Abstract
The theory of amplification and lasing without population inversion in a three-level medium with inhomogeneous broadening via the formation of an open V configuration is elaborated. The conditions for energy transfer from the infrared into the visible spectral range, i.e., the conditions of up-conversion nb>nc>na, and the external field required for saturation of the b⇄a transition are established. Two-photon resonant Raman transitions in ensemble of mobile atoms of a gas-discharge plasma are analyzed. The frequency shift of the probe field spectrum as a whole is shown to be governed by the frequency shift of the pump field multiplied by the ratio of the wave numbers of the probe amplification field and the pump field. The interaction of atoms through Ne transitions with the pump field (λ=1.15 em, 2p4-2s2 transition) and the lasing field (λ=0.6328 em, 3s2-2p2 transition) with an increase in the lasing frequency by a factor of 1.82 with respect to the absorbed radiation is calculated.
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