Abstract
Multi-beam coupling in photorefractive crystals is an attractive method for transferring the energy of several coherent pump beams into a single signal beam. In this process, a spatially periodic intensity pattern is created by interference of the coherent writing beams. This periodicity allows the definition of a two-dimensional elementary cell within the plane of interaction, which is defined by the crystal’s c-axis and the wave vectors of the beams. Using a single-center model, the temporal evolution of the carrier distribution and the electric field in this elementary cell can be computed numerically, thereby overcoming limitations of the one-dimensional approach used for the description of two beam coupling. The amplitudes and phase shifts of the induced index gratings are then obtained by Fast Fourier Transformation of the local variations of the components of the dielectric tensor caused by the electro-optic effect.
© 2003 Optical Society of America
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