We report experimental and theoretical studies of nonvolatile photorefractive holographic recording in LiNbO<sub>3</sub>:Cu:Ce crystals with two illumination schemes: (1) UV light for sensitization and a red interfering pattern for recording and (2) blue light for sensitization and a red pattern for recording. The results show that the oxidized LiNbO<sub>3</sub>:Cu:Ce crystals can provide high, persistent refractive-index modulation with weak light-induced scattering. The optimal working conditions and the prescription for doping and oxidation—reduction processing that yields the maximum refractive-index modulation are discussed.
© 2000 Optical Society of America
Youwen Liu, Liren Liu, Changhe Zhou, and Liangying Xu, "Nonvolatile photorefractive holograms in LiNbO3:CuCe crystals," Opt. Lett. 25, 908-910 (2000)