Abstract: We investigate the boundary-value problem of nonresonant reflection and transmission of probe light wave passing through excited nonlinear semi-infinite medium of three- level atoms. The two lower levels are excited by intensive resonant stationary or nonstationary radiation to obtain the interference of atomic states. Some properties of near field effect in this problem are investigated taking into account retarded polarizing fields and the density-dependent near dipole-dipole interactions. We separate in our consideration three waves: the inversion wave and two polarization waves with corresponding nonlinear indices of refraction.!0
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