Abstract
The optical stability of the R-lines and broad band associated with the Cr3+ ions has been studied in codoped congruent and near stoichiometric LiNbO3:Cr:Mg crystals. It has been found that the 2E→4A2 transition of the Cr3+ ions located in Nb5+ sites, [Cr]Nb, can be bleached under optical excitation of the high energy broad absorption band luminescence whereas the emission from the same transition but ascribed to Cr3+ ions located in Li+ sites, [Cr]Li, is optically stable. At variance, the broad emission associated with the 4T2→4A2 vibronic transition ascribed to these centres is optically stable.The recovery temperature for the optical bleaching has been found to be 150K, and has been correlated to Nb4+ electron traps located in Nb5+ antisite position.The different optical stability found for the R-lines and broad band emission associated with the [Cr]Nb sites confirm the existence of two [Cr]Nb centres with low and high crystal field, respectively.
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