearity and group velocitydispersion.

Pulse-splitting in light propagation through $N$-type atomic media due to an interplay of Kerr-nonlinearity and group velocity dispersion