The paper presents a theoretical investigation of propagation of two frequency laser radiation in resonant $Lambda@-medium driven by a radiofrequency field on the transition between the two bottom levels. It is established that there is dramatic dependence of the character of propagation of radiation along the medium on phase and amplitude of the radiofield and on initial phases and intensities of the optical fields. We show that both amplification of one wave at the expense of the energy of another wave and transparency of the medium produced by population trapping can take place.
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