Abstract
Holograms may be recorded in photorefractive LiNbO3:Cu with pulsed infrared light (wavelength λ=1064 nm, Q-switched Nd:YAG laser), if the crystals are previously or simultaneously illuminated with a green (λ=532 nm) light pulse. We study refractive index changes and time constants of as-grown and thermally treated crystals with different copper concentrations. A model explaining this effect is discussed.
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