Parametrical down-conversion process on all-optical poling

Investigations of the nonlinear optical phenomenon of light parametrical down-frequency conversion which is appeared on micro-periodic nonlinear structures photo-integrated in volumetric optical isotropic medium on all-optical poling process are presented. The observed phenomenon is similar to the well known degenerate parametric conversion in square-nonlinear media such as the optical nonlinear crystals. Observations of the amplification of low light signals on the created micro-structured oxide glass materials and also the appearance of the photoelectric instability of the preliminarily induced optical anisotropy by illumination of medium with use the coherent monochromatic source are considered. The big growth of the intensity of small signal of the basic frequency radiation with time (a photo-induced amplification of light) has been detected in experiments with the influence upon amorphous optical material simultaneously by the weak probe radiation of the basic frequency and the strong radiation of the second harmonic. Various modes of the amplification of light signal in experimental samples were investigated in presence of the preliminary created photo-integrated nonlinear structures with different amplitudes and mechanisms of the occurrence of the parametric generation in photo-integrated structures with the existence of the non-steady regimes of signal amplification are discussed.