摘要
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 phenomena induced by 966 nm diode laser in Er∶ZBLAN and Yb、 Er∶ZBLAN glasses are studied. A new kind of quasi avalanche up conversion luminescence phenomenon is found. The results calculated from state rate equations are coincident with the experiment. When cross relaxation P between Er 3+ ions is very small, up conversion fluorescence intensity enhances gradually along with the increase of pumping laser power and tends gradually to saturation; when cross relaxation P is large, duo to the large energy cross transfer of Yb、 Er∶ZBLAN glass between Yb 3+ and Er 3+ ions, the upconversion excitation velocity R of Er 3+ ion is high enough to lead the up conversion luminescence having a steep raise before it gets saturation. This is the phenomenon of “second uprising” observed in the experiment induced by quasi avalanche effect.
出处
《光学学报》
EI
CAS
CSCD
北大核心
1999年第12期1698-1704,共7页
Acta Optica Sinica
基金
国家自然科学基金!(19874033)
国家教育部博士点基金
国家重点基础研究发展规划项目!(G1998061311)
关键词
上转换发光
类雪崩效应
激光材料
ZBLAN玻璃
up conversion luminescence, quasi avalanche effect, “second uprising” phenomenon, Yb 3+ and Er 3+ ions, ZBLAN glasses.
