Shen Xiang, Nie QiuHua, Xu TieFeng, Gao Yuan
Faculty of Information Science and Engineering, Ningbo University, Zhejiang 315211, China.
Spectrochim Acta A Mol Biomol Spectrosc. 2005 Jul;61(9):2189-93. doi: 10.1016/j.saa.2004.08.016.
The spectral properties of Er3+/Yb3+ codoped tungsten-tellurite (WT) glasses have been investigated. The measured absorption spectra are analyzed by Judd-Ofelt theory. The compositional change of intensity parameter omega2 is attributed to the change in the covalency between the Er3+ and oxygen ions, the asymmetry in the local structures around the Er3+ ions can be neglected. The lifetimes of 4I(13/2) level of Er3+ in WT glasses are measured and comparable with other TeO2-based glasses. The stimulated emission cross-section is calculated based on McCumber theory. The fluorescence full width at half maximum (FWHM) and the emission cross-section (sigma(peak)) of the 4I(13/2) --> 4I(15/2) transition of Er3+ in different glass hosts have been compared. The suitability of such WT glasses as host materials for 1.5 microm broadband amplification is discussed.
研究了Er3+/Yb3+共掺杂钨碲酸盐（WT）玻璃的光谱特性。利用Judd-Ofelt理论对测得的吸收光谱进行了分析。强度参数ω2的成分变化归因于Er3+与氧离子之间共价性的变化，Er3+离子周围局部结构的不对称性可忽略不计。测量了WT玻璃中Er3+的4I(13/2)能级寿命，并与其他基于TeO2的玻璃进行了比较。基于McCumber理论计算了受激发射截面。比较了不同玻璃基质中Er3+的4I(13/2)→4I(15/2)跃迁的荧光半高宽（FWHM）和发射截面（σ(peak)）。讨论了此类WT玻璃作为1.5微米宽带放大基质材料的适用性。
