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Propagation of ultrashort optical pulses in a dense resonant medium isconsidered in the semiclassical limit. In our analysis, we place emphasis onseveral main points. First, we study transformations of spectra in the processof pulse propagation and interactions with another pulse. The second pointinvolves the transient processes (including pulse compression) connected withself-induced transparency soliton formation inside the medium. Finally, thethird aspect is the study of collisions of co- and counter-propagating pulsesin the medium. In the last case, the investigation of symmetric and asymmetriccollisions shows the possibility of effectively controlling the parameters oftransmitted radiation.

Femtosecond pulses in a dense two-level medium: Spectral transformations, transient processes, and collisional dynamics