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Abstract
Mg : Mn : Fe : LiNbO3 crystals were prepared with fixed concentrations of Fe2O3 and MnCO3, and differing concentrations of MgO. Their ultraviolet–visible absorption spectra were measured in order to investigate their defect structures and their optical damage resistance was characterized by the transmitted beam pattern distortion method. The optical damage resistance of Mg : Mn : Fe : LiNbO3 crystals increases remarkably when the concentration of MgO exceeds a threshold concentration. The photoinduced birefringence change was measured by the Sénarmont method. It decreased with increasing MgO concentration. The dependence of the optical damage resistance on the defect structure of Mg : Mn : Fe : LiNbO3 crystals is discussed.
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