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5 September 2002 Threshold of Tm3+, Tb3+:LiYF4 laser at approximately 1.5-μm wavelength
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The analytical formulas of laser threshold of the quasi-four-energy-level system for Tm3+,Tb3+:LiYF4 are deduced from rate-equation of transition. The energy transfer between Tm3 and Tb3 is discussed. The optimal concentration of Tm3+ and Tb3+ and the optimal length of the crystal rod for the minimum threshold pump intensity are calculated. It shows that when Tm3+-ion-doped concentration is comparatively high the threshold of the~1.5?m laser corresponding to 3H4 ?3F4 transition of Tm3+ increases because of the cross-relaxation. When co-doped with Tb3+ ion, on one hand, the threshold tends to decreases by contribution of Tm-Tb energy transfer which effectively reducing the population on the terminal laser level, on the other hand, it results in an increase in threshold due to Tm-Tb energy transfer which also reduces the lifetime of the initial laser level. In this paper the theoretical analysis for optimal Tb3+ concentration is fumished. Calculation shows that for LiYF4 crystal with the Tm3+ concentration being 1atm% the optimal concentration of Tb3+ is 0.2atm%. In addition, the dependence of optimal length of the crystal rod on the concentration of Tm3+ and Tb3+ and distributed rod loss were analyzed.
© (2002) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Xiao Hu, Dawei Fang, Zhi Hong, Fangyu Hong, and Liang-neng Wu "Threshold of Tm3+, Tb3+:LiYF4 laser at approximately 1.5-μm wavelength", Proc. SPIE 4914, High-Power Lasers and Applications II, (5 September 2002);


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