作　　者： ; ; ; ; ;

机构地区： 中山大学

出　　处： 《光子学报》 2003年第8期914-916,共3页

摘　　要： 用可变延时的双光束激光激发固态样品 ,同时测量样品的线性荧光和上转换荧光强度 .理论上用Bloch方程描述了激发态吸收上转换过程 ,通过数量方法解Bloch方程 ,得到了与激发态吸收过程相关的各能级粒子数布居随时间的变化关系 ,计算出荧光强度 ,得到有一定延时的两束光的相干光谱 ,相干光谱的计算结果和实验结果一致 . Linear fluorescence and upconversion fluorescence were simultaneously measured through solid state samples excited by two laser pulses with variable time delay.Excited state absorption resulting in upconversion was described with optical Bloch equations.Numerical method was applied to find the temporal dependence of the number of population at the relevant energy levels.Integrated population and hence fluorescence intensity were obtained.For two laser pulses with a definite delay.the relationship between fluorescence intensity and the delay time,i.e.,the coherent spectroscopy,was evaluated with the above method.The calculation results are found to be consistent with the experimental ones.

关 键 词： 上转换 相干光谱 激发态吸收

领　　域： [电子电信]