Abstract
Holographic gratings are recorded in LiNbO 3:Fe using frequency-doubled pulses of a Q-switched Nd:YAG laser (light wavelength λ = 532 nm, pulse duration t p = 20 ns). We monitor diffraction efficiencies of the holograms during and several milliseconds after exposure. Variations of Fe 2+ concentration, light intensity, and fringe spacing show that different types of gratings are involved: amplitude, thermo-optic, pyroelectric, and space-charge gratings. The influence of the internal pyroelectric field on the light-induced charge transport is discussed in terms of a two-center model. Pyroelectric and bulk photovoltaic effect partially compensate each other. In LiNbO 3:Fe the photovoltaic effect is the dominant charge driving force for our recording conditions.
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