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In this paper the measurement result of transmission spectrum of Tb,Tm∶YVO 4 is presented. The intensity Ω t, the probabilities of radiating transition, non-radiating transition, the cross-relaxation and the lifetimes of Tm 3+ ions at 3H 4 and 3F 4 levels are calculated. The results show that when the concentration of Tm 3+ ions >1.2 at.-%, the fluorescent lifetime of upper level 3H 4 is shorter than that of lower level 3F 4 due to the interaction between Tm 3+ and Tb 3+ ions, thus the lasing self-termination at ～1.5 μm can be eliminated.
The intensity Ω t, the probabilities of radiating transition, non-radiating transition, the cross-relaxation and the lifetimes of Tm 3 + ions at 3 H 4 and 3F 4 levels are calculated. The results show that when the concentration of Tm 3+ ions> 1.2 at .-%, the fluorescent lifetime of upper level 3H 4 is shorter than that of lower level 3F 4 due to the interaction between Tm 3 + and Tb 3+ ions, thus the lasing self-termination at ~ 1.5 μm can be eliminated.