Parametric generation in the field of a multimode pumping wave is investigated numerically and analytically, in the case when diffractional effects are significant. The dependence of the efficiency of energy transformation and the degree of coherence of the wave generated on the number of spatial inhomogeneities of the pumping beam is analyzed. It is shown that, in conditions of strong energy transfer, conditions of self-channeling of the individual inhomogeneities set in, and the efficiency of the process at the length of diffractional reduction of the phases is practically independent of the initial mode composition of the pumping wave.
Department of General Physics for the Physics Faculty, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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