Phonon‐assisted anti‐Stokes fluorescence is observed in an Yb³⁺ doped, 30 mol% BaO containing tellurite glass for the first time. Absorption, excitation, and the anti‐Stokes fluorescence spectra of the glass show a phonon progression of 150 cm⁻¹. The phonon is identified as the combined vibrational mode of rocking of the nonbridging oxygen atoms of both TeO₃⁻ and its dimer Te₂O₅²⁻ units and the bending of the Te–O–Te linkage of the Te₂O₅²⁻ units of the glass structure. These units are known to exist in plenty in such BaO–TeO₂ glasses with high BaO content. Association of the phonon modes with the absorption and anti‐Stokes fluorescence spectra of Yb³⁺ of the glass, strongly suggests that the phonon is coupled both with the ²F_7/2(1) ground and the ²F_5/2(5) excited states of the ion; and the observed anti‐Stokes fluorescence originates through annihilation of the excited state manifolds of this coupled phonon. Phononics and spectroscopic analysis of the anti‐Stokes fluorescence process suggest that the material should be prospective for use as solid‐state laser cooler.

中文翻译：

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Yb3 +掺杂氧化物玻璃的声子辅助抗斯托克斯荧光技术：声子学和光谱分析作为固态激光冷却器的前景

首次在掺Yb ^3+的含30 mol％BaO的碲酸盐玻璃中观察到了声子辅助的反斯托克斯荧光。玻璃的吸收，激发和反斯托克斯荧光光谱显示声子级数为150 cm ^-1。声子被识别为两个的TeO的非桥键氧原子的摆动的组合振动模式₃ ^-和其二聚体碲_2个ö ₅ ^2-单元和TE上的TeO-TE连杆的弯曲₂ ø ₅ ^2-玻璃结构的单位。已知这些单元大量存在于BaO–TeO _2中BaO含量高的玻璃。声子模式与玻璃的Yb ³⁺的吸收光谱和反斯托克斯荧光光谱的关联强烈表明，声子与² F _7/2（1）地面和² F _5/2（5 ）离子的激发态；并且观察到的反斯托克斯荧光是通过through灭该耦合声子的激发态流形而产生的。对Stokes荧光过程的声子学和光谱分析表明，该材料应有望用作固态激光冷却器。