Influence of Fe doping on the photorefractive properties of KTa1-xNbxO3
- 1 October 1994
- journal article
- research article
- Published by Taylor & Francis in Ferroelectrics
- Vol. 160 (1) , 213-224
- https://doi.org/10.1080/00150199408007710
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.Keywords
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