Abstract
We consider a nondegenerate parametric process ω3 → ω1 + ω2 and simultaneous sum frequency generation ω1 + ω3 → ω4 and ω2 + ω3 → ω5 in periodically poled quadratic crystals. An algorithm is proposed for the numerical description of the system evolution with full allowance for the quantum-mechanical interaction of all five plane monochromatic modes and pump depletion. The behaviour of the average number of photons of interacting modes and their mutual correlations is studied. An effect of inversion of the mutual correlation of the modes of the generated light is found.
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