Parametric amplification of light waves at low-frequency pumping in aperiodic nonlinear photonic crystals

摘要: The process of nondegenerate optical parametric amplification in a low-frequency pump field that includes the traditional at high-frequency pumping and two up-conversion processes is investigated. Such coupled interactions can be simultaneously realized an aperiodic nonlinear photonic crystal (ANPC) i.e., with change sign wave coupling coefficient. ANPCs created by method superposition nonlinearity modulations three functions for each which quasi-phase-matching condition met one involved interaction. In addition to results obtained from direct numerical solution original equations spatially varying coefficients, their containing effective constant coefficients are presented. An approach allows calculation these simplified considerably has been developed. methods have found yield closely coincident characteristics studied here. A LiNbO3 ANPC used as example calculate tuning process, its dynamics, frequency bands amplification, effect random deviation conditions on interaction efficiency.