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Re-absorption and nonradiative energy transfer in vibronic laser gain media
Optical Engineering ( IF 1.3 ) Pub Date : 2021-05-01 , DOI: 10.1117/1.oe.60.5.056103
Jonathan W. Evans 1 , Thomas R. Harris 1 , Eric J. Turner 1 , Martin M. Kimani 1 , J. Matthew Mann 1 , Ronald W. Stites 1 , Gary Cook 1 , Kenneth L. Schepler 2
Affiliation  

Fe:ZnSe and other transition metals have broad upper and lower energy manifolds that give rise to broad absorption and fluorescence bands in the mid-infrared spectral region. Energy transfer between Fe2 + ions via re-absorption of fluorescence (due to the spectral overlap of these bands) and phonon-assisted energy transfer (due to the lattice dynamics of ZnSe) becomes more probable with increasing Fe2 + concentration. Here, we treat these processes as additional terms in the rate equations that govern the spontaneous decay of the Fe2 + ion. This treatment gives insight into anomalous behavior seen in the thermal lifetime of the Fe:ZnSe system. We also apply the model to other transition metal-doped II–VI materials.

中文翻译:

振动激光增益介质中的重吸收和非辐射能量转移

Fe:ZnSe和其他过渡金属具有宽泛的上,下能量歧管,在中红外光谱区中产生宽的吸收带和荧光带。随着Fe2 +浓度的增加,通过重新吸收荧光(由于这些谱带的光谱重叠)和通过声子辅助的能量转移(由于ZnSe的晶格动力学),Fe2 +离子之间的能量转移变得更有可能。在这里,我们将这些过程视为控制Fe2 +离子自发衰减的速率方程式中的其他项。通过这种处理,可以洞悉在Fe:ZnSe系统的热寿命中观察到的异常行为。我们还将模型应用于其他过渡金属掺杂的II-VI材料。
更新日期:2021-05-19
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