The contribution presents results of the experimental investigation of the photorefractive effect in LiNbO₃ crystals obtained from light diffraction observed on photorefractive records of periodic optical field and obtained from interference images of refractive index modulation in the records. These results are compared with results following from equations describing the process of the photorefractive record formation in cases when various mechanisms of generation of the internal electric current responsible for photorefractive effect are taken into account. The comparison between the calculated and measured dependences shows that the modulation of the refractive index is not caused by the electro-optical effect (as the standard model assumes) but by the redistribution of carriers trapped at the donor centres and by change of their polarisability.

Date Published: 12 April 2007
PDF: 12 pages
Proc. SPIE 6609, 15th Czech-Polish-Slovak Conference on Wave and Quantum Aspects of Contemporary Optics, 660906 (12 April 2007); doi: 10.1117/12.739369

Published in SPIE Proceedings Vol. 6609:
15th Czech-Polish-Slovak Conference on Wave and Quantum Aspects of Contemporary Optics
Miroslav Miler; Dagmar Senderáková; Miroslav Hrabovský, Editor(s)