Amplification and diffusion of spontaneous emission in strongly scattering medium
Amplification and diffusion of spontaneous emission in strongly scattering medium
复制标题
强散射介质中自发辐射的放大和扩散
DOI：
10.1063/1.373432
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发表时间：
2000
影响因子：
3.2
通讯作者：
M. Tomita
中科院分区：
文献类型：
--
作者：
K. Totsuka;G. Soest;Tetsu Ito;A. Lagendijk;M. Tomita
我们通过实验检查了嵌入强散射介质中的染料的光谱塌陷阈值作为激发光束直径和传输平均自由程的函数，以便找到最小化阈值的条件。我们发现了一个临界传输平均自由程，低于该阈值脉冲能量几乎与平均自由程无关。基于速率和扩散方程的理论模型很好地解释了实验观察结果，该模型表明发光光谱也取决于介质中的位置。
We experimentally examined the threshold of the spectral collapse in dye embedded in a strongly scattering medium as a function of the excitation beam diameter and the transport mean free path in order to find a condition to minimize the threshold. We found a critical transport mean free path, below which the threshold pulse energy is almost independent of the mean free path. Experimental observations are well explained by a theoretical model based on the rate and diffusion equations, which shows that the luminescence spectra are also dependent on the position in the medium.