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Physical Review Letters

Pulse Propagation in an Absorbing Medium

Alvin Katz, R. R. Alfano

Published Oct 25, 1982• 33 citations
Publisher
DOI
10.1103/physrevlett.49.1292

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The propagation of a pair of electromagnetic pulses through a coherently prepared atomic medium in the \ensuremath{\Lambda} configuration is studied. We find that even in an absorbing medium, it is possible to produce pulses that propagate shape invariant. The results reveal the spatiotemporal dynamics associated with field propagation, and highlight the role of atom preparation, pulse intensities, and medium length, on the final output pulses that one obtains. We also explore the prospects for pulse shaping and control by using dissimilar shaped pulses at the input to the medium and following their evolution. \textcopyright{} 1996 The American Physical Society.
Self-formation of one or several soliton-like pulses from a nonsoliton powerful laser pulse during its propagation through a two-component resonant amplifying—absorbing medium with an energy dissipation channel is studied numerically. Both components of the medium are simulated by two-level particles. Homogeneous mixtures of these components and media with consecutive amplifying and absorbing layers are considered. A qualitative analysis of the results is based on a simplified model of the process of soliton-like pulse propagation.