The theory of photorefractive resonance

A theory is proposed to describe holograms in thin photorefractive crystals and the self-diffraction of two writing laser beams, one of which is periodically modulated in phase. In linear approximation with respect to the amplitude of the phase modulation, expressions are derived for the AC component of the intensity of various diffraction orders. Oscillations in the intensity are observed having a well-defined resonance character connected with excitation of photorefraction waves, and the frequency position of the resonance peaks is related to the period of the grating by the dispersion law of these oscillations. The results obtained are in good agreement with available experimental data. Fiz. Tverd. Tela (St. Petersburg) 40, 1450–1459 (August 1998)