Photorefractive gratings have been written in Pr:LiNbO3 by use of a diode laser for writing and of filtered white light (390–520nm) as a gating source. The gating light increases the writing efficiency by more than 3 orders of magnitude, and the two-step writing process provides nondestructive readout. The material sensitivity for two-color writing rises strongly for gating wavelengths near the bandgap and approaches that of Fe-doped lithium niobate at power densities of a few watts per square centimeter. In addition, we show that the dynamic range of the recording process is strongly dependent on the writing intensity.
© 1997 Optical Society of America
H. Guenther, G. Wittmann, R. M. Macfarlane, and R. R. Neurgaonkar, "Intensity dependence and white-light gating of two-color photorefractive gratings in LiNbO3," Opt. Lett. 22, 1305-1307 (1997)