We investigated the temporal evolution of light-induced scattering in LiNbO3:Fe,In crystals with different doping concentrations. A special behavior of the beam fanning was found when the intensity of the incident light was relatively weak. In this case the beam fanning became stronger at the beginning of the illumination and then was greatly reduced, which was observed only at strong incident light intensities. This phenomenon was analyzed on the basis of the saturation space-charge field. The intensity threshold effect and the concentration threshold effect were successfully explained.
© 2001 Optical Society of America
Original Manuscript: August 10, 2000
Revised Manuscript: October 24, 2000
Published: February 10, 2001
Xinzheng Zhang, Jingjun Xu, Simin Liu, Hui Huang, Johann Wolfsberger, Xiaohu Chen, and Guangyin Zhang, "Temporal evolution of beam fanning in LiNbO3:Fe,In crystals," Appl. Opt. 40, 683-686 (2001)