Tm3+/Er3+/Ho3+共掺SiO2-Bi2O3-AlF3-BaF2玻璃发光性能

摘要

采用高温熔融法制备了Tm3+/Er3+/Ho3+共掺的铋硅酸盐50SiO2-40Bi2O3-5AlF3-5BaF2玻璃.研究了在808 nm激光器(LaserDiode)激发下Tm3+/Er3+/Ho3+共掺的铋硅酸盐在2 060 nm处的发光性能,同时测试及分析了该铋硅酸盐玻璃的差热特性、吸收光谱及荧光光谱.根据吸收光谱以及Judd-Oflet理论,计算了Ho3+的Judd-Oflet强度参数Ω(t=2,4,6)以及Tm3+/Er3+Ho3+相应的吸收截面.铋硅酸盐玻璃中,Tm2O3、Er2O3和Ho2O3掺杂浓度分别为0.75％、1.0％和0.5％时,2 060 nm处Ho3+∶5I7→5I8发射峰强度达到最大.对Tm3+/Er3/Ho3+3种离子的光谱性质和离子间可能存在的能量传递也做了分析.Ho3+在1 953 nm处的最大吸收截面σabs为9.08×10-21 cm2,在2 060 nm处的最大发射截面σem为1.168×10-20 cm2,辐射寿命τmea为2.75 ms,具有良好的增益效应σemτ(3.212× 10-20 cm2· ms).%The Tm3+,Er3+ and Ho3+ co-doped bismuth silicate glasses 50SiO2-40Bi2O3-5AlF3-5BaF2 were prepared by high-temperature melt-quenching method.The spectroscopic properties of Tm3+,Er3+ and Ho3+ co-doped bismuth silicate at 2 060 nm exited by 808 nm Laser Diode were investigated.Thermal stability of the glasses,absorption spectra and fluorescence spectra of the Tm3+,Er3+ and Ho3+ co-doped glass samples were measured.According to the absorption spectrum and Judd-Oflet theory,the Judd-Oflet intensity parameters of Ho3+ Ωt (t=2,4,6),absorption cross sections of Tm3+,Er3+ and Ho3+ were calculated,respectively.The measured fluorescence spectra manifest that the maximal emission intensity of Ho3+∶5I7→5I8 at 2 060 nm can be achieved at the concentration of 0.75％ Tm2O3,1.0％ Er2O3 and 0.5％ Ho2O3 in bismuth silicate glasses.Besides the spectroscopic properties of Tm3+,Er3+ and Ho3+ separately and possible energy transfer mechanisms among Tm3+,Er3+ and Ho3+ were analyzed and discussed in detail.The maximal absorption and emission cross sections of Ho3+ are 9.08×10-21 cm2 at 1 953 nm and 1.168×10-20 cm2 at 2 060 nm,respectively,with a lifetime of 2.75 ms,while large σemτ achieved (3.212×10-20 cm2· ms) suggesting its efficient application in 2 μm fiber lasers.