[1] Askin A, Boyd G D, Dziedzic J M, et al. Optically-induced refractive index inhomogeneities in LiNbO3 and Li TaO3. Appl. Phys. Lett., 1966, 9: 72
[2] Zhong Gi-guo, Jin Jian, Wu Zhong-kang. Measurements of Optically Induced Refractive-Index Damage of Lithium Niobate Doped with Different concentration of MgO. In Proceeding of 11th International Quantum Electronic Conference, IEEE, 1980, 80: 631
[3] Wang Hua-Fu, Shi Guo-Tong, Wu Zhong-Kang. Photovoltaic effect in LiNbO3: Mg. Phys. Stat. Sol. (a), 1984, 89: K211
[4] Bryan D A, Gerson R, Tomaschke H E. Increased optical damage resistance in lithium niobate. Appl. Phys. Lett., 1984, 44: 847
[5] Wen Jin-Ke, Wang Liang, Tang Yan-Sheng, et al. Enhanced resistance to photorefractive and photovoltaic effect in Li-rich LiNbO3: Mg crystals. Appl. Phys. Lett., 1988, 53: 260
[6] Furukawa Y, Kitamura K, Takekawa S, et al. Stoichiometric Mg: LiNbO3 as an effective material for nonlinear optics. Opt. Lett., 1998, 23: 1892
[7] Furukawa Y, Kitamura K, Takekawa S, et al. Photorefraction in LiNbO3 as a function of [Li]/[Nb] and MgO concentrations. Appl. Phys. Lett., 2000, 77: 2494
[8] Kong Yong-Fa, Deng Jia-Chun, Zhang Wan-Lin, et al. OH- absorption spectra in doped lithium niobate crystals. Phys. Lett. A, 1994, 196: 128
[9] Schirmer O F, Thiemann O, Wohlecke M. Defects in LiNbO3-Ⅰ. experimental aspects. J. Phys. Chem. Solids, 1991, 52: 185
[10] Iyi N, Kitamura K, Izumi F, et al. Comparative study of defect structures in lithium niobate with different compositions. J. Solid State Chem., 1992, 10: 340
[11] Liu Jian-Jun, Zhang Wan-Lin, Zhang Guang-Yin. Defect chemistry analysis of the defect structure in Mg-doped LiNbO3 crystals. Phys. Stat. Sol. (a), 1996, 156: 285