Spatial distribution effects and laser efficiency in Er/Yb-doped fibers
Spatial distribution effects and laser efficiency in Er/Yb-doped fibers
复制标题
掺铒光纤中的空间分布效应和激光效率
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
B. Knappe
中科院分区：
文献类型：
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作者：
J. Kirchhof;S. Unger;A. Schwuchow;S. Jetschke;B. Knappe
众所周知，高水平的磷共掺杂可以大大提高硅基Er/Yb光纤激光器和放大器的效率。在制备过程中，磷与稀土元素以及与另外的共掺杂剂铝的相互作用导致关于掺杂剂掺入、扩散行为和微观玻璃结构的化学性质的特殊效应。然而，到目前为止，人们一直忽视这些相互作用会在预制棒和光纤中产生强烈的径向甚至轴向浓度分布（对于共掺杂剂磷和铝，以及稀土成分铒和镱），对激光器产生显着影响效率。在这里，我们已经研究了掺入机制和扩散行为（扩散系数依赖于温度和浓度）的X射线微探针分析有关的掺杂剂的相互作用的影响。此外，我们已经调查了荧光强度和寿命，径向和轴向解决在光纤预制件。实验结果与用这种预制棒制成的双包层光纤激光器的性能进行了对比。第一次尝试已经进行了解释和控制的掺入机制的基础上，模型计算磷扩散和化学。
It is well known that the efficiency of silica based Er/Yb fiber lasers and amplifiers can be greatly enhanced by a high level of phosphorus co-doping. The interaction of phosphorus with the rare earths and with the further co-dopant aluminium during the preparation process leads to peculiar effects concerning chemistry of dopant incorporation, diffusion behaviour and microscopic glass structure. Until now however, it has been disregarded that these interactions give rise to strong radial and even axial concentration profiles in preform and fiber (for the codopants phosphorus and aluminium, but also for the rare earth components erbium and ytterbium) with remarkable consequences for the laser efficiency. Here, we have studied the incorporation mechanism and the diffusion behaviour (diffusion coefficients in dependence on temperature and concentrations) by X-ray microprobe analysis concerning the dopant interaction effects. Moreover, we have investigated both fluorescence intensities and lifetimes, radially and axially resolved in the fiber preforms. The results were correlated with the properties of double clad fiber lasers made from these preforms. First attempts have been undertaken to interpret and control the incorporation mechanism on the basis of model calculations regarding phosphorus diffusion and chemistry.