Abstract
The evolution of mutual phase shift between the second-harmonic seeding light and the second-harmonic light produced by the photo-induced non-linearity in optical fibre in the course of the fibre preparation process is computed using the data of Lambelet–Feinberg's experiment. It is shown that this mutual phase shift monotonously decreases from its initial value, which depends upon the light intensities of the fundamental pump and second-harmonic seeding radiations, and approaches −π/2 in the saturation state. A simple phenomenological model is proposed that describes the formation of a photo-induced χ(2) grating by means of a complex rate coefficient β, which is dependent upon the light intensities of shaping radiation and varies in the course of the χ(2) writing process. The self-organized parametric down-conversion with strong second-harmonic seeding being above the saturation value is proposed for an effective χ(2) grating formation.
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