Yb3+掺杂SiO2-Bi2O3-B2O3玻璃的物理性质及光谱性质

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(σ_emi),并且计算了Yb³⁺的自发辐射几率(A_rad),²F_5/2能级的辐射寿命(T_rad)。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(T_f)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。

Physical and Spectroscopic Properties of Yb3+-doped SiO2-Bi2O3-B2O3 Glasses

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 T_g, T_f 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(σ_abs) and integrated absorption cross section (Σ_abs):1.97pm² and 5.32×10⁴pm³ respectively. Also this glass has higher spontaneous emission probability(Arad) 1620S^-1, the τ_rad (calculated emission lifetime) is 0.617ms. The measured emission lifetime(τ_f) has strong relations with the OH^- content in glasses, as the B₂O₃ content increases from 0mol% to 30mol%, the τ_m increases from 0.39 to 0.87ms.