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研究了Er3+ vZBLAN 和(Yb3+ , Er3+ )vZBLAN玻璃在966 nm 半导体激光激发下的上转换发光现象, 发现在(Yb3+ , Er3+ )vZBLAN 玻璃样品上存在由Er3+ 离子间交叉弛豫导致的上转换发光随激光功率二次攀升的类雪崩上转换发光现象; 并且由稳态速率方程的数值计算得出与实验测量相吻合的结果: 当Er3+ 离子间的交叉弛豫P很小时, 上转换发光是随抽运激光功率的增强而逐渐趋向饱和的; 当P 较大时, (Yb3+ , Er3+ vZBLAN 玻璃由于Yb3+ 和Er3+ 离子间的交叉能量传递速率很大, 致使Er3+ 离子的上转换激发速率R很大, 造成上转换发光在达到饱和之前出现一个陡升, 这就是实验观察到的由类雪崩效应导致的上转换发光随激光功率二次攀升的现象。
The upconversion luminescence of Er3 + vZBLAN and (Yb3 +, Er3 +) vZBLAN glasses under the excitation of 966 nm semiconductor laser was investigated. The upconversion luminescence caused by Er2 + interlattice relaxation on (Yb3 +, Er3 +) vZBLAN glass was observed The avalanche-like up-conversion avalanche phenomenon with the second rise of the laser power, and the numerical results from the steady-state rate equation are in good agreement with the experimental results. When the crossed relaxation P between Er3 + ions is small, the up- When the P is large, the up-conversion excitation rate R of Er3 + ions is very large due to the large energy transfer rate between Yb3 + and Er3 + ions in the Yb3 + and Er3 + vZBLAN glasses The upconversion luminescence shows a steep rise before reaching saturation, which is the experimentally observed phenomenon that the up-converted luminescence caused by the avalanche-like effect increases twice with the laser power.