[2] [2] Zhong Giguo,Jin Jian,Wu Zhongkang.11th International Quantum ElectronicsConference, IEEE, Cat. No.80 CH1561-6 (New York, June, 1980), P.631

[3] [3] Sweeney K L,Halliburton L E,Bryan D A.Point defects in mg-doped lithium niobate.JAppl Phys, 1985, 57(4):1036～1038

[4] [4] Kovacs L,Polgar K,Capellett R,et al.IR absorption study of OH- in pure and mg-dopedLiNbO3 crystals.Cryst Def and Amorph Mat,1987,15(3):115～120

[5] [5] Kovacs L,Szaller Zs,Cravero Iet al.OH-related Defects in LiNbO3 Mg, M(M=Nd, Cr, Ti,Mn) Crystals.J Phys Chem Solids,1990, 51(8):417～421