Abstract

The conditions for the existence and the main characteristics of weakly damped space-charge waves are investigated for photorefractive ferroelectrics. These conditions are opposite those derived previously for sillenites and may be fulfilled in such crystals as LiNbO₃, BaTiO₃, and SrBaNb₂O₆. The waves exist for sufficiently large values of the applied or photovoltaic field and have a linear dispersion law. The resonance excitation of space-charge waves by a moving light pattern is investigated. Possible manifestations of the instability of the photorefractive grating against parametric excitation of eigenmodes are considered.

© 1995 Optical Society of America

Space-charge waves in photorefractive crystals and their parametric excitation

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