"BF00420690" . . . "1993" . . "Two-level model of recording and reading of holographic gratings in photorefractive crystals: nonstationary case"@en . . . . . . . . . "Abstract. A two-level model of recording and readout of holographic gratings in photorefractive crystals proposed by Rustamov has been developed for the nonstationary case. Based on the joint solution of kinetic equations and Maxwell's equations in the quasistationary approximation, a system of coupled partial differential equations for slowly varying optical wave amplitudes has been obtained. The use of a truncated power series expansion has allowed an expression to be obtained for diffraction efficiency in the nonstationary case. The dynamics of diffraction efficiency development is in satisfactory agreement with the available experimental data."@en .