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Interband photorefractive effects in KNbO3 induced by ultraviolet illumination

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Abstract

A novel mechanism is used to record photorefractive gratings in dielectric crystals. The photon energy of near-ultraviolet recording beams is larger than the energy gap, and the absorbed photons excite electrons from the valence to the conduction band. These interband photorefractive gratings in undoped KNbO3 show a faster response than gratings recorded in the same material with visible light, i.e., below band-gap excitation. We measured a response time τ = 5 μs for an intensity I = 1 W/cm2 and a refractive-index change of 2 × 10−6. In a transversal readout geometry, large diffraction efficiencies of 60% in 7.5-mm-long crystals are demonstrated. Interband photorefractive gratings are only weakly affected by visible light.

© 1993 Optical Society of America

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