Phase-matching condition between acoustic and optical waves in doped fibers

A new technique, recently proposed [1] for achieving phase-matching in Bril louin scattering in a dielectric fiber doped by three-level A-type ions, ca n lead to a dramatic increase of efficiency of ponderomotive nonlinear inte raction between electromagnetic waves and holds promise for applications in quantum optics. In this paper, we investigate possibilities to establish p hase-matching condition for acoustic modes in confined geometries that exhi bit nonzero cutoff frequencies. (C) 2001 MAX "Nauka/Interperiodica".