A series of In:Nd:LiNbO 3 crystals were grown by Czochralski technique and were made into waveguide substrates. The optical damage resistance of the In:Nd:LiNbO 3 waveguide substrates was characterized by measurement of the holographic method. The optical damage resistance of In (3.0mol %):Nd:LiNbO 3 was much higher than that of other In:Nd:LiNbO 3 . The ultraviolet-visible (UV-Vis) absorption spectra the In:Nd:LiNbO 3 crystals were measured and investigated. The structure defects were discussed in this paper to explain the enhance of the optical damage resistance in the In:Nd:LiNbO 3 crystals.
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