Two-photon photorefractivity in pure and doped LiNbO 3

Abstract
Measurements at 5 wavelengths between 0.53 and 0.725 μm, and at moderate power levels in the 1–10 MW/cm2 range, indicate that two-photon photorefractive sensitivity in 0.1% iron-doped LiNbO3 is considerably greater than that in undoped crystals.