Abstract
The influence of Fe doping on the photorefractive properties of tetragonal potassium tantalate-niobate (KTN) crystals is investigated. Light-induced refractive index changes, decay time constants and gain coefficients are measured as a fucntion of external electric field and spatial frequency for KTN crystals with different Fe concentrations. The observed behaviour is interpreted in terms of a transport model which assumes one kind of photorefractive centers with both electrons and holes as free charge carriers, taking into account space charge limitations due to the available trap density.
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