Abstract
ABSTRACT In:Tm:LiNbO 3 crystals were grown by the Czochralski technique with fixed concentrations of Tm 2 O 3 and differing concentrations of In 2 O 3 . Their ultraviolet-visible absorption spectra were measured in order to investigate their defect structures and their optical damage resistance was characterized by the transmission light spot distortion method. The results show that the optical dama ge resistance of the In:Tm:LiNbO 3 crystals improves with the doping concentration of In 2 O 3 increasing. The dependence of the optical damage resistance on the defect structure of In:Tm:LiNbO 3 crystals is discussed in detail. Keywords: In:Tm:LiNbO 3 , defect structure, optical damage resistance 1. INTRODUCTION LiNbO 3 , a technological material with advant ageous electrooptic, acoustooptic and nonlinear optical characteristics, has been studied intensively 13 . Doped with Rare-earth ions, LiNbO 3 crystals offer technologically important possibilities for planar waveguide lasers and actually have been utilized in many various technological applications
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