In LiNbO<sub>3</sub> at light intensities above 10<sup>6</sup> W/m<sup>2</sup> much stronger refractive index changes can be induced, as expected from measurements at low intensities. Most experimental data have been published on iron-doped LiNbO<sub>3</sub> crystals. We propose a two-center charge-transport model for LiNbO3:Fe that describes most results at low and high intensities quantitatively. It explains the intensity dependence of steady-state refractive index changes and enhanced holographic sensitivities at high light intensities as well as the presence of light-induced absorption changes.
© 1993 Optical Society of America
F. Jermann and J. Otten, "Light-induced charge transport in LiNbO3:Fe at high light intensities," J. Opt. Soc. Am. B 10, 2085-2092 (1993)