title: Influence of composition on the photorefractive centers in pure LiNbO3 at low light intensity.
abstract: The influence of composition on the photorefractive effect in pure LiNbO3 crystals at low light intensity was investigated. The experimental results indicate that different defects dominate the photorefractive centers of pure LiNbO3 with various compositions. Bipolarons are considered to be responsible for the enhanced photovoltaic field in reduced near-stoichiometric LiNbO3, and their bulk photovoltaic constant kappa is estimated to be approximately 6.95 x 10(-32) m3/V. Q polarons (composed of two bipolarons) are introduced to explain the photorefractive effect of congruent LiNbO3 at both low and high light intensities.
authors.affiliation: Key Laboratory of Advanced Technique and Fabrication for Weak-Light Nonlinear Photonics Materials, Ministry of Education, Nankai University, Tianjin, China.
authors.forename: Wenbo
authors.initials: W
authors.lastname: Yan
authors.forename: Yongfa
authors.initials: Y
authors.lastname: Kong
authors.forename: Lihong
authors.initials: L
authors.lastname: Shi
authors.forename: Lei
authors.initials: L
authors.lastname: Sun
authors.forename: Hongde
authors.initials: H
authors.lastname: Liu
authors.forename: Xiaochun
authors.initials: X
authors.lastname: Li
authors.forename: Di
authors.initials: D
authors.lastname: Zhao
authors.forename: Jingjun
authors.initials: J
authors.lastname: Xu
authors.forename: Shaolin
authors.initials: S
authors.lastname: Chen
authors.forename: Ling
authors.initials: L
authors.lastname: Zhang
authors.forename: Ziheng
authors.initials: Z
authors.lastname: Huang
authors.forename: Shiguo
authors.initials: S
authors.lastname: Liu
authors.forename: Guangyin
authors.initials: G
authors.lastname: Zhang