Abstract
Self-induced transparency (SIT) pulses induce a traveling population
inversion in two-level atoms. As a rule, the active medium in which
the soliton travels has to be homogeneous. Here, we study the effect
of a spatially disordered modulation in the refractive index profile
that may lead to Anderson localizations. The interplay between the
ultrashort SIT pulse, a nonlinear effect, and this kind of disorder-induced
mode exhibits intriguing features. Once the SIT pulse is confined
in the spatially confined regions, they act as closed cavities for
the SIT population inversion. A positive optical feedback mechanism
can be thus activated and, as a result, a two-level laserlike emission
can be obtained.
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