Abstract
The characteristics of energy transfer and migration processes important in the optical dynamics of Y 3 Al 2 O 12 :Tm,Ho and Y 3 Al 5 O 12 :Tm laser crystals were investigated. Laser-induced grating spectroscopy was used to study spatial migration of energy among the Tm ions as a function of both temperature and Tm ion concentration. The presence of energy migration was identified in the 3 H 4 level, and this was shown to enhance the cross-relaxation process from this level
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