Abstract
The ultraviolet-visible and infrared absorption spectra of Fe2O3 and MgO co-doped lithium niobate (LiNbO3) crystals have been investigated. The experimental results show that some Fe2+ ions are still in Li-sites while the doping concentration of MgO is above threshold. Our results show that the large reduction of defect () in nearly stoichiometric LiNbOs is the key factor to reduce the content of for anti-photorefraction. Based on defect chemical analysis, we obtained that only 1.3 mol.% of MgO is needed to suppress the optical damage completely in a nearly stoichiometric LiNbO3 crystal with [Li]/[Nb]=49.9/50.1 while 21.2 mol.% needed in congruent ones.
© 2001 Optical Society of America
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