Dynamic microcavities in collision of unipolar rectangular pulses of self-induced transparency in a dense gas medium

In contrast to conventional multi-cycle pulses resonantly exciting quantum transitions in a medium, unipolar light pulses with a non-zero electric area can be used for ultrafast excitation of quantum systems. The interaction of such pulses with a resonant medium can give rise to many interesting effects that have been actively studied in recent years. These include the possibility, recently predicted by the authors, of creating dynamic microresonators that arise when such pulses collide in a medium. In this paper, based on the numerical solution of the Maxwell-Bloch system of equations, we study the dynamics of such resonators in a dense three-level medium during a collision of unipolar rectangular pulses acting like 2$\pi$-pulses of self-induced transparency. In contrast to earlier studies, we consider the case of an “asymmetric” collision, when the pulses enter the medium at different moments of time and collide not in its center. The possibility of forming structures of various shapes in different regions of the medium after each subsequent collision is shown.