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Processes of phase hologram recording in binary photopolymeric media have been considered. These media are based on two monomers having different polymerization rates and forming polymers with different refractive indexes. The mechanism of inhomogeneous structures formation in such media includes two main processes: radical polymerization and diffusion mass transfer. The general equations system has been theoretically investigated, which describes the dynamics of inhomogeneous photopolymerization in complex polymeric compositions.

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Illumination of thin z-cut plates of LiNbO, crystals by an active radiation beam (A = 0.44 p,m) of weak power (PL = 10-20 mW) can induce appearance of a microdomain array (No = 106 cm-'). The microdomains have the shape of needles directed along z-axis with average length of 1000-2000 pm and diameter -1 Fm. The special type of conical scattering has been observed. Its peculiarities differ from those of photorefractive light scattering with cone of synchronism. The effect of unlocality of photoinduced domain forming that concerned to the spatial distribution of laser beam has been found. The correlation between the structure rebuilding process and the charge transfer at ferroelectric crystal surface has been established.