Abstract
To date highest external diffraction efficiency and two-beam coupling gain at moderate applied fields (about 30% and 260cm−1, respectively, at 60V∕μm) are obtained in photorefractive reflection gratings with grating periods of about 0.2μm using a standard low-glass-temperature polyvinylcarbazole based composite. Reflection gratings exhibit five times faster growth/erasure rates than conventional transmission gratings. Further, their performance is very sensitive to changes in the saturation field. This allows a reliable calculation of the photorefractive trap density, which shows a significant enhancement with the field. Finally, the theoretical analysis reveals the geometry-dependent competition between the birefringence and electro-optic contributions.
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