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Photorefractive gratings generated by band-gap excitation: Application to KNbO3 |
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| Authors: | M. Carrascosa F. Agulló-López G. Montemezzani P. Günter |
| Affiliation: | Departamento de Física de Materiales, Universidad Autónoma de Madrid, 28049 Madrid, Spain, ES Nonlinear Optics Laboratory, Institute of Quantum Electronics, Swiss Federal Institute of Technology, ETH H?nggerberg, 8093 Zürich, Switzerland (Fax:+41-1/633-1056, E-Mail: germano@iqe.phys.ethz.ch), CH |
| Abstract: | A simple model was developed to account for the generation of thin space–charge gratings induced by band-gap illumination in photorefractive crystals. It includes the high-intensity regime where the contribution of free carriers to the space–charge field cannot be neglected. The model was specifically applied to explain the occurrence of two mutually π-phase-shifted gratings below the surface of KNbO3 as well as diffraction features that have been previously observed experimentally. Received: 11 October 2000 / Revised version: 22 January 2001 / Published online: 20 April 2001 |
| Keywords: | PACS: 42.65 42.70 42.40 |
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