Two-Wave Coupling on Dynamic Reflection Holograms in Cubic Photorefractive Crystals upon Signal-Beam Phase Modulation

摘要

Reflection holograms written in photorefractive crystals of Bi 12 SiO 20 and Bi 12 TiO 20 sillenites by virtue of the diffusion-driven redistribution of charge carriers over donor and trapping defect sites have a high diffraction efficiency in the absence of external electric fields [1, 2]. The dynamic character of reflection holograms formed in photorefractive crystals allows for their use for the adaptive treatment of nonstationary light field patterns in optical sensors [3, 4]. In this communication, we report the results of study of the coupling of a reference light beam with a phase-modulated signal beam on the reflection holograms formed by these beams, in the presence of local and nonlocal components of the photorefractive response, in a cubic gyrotropic photorefractive crystal in the absence of an applied electric field.