Abstract

The response of photorefractive crystals with bulk photovoltaic charge transport is usually highly nonlinear, and for illumination with a sinusoidal light pattern the recorded space-charge gratings possess, apart from the principal spatial frequency K, several higher spatial harmonics, 2K, 3K, etc. We show experimentally that purely sinusoidal index gratings can be recorded in LiNbO3:Fe when the charge redistribution is governed by spatially oscillating photovoltaic currents. This property is especially beneficial for holographic data storage.

© 2006 Optical Society of America

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