A perturbed F center associated with rare earth ion was identified in YAG:Yb boules with absorption bands at 370 and 625 nm. The dislocation density in the crystal is determined to be less than From the absorption and emission spectras of YAG:Yb the trails of and were detected. Hydroxyl groups were also found in the YAG:Yb crystals. To ensure high laser efficiency of diode pumped YAG:Yb system, the practical doping concentration of must not exceed 20 atm%.
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