Coherent interaction between phase-modulated light pulses and an active medium of two-level particles with inhomogeneous broadening

Abstract

It is shown that induced transitions of an ensemble of two-level articles with an inhomogeneously broadened line in the field of a phase-modulated pulse are analogous to Landau-Zener inelastic transitions in molecules when their terms cross. Even for T% T:, where T and T: are, respectively, the pulse width and the inhomogeneous relaxation time of the medium, a transition of particles of the entire spectrum ( T:) - ' from an upper to a lower level is possible, signifying the complete removal by the pulse of the energy stored in the active medium. Analysis of the dynamics of a phase-modulated pulse by means of the Maxwell-Bloch equations shows, in addition, the possibility of amplifying it without the development of field-amplitude oscillations.