FREQUENCY REDISTRIBUTION FUNCTION OF PHOTONS IN THE THEORY OF THE RESONANCE RADIATION TRANSFER IN THE PRESENCE OF A LASER FIELD

In the framework of the atom-photon density matrix formalism the theory is developed for resonance radiation transfer in the presence of a laser field in the gas of two-level atoms. The explicit expressions for the frequency redistribution function are derived. It is shown that the, presence of a laser field varies significantly both the shape of the frequency redistribution function and its structure. The four-wave coupling taking place in the case concerned is shown to have an essential influence on reabsorption of radiation.