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We report on the results of lasing and spectroscopic investigations of the anomalously slow recoverable bleaching of Cr,Ca:YAG and Cr,Mg:YAG crystals. We propose two models for this effect: (i) Cr4+ reduction to Cr3+ due to oxygen valence band electron capture by Cr4+, and (ii) induced disorder in Cr4+ tetrahedral center due to effect of oxygen vacancies.
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Irina T. Sorokina, S. Naumov, E. Sorokin, A. G. Okhrimchuk, "Mechanisms of slow bleaching in YAG:Cr4+ under cw pumping," Proc. SPIE 4350, Laser Optics 2000: Solid State Lasers, (23 March 2001); https://doi.org/10.1117/12.420950