Abstract
crystals at continuous-wave illumination are reported. The investigation clearly indicates an increase in the photorefraction amplitude Δns (at saturation) with light intensity J for all crystals studied. The main result is a correlation between ∂(Δns)/∂J and the density N of intrinsic defects such as NbLi. This effect is independent of the accidental iron contamination. Therefore at low J, Δns decreases with an increase in N, whereas at high J the opposite dependence is observed. The threshold intensity value of such a transformation correlates with the optical quality of the crystal. It has been established that these photorefraction changes are connected with the light induced absorption of the secondary centers, caused by the existence of the metastable small polarons at room temperature during illumination.
Similar content being viewed by others
Author information
Authors and Affiliations
Additional information
Received: 7 January 1997/Revised version: 7 February 1997
Rights and permissions
About this article
Cite this article
Kostritskii, S., Sevostyanov, O. Influence of intrinsic defects on light-induced changes in the refractive index of lithium niobate crystals . Appl Phys B 65, 527–533 (1997). https://doi.org/10.1007/s003400050308
Published:
Issue Date:
DOI: https://doi.org/10.1007/s003400050308