选取玻璃组分60SiO2-xBi2O3-(30-x)B2O3-2K2O-7Na2O-1Yb2O3(以mol％记,x=0,5,10,15,20,25,30)为研究对象。通过测试试样的物理性质和光谱性质,应用倒易法(reciprocity method)计算Yb3+离子的受激发射截面(σemi),并且计算了Yb3+的自发辐射几率(Arad),2F5/2能级的辐射寿命(Trad)。讨论了玻璃中Bi2O3和B2O3的组成变化对其物理性质、Yb3+离子的吸收特性、发光特性以及OH-离子对实测Yb3+荧光寿命(Tf)的影响。结果表明:Yb3+掺杂的Si2-Bi2O3-B2O3具有较好的光谱性能,是一种新型的Yb3+掺杂双包层光纤候选基质材料。
Yb3+-doped 60 SiO2-xBi2O3-(30-x)B2O3-2K2O-7Na2O-1Yb2O3(x=0, 5, 10, 15, 20, 25, 30) were prepared. The physical and spectroscopic properties of Yb3+doped SiO2-
Bi2O3-B2O3 were studied. The refractive index, density of Yb3+ doped SiO2-Bi2O3-B2O3 glasses increase with the increase of Bi2O3 content, while the Tg, Tf
decrease with the increase of Bi2O3 content. The system of 60 SiO2-15Bi2O3-15B2O3-2K2O-7Na2O-1Yb2O3 glass possesses higher asymmetry. This sample exhibits higher peak absorption
cross section(σabs) and integrated absorption cross section (Σabs):1.97pm2 and 5.32×104pm3 respectively. Also this glass has higher spontaneous emission probability(Arad)
1620S-1, the τrad (calculated emission lifetime) is 0.617ms. The measured emission lifetime(τf) has strong relations with the
OH- content in glasses, as the B2O3 content increases from 0mol% to 30mol%, the τm increases from 0.39 to 0.87ms.
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