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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Saturation effect on multiphonon relaxation rates of rare earth ions in glasses at high excitation power
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Saturation effect on multiphonon relaxation rates of rare earth ions in glasses at high excitation power

机译：高激发功率下饱和度对玻璃中稀土离子的多声子弛豫速率的影响

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摘要

An increase of the radiative quantum efficiency withincreasing the excitation power is observed for several multipletsof rare earth ions in glasses. The effect of the excited state densityon multiphonon relaxation rates is investigated for different rareearth excited states in oxide or fluoride based glasses. Themultiphonon relaxation rate follows as usual an exponential gaplaw with a coefficient depending on the excited state density. Amodel is proposed to take into account for the saturation of themultiphonon process with increasing the excitation power. Thisbottleneck effect is related to the specific propagation, indisordered structures, of highly energetic vibrations resulting fromthe multiphonon process. Application of our model to optical dataallows us to derive a phonon diffusion length which is in goodagreement with the phonon mean free path estimated from thermalconductivity, heat capacity and sound velocity. Furthermore, theresults are compared with the medium range order deduced fromthe frequency of the boson peak recorded in Raman scattering.
机译：对于玻璃中的几倍的稀土离子，观察到在增加激发功率的情况下辐射量子效率的增加。对于基于氧化物或氟化物的玻璃中不同的稀土激发态，研究了激发态密度对多声子弛豫速率的影响。多声子弛豫率通常遵循指数间隙定律，其系数取决于激发态密度。提出了一种模型，以考虑到随着激发功率的增加，多声子过程的饱和度。这种瓶颈效应与多声子过程产生的高能振动的特定传播，无序结构有关。将我们的模型应用到光学数据中，可以得出声子扩散长度，该声子扩散长度与根据导热系数，热容和声速估算的声子平均自由程一致。此外，将结果与从拉曼散射中记录的玻色子峰频率推导出的中等范围阶次进行比较。

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