Karpov G. The theoretical model of hologram formation in media with polymerization-diffusion recording mechanism

The theoretical model of hologram formation in media with polymerization-diffusion recording mechanism (photopolymers) has been developed and investigated. The model is based on the consideration of the two interconnected processes: photopolymerization and diffusion mass transfer. The polymerization process was described with chemical kinetics equations. Non-equilibrium distribution of macroradicals, finiteness of its life time and polymer concentration dependence of the reactions coefficients were accounted. The mass transfer process was described on the base of generalized diffusion equation. The conception of the diffusion redistribution of the "free volume" was developed. This approach was used for explicit accounting of the polymer shrinkage. The principal influence of the diffusion/polymerization rates ratio on the hologram properties has been shown. The quantitative criterion of reaching of the maximum recording efficiency was offered. The relation between physical and chemical properties of the components and photopolymer holographic characteristics was determined. Theoretically described and analyzed the effect of the hologram post-exposure selfamlification. The effect of the inversion of the grating phase was predicted. The conditions of the experimental observation of this effect were computed.