摘要
提出了四能级耦合系统的光子雪崩上转换模型。首先从理论上分析了光子雪崩产生的条件, 给出了雪崩阈值以及在低于或高于阈值条件下荧光强度随时间变化关系; 再将该模型结合数值分析应用于Tm 3+ vLiYF4 晶体这一具体实例, 理论分析结果与实验基本一致。
A model of the photon avalanche in a four level coupled system is proposed. The general condition to generate the avalanche has been theoretically analysed. The avalanche threshold and the temporal behavior of the avalanche fluorescence intensity when the pump rate is below or above the threshold are discussed in details. Then this model in combining with the numerical approach is applied to the case of Tm 3+ ∶LiYF 4 crystal. Theoretical results agree with the experiment on the whole. This model and the obtained results are helpful for developing new type avalanche upconversion materials.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2000年第1期19-23,共5页
Acta Optica Sinica
基金
福建省自然科学基金
关键词
光子雪崩
上转换发光
四能级模型
激光器
photon avalanche, upconversion fluorescence, rare earth doped crystal.
