Photorefractive gratings generated by band-gap excitation: Application to KNbO3
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.
- Publication:
-
Applied Physics B: Lasers and Optics
- Pub Date:
- May 2001
- DOI:
- 10.1007/s003400100545
- Bibcode:
- 2001ApPhB..72..697C
- Keywords:
-
- PACS: 42.65;
- 42.70;
- 42.40;
- PACS: 42.65; 42.70; 42.40