Tm(3＋)和Ho(3＋)双掺锗铌酸盐玻璃的中红外发光性质

MID-INFRARED LUMINESCENCE PROPERTIES OF Tm^(3+) AND Ho^(3+) CO-DOPED GERMANATE-NIOBATE GLASSES

用高温熔融法制备了Tm^(3+)和Ho^(3+)双掺的86GeO_2-4Nb_2O_5-10Na_2O锗铌酸盐玻璃,应用Judd-Ofelt理论,获得了Tm^(3+)的强度参量及Tm^(3+)的自发辐射跃迁几率、辐射寿命等光谱参量。根据McCumber理论,计算了玻璃中Tm^(3+)能级~3H_6→~3F_4跃迁和Ho^(3+)能级~5O_8→~5I_7跃迁和Ho^(3+)的吸收截面σ_a受激发射截面σ_a和增益光谱G(λ)。在808 nm激光二极管激发下,研究分析了Tm^(3+)敏化Ho^(3+)的2.0μm的红外发射光谱。结果表明:Ho^(3+)的共掺提高了Tm^(3+)(~3F_4)→Ho^(3+)(~5I_7)之间的能量转移效率,增强了2.0μm的红外发光。

Germanate-niobate glasses with the compositions of 86GeO_2-4Nb_2O_5-10Na_2O codoped with Tm^（3＋） and Ho^（3＋） ions were fabricated by conventional melting method.According to the Judd-Ofelt theory,the J-O strength parameters of Tm^（3＋） were calculated, by which the radiative transition probabilities and radiative lifetimes were estimated.According to McCumber theory,the absorption and emission cross-sections corresponding to the ~3H_6→~3F_4 transition of Tm^（3＋） and the ~5I_8→~5I_7 transition of Ho^（3＋） have been obtained and the gain cross section spectra were also obtained,too.With 808 nm laser diode excitation,the infrared emission spectra of Tm^（3＋） sensitized Ho^（3＋） ions were studied.The results indicated that the energy transfer efficiency of Tm^（3＋）（~3F_4）→Ho^（3＋）（~5I_7） ions was enhanced and the infrared fluorescence intensity at 2.0μm was increased as Ho^（3＋） was co-doped into the glasses.