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Specific features of nonlinear interference processes at quantum transitionsin near- and fully-resonant optically-dense Doppler-broadened medium arestudied. The feasibility of overcoming of the fundamental limitation on avelocity-interval of resonantly coupled molecules imposed by the Doppler effectis shown based on quantum coherence. This increases the efficiency ofnonlinear-optical processes in atomic and molecular gases that possess the mostnarrow and strongest resonances. The possibility of all-optical switching ofthe medium to opaque or, alternatively, to absolutely transparent, or even tostrongly-amplifying states is explored, which is controlled by a smallvariation of two driving radiations. The required intensities of the controlfields are shown to be typical for cw lasers. These effects are associated withfour-wave mixing accompanied by Stokes gain and by their interference in fully-and near-resonant optically-dense far-from-degenerate double-Lambda medium.Optimum conditions for inversionless amplification of short-wavelengthradiation above the oscillation threshold at the expense of thelonger-wavelength control fields, as well as for Raman gain of the generatedidle infrared radiation, are investigated. The outcomes are illustrated withnumerical simulations applied to sodium dimer vapor. Similar schemes can berealized in doped solids and in fiber optics.Comment: 15 pages, 12 figures, 46 reference

Nonlinear interference effects and all-optical switching in optically dense inhomogeneously broadened media