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Proceedings Paper

Threshold of Tm3+, Tb3+:LiYF4 laser at approximately 1.5-um wavelength
Author(s): Xiao Hu; Dawei Fang; Zhi Hong; Fangyu Hong; Liang-neng Wu
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Paper Abstract

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.

Paper Details

Date Published: 5 September 2002
PDF: 10 pages
Proc. SPIE 4914, High-Power Lasers and Applications II, (5 September 2002); doi: 10.1117/12.481807
Show Author Affiliations
Xiao Hu, Shanghai Jiaotong Univ. and China Institute of Metrology (China)
Dawei Fang, China Institute of Metrology (China)
Zhi Hong, Zhejiang Univ. (China)
Fangyu Hong, China Institute of Metrology (China)
Liang-neng Wu, China Institute of Metrology (China)


Published in SPIE Proceedings Vol. 4914:
High-Power Lasers and Applications II
Dianyuan Fan; Keith A. Truesdell; Koji Yasui, Editor(s)

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