Periodic nonlinear waves in degenerate two-photon interaction in a two-level medium

Guram T. Adamashvili

Alexander A. Zabolotskii

The formation of soliton-like structures in a periodic medium containing impurity atoms with resonant two-photon transition degenerate over the magnetic moment projection is studied. For small field amplitudes, the evolution equations are derived and the solutions are obtained, which describe nonlinear polarization effects.

Guram T. Adamashvili

Rui-hua Xie, Gong-ou Xu, Dun-huan Liu

We have studied the squeezing properties of a field and atom in a two-level system. The influence of nonlinear interactions (Le. the arbitrary intensity-dependent coupling of a single-mode field to a single two-level atom, the nonlinear interaction of the field with a nonlinear Kerr-like medium) on the squeezing is discussed in detail in the rotating wave approximation (RWA). We show numerically that the effect of the virtual-photon field suppresses dipole squeezing predicted in the RWA and leads to an increased squeeze revival period; the suppressed squeezing can be revived due to the presence of the nonlinear Kerr-like medium.

V. V. Kabanov

An investigation is reported of the influence of self-phase-modulation of high-power pump waves on the degenerate four-wave mixing of bandwidth-limited pulses in a two-level medium. An analysis is made of the characteristic features of spectral broadening of the signal and phase-conjugate waves on the interacting pulses of different durations. The delay of the nonlinear response of the medium is taken into account. The phase modulations of the signal and phase-conjugate waves induced in this four-wave interaction are not mutually conjugate and have the same sign.

Boris A. Malomed