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首页> 外文期刊>Optical Materials >Vibronics in optical spectra of Yb3+ and Ce3+ in YAG and Y2O3 ceramics
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Vibronics in optical spectra of Yb3+ and Ce3+ in YAG and Y2O3 ceramics

机译：YAG和Y2O3陶瓷中Yb3 +和Ce3 +光谱中的振动电子学

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The optical spectra of Yb3+ in YAG and Y2O3 and Ce3+: YAG show complex structure with contributions of vibronic satellites that extend beyond the spectral range delineated by the pure electronic transitions. The rather strong vibronic satellites are connected to the enhanced electron-phonon interaction of the RE3+ ions at the ends of 4f(n) series. Thus, tentatively we suggest that some of reported satellites in infrared absorption of Ce3+ in YAG crystals could be vibronics. The optical spectra of our Yb-doped YAG and Y2O3 ceramics are similar to those reported for single crystals. The vibrotlic lines intensities comparable with other lines of Yb makes separation of the zero-phonon lines from vibronics very difficult, particularly for Y2O3 which has two cationic sites. Measurements of optical spectra of Yb- and (Nd,Yb)doped ceramics under direct excitation in Yb3+ or via energy transfer from Nd3+ and comparison with the phonon spectra enables such separation and identification of Stark level structures. The particularly large intensities of the vibronic lines in vicinity of the zero-phonon lines can be connected to near resonant effects between the phonon energies and the Stark splitting of manifolds, that are also responsible for the broadening of electronic lines corresponding to transitions to high energy levels of F-2(5/2,7/2) manifolds (even at 10 K by phonon emission). This analysis indicates that the observed one micron spectra of Yb-doped YAG and Y2O3 ceramics belong exclusively to Yb3+. (C) 2016 Elsevier B.V. All rights reserved.
机译：YAG中的Yb3 +的光谱以及Y2O3和Ce3 +：YAG中的Yb3 +的光谱显示出复杂的结构，其中有电波卫星的贡献，其范围超出了纯电子跃迁所描绘的光谱范围。相当强大的振动卫星与4f（n）系列末端的RE3 +离子增强的电子-声子相互作用相关。因此，我们暂时性地建议，YAG晶体中红外吸收Ce3 +的某些报道的卫星可能是振动电子。我们掺Yb的YAG和Y2O3陶瓷的光谱与报道的单晶相似。可与Yb的其他谱线相媲美的谱线强度使得很难将零声子谱线与振子学分离，尤其是对于具有两个阳离子位点的Y2O3。在Yb3 +中直接激发下或通过Nd3 +的能量转移对掺Yb和（Nd，Yb）陶瓷的光谱进行测量，并与声子光谱进行比较，从而可以分离和鉴定Stark能级结构。零声子线附近的振动线的特别大的强度可以连接到声子能量和歧管的斯塔克分裂之间的近共振效应，这也负责对应于向高能跃迁的电子线的加宽F-2（5 / 2,7 / 2）流形的水平（甚至在10 K时通过声子发射）。该分析表明，观察到的掺Yb的YAG和Y2O3陶瓷的1微米光谱仅属于Yb3 +。 （C）2016 Elsevier B.V.保留所有权利。

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