Nonstationary amplification of holographic gratings in birefringent photorefractive crystals

A theoretical model of nonstationary self-amplification of weak holographic gratings in birefringent photorefractive crystals with two-and one-frequency readout is presented. The model takes account of the multiwave and vector character of the interactions and the simultaneous occurrence of intra-and intermode recording and diffraction processes with different phase detunings and complex coupling constants, which take account of the local and nonlocal response mechanisms of the medium. Analytical solutions are obtained for the intercoupled recording and diffraction equations. The results of numerical calculations of the kinetics of the spatial amplitude-phase profile and gain of the holographic grating and the selective amplification properties with intra-and intermode interaction geometries are presented. Zh. Tekh. Fiz. 67, 68–77 (April 1997)