Propagation of two short laser pulse trains in a $\Lambda$-type three-level medium under conditions of electromagnetically induced transparency

摘要

We investigate the dynamics of a pair of short laser pulse trains propagatingin a medium consisting of three-level $\Lambda$-type atoms by numericallysolving the Maxwell-Schr\"odinger equations for atoms and fields. By performingpropagation calculations with different parameters, under conditions ofelectromagnetically induced transparency, we compare the propagation dynamicsby a single pair of probe and coupling laser pulses and by probe and couplinglaser pulse trains. We discuss the influence of the coupling pulse area, numberof pulses, and detunings on the probe laser propagation and realization ofelectromagnetically induced transparency conditions, as well on the formationof a dark state.