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Summary form only given, as follows. One of the leading directions of nonlinear laser spectroscopy is a study of interaction of radiation with material. The purpose of the work is to research effects of amplification of radiation without creation of initial inversion of population levels in three-level atomic media. Calculation of generation parameters in three-level systems on the main transition will allow to get a generation at frequencies where creating the usual lasers is difficult (ultraviolet and X-ray area).