Abstract
Mg:In:Fe:LiNbO 3 crystals were grown using the Czochralski technique by doping LiNbO 3 with MgO, In 2O 3 and Fe 2O 3. Infrared absorption spectra of the crystals were measured and the mechanisms underlying the OH − absorption peak shift to shorter wavelengths were studied. The photo-refractive threshold of Mg:In:Fe:LiNbO 3 crystals was measured by direct observation of the transmission facula distortion. The photo-refractive properties of Mg:In:Fe:LiNbO 3 crystal were initially studied for the case when the concentration of co-doping with Mg 2+ and In 3+ ions was below their threshold level. It was found that the photo-damage threshold of Mg(3 mol%):In(2 mol%):Fe(0.06 wt%):LiNbO 3 crystals was two orders of magnitude higher than that of Fe:LiNbO 3.
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