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Avalanche up-conversion processes in Pr, Yb-doped materials

机译:Pr,Yb掺杂材料中的雪崩上转换过程

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摘要

The general characteristics of the 'photon-avalanche'up-conversion process are presented. The Pr,Yb system wasspectroscopically investigated in Pr;Yb is to YliF_4 and Pr,Yb isto YalO_3 with respect to the realization and understanding of thisprocess. Whereas Pr,Yb is to YliF_4 exhibits an avalanche-typeexcitation mechanism under infrared pumping, no such behavior isobserved for Pr,Yb is to YalO_3. A time dependent rate equationmodel was developed to describe these different behaviors usingexperimentally determined parameters. The absence of anavalanche-type excitation mechanism in Pr,Yb is to YalO_3 ismainly caused by (i) a better spectral overlap between the excitedstate absorption in the Pr and the ground state absorption of Yb, (ii)higher transfer rates between Yb and Pr and within the Pr, and (iii)lower intrinsic decay rates from the participating excited energylevels (~3P_(0,1,2) and ~1G_4).
机译:介绍了“光子-雪崩”上转换过程的一般特征。关于该过程的实现和理解,在Pr中对Pr,Yb系统进行了光谱研究; Yb为YliF_4,Pr,Yb为YalO_3。 Pr,Yb对YliF_4表现出在红外泵浦下的雪崩型激发机制,而Pr,Yb对YalO_3则没有观察到这种行为。建立了一个随时间变化的速率方程模型,使用实验确定的参数来描述这些不同的行为。 Pr,Yb中缺乏雪崩型激发机制是因为YalO_3主要是由于(i)Pr中的激发态吸收与Yb的基态吸收之间的光谱重叠更好,(ii)Yb和Pr之间的转移速率更高在Pr范围内;以及(iii)从参与的激发能级(〜3P_(0,1,2)和〜1G_4)降低固有衰减率。

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