研究了掺铒TeO2-BaO-TiO2-La2O3碲酸盐玻璃的热稳定性及Er3+离子的吸收和荧光光谱性质。应用Judd-Ofelt理论计算了玻璃的强度参数Ωt(t=24、、6)、Er3+离子在玻璃中的谱线强度、自发辐射几率以及辐射寿命。应用McCumber理论计算了受激发射截面。分析了TiO2对碲酸盐玻璃热稳定性和光谱性能影响,碲酸盐玻璃中含0—5%摩尔分数TiO2时可以有效地改善玻璃的热稳定性。该玻璃系统具有较好的增益带宽和热稳定性,适合于作为掺铒碲酸盐光纤放大器用基质材料。

Thermal Stability and Spectroscopic Properties of Er~(3+)-doped Tellurite GlassesSUN Jian~(1,2),LIU Yue-hui~(1,2),CHEN He~(1,2),ZHANG Qin-yuan~(1,2)(1.Institute of Optical Communication Materials,South China University of Technology,Guangzhou 510640,China; Key Laboratory of Specially Functional Materials and Advanced Manufacturing Technology of Ministry of Education,South China University of Technology,Guangzhou 510640,China)The thermal stability,absorption spectrum and fluorescence spectrum of Er~(3+)-doped tellurite glass system TeO_2-BaO-TiO_2-La_2O_3 were investigated.The intensity parameters Ω_t(t=2、4、6),the line strength,spontaneous radiation rates and radioactive lifetimes of Er~(3+) were calculated by the Judd-Ofelt theory.Stimulated emission cross section was calculated by McCumber theory.The influences of TiO_2 to thermal stability and spectroscopic properties for the tellurite glass were analyzed.The concentration of TiO_2(0—5%) in the glass results in a better thermal stability.This tellurite glass system was suitable for as host of broadband erbium-doped fiber amplifier due to their advantages on the good thermal stability and a broad bandwidth.tellurite glass;titania;thermal stability;spectroscopic properties