Processes of interaction of excited ions are investigated in several laser crystals: Er-Er -- in YSGG:Cr, Er and GSAG:Cr,Er crystals; Ho-Ho -- in YSGG:Cr, Ho crystals; Tm-Tm -- in YSGG:Cr,Tm and YAG:Cr,Tm crystals; Tm-Ho -- in YSGG:Cr, Tm, Ho and YSAG:Cr, Tm, Ho crystals; Cr-Cr -- in 11 of different laser crystals (ruby, YAG, GSGG, YSGG, LICAF, et al.); Cr-TR (Er, Ho, Tb, Tm, Nd, -- TR) in YAG, YSGG, GSGG, GSAG crystals.
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