Er^(3+)/Ce^(3+)共掺碲铌酸盐玻璃的制备及光学特性研究

Fabrication of Er^(3+)/Ce^(3+) co-doped tellurite-niobium glasses and the improvement of spectroscopic properties

采用高温熔融退火法制备了系列75TeO2-10Nb2O5-10ZnO-5Na2O-0.5Er2O3-xCe2O3(x=0.00,0.25,0.50,0.75,1.00mol%)和(75-y)TeO2-10Nb2O5-10ZnO-5Na2O-yB2O3-0.5Er2O3-0.75Ce2O3(y=2,5,10,15mol%)碲铌酸盐玻璃,测试了玻璃样品的吸收光谱、上转换光谱、1.53μm波段荧光谱、Er3+荧光寿命和拉曼光谱,结合Judd-Ofelt理论和McCumber理论计算了Er3+光谱参数。结果表明,在掺Er3+碲铌酸盐玻璃中引入Ce3+进行Er3+/Ce3+共掺,通过Er3+:4I 11/2能级与Ce3+:2 F5/2能级间的能量传递过程,可以有效抑制Er3+上转换发光并明显增强其1.53μm波段荧光。同时,实验发现,适量B2O3组分的引入,可以进一步提高1.53μm波段荧光强度,而荧光发射谱宽进一步展宽。

A series of 75TeO2-10Nb2O5-10ZnO-5Na2O-0.5Er2O3-xCe2O3=（x=0.00,0.25,0.50,0.75,1.00mol%） and （75-y）TeO2-10Nb2O5-10ZnO～5Na2O～yB2O3-0.5Er2O3-0.75Ce2O3（y=2,5,10,15mol%）tellurite-niobium glasses were prepared by conventional high-temperature melting and annealing method. The absorption spectra, upconversion spectra, 1.53μm band fluorescence spectra, flu orescence lifetime of Er3＋ and Raman spectra of glass samples were measured,and the spectroscopic pa rameters of Er3＋ were calculated and analyzed with the help of Judd-Ofelt theory and McCumber theory, respectively. The results indicate that the upconversion fluorescence can be suppressed effectively and the 1.53μm band fluorescence can be enhanced evidently owing to the energy transfer Ers＋ ：4 I 1l/2 Ce3＋ ：2F5/2 when the Ce3＋ ions are introduced into the Er3＋-doped tellurite-niobium glasses. Mean- while, the 1.53μm band fluorescence intensity can be improved and the fluorescence spectral width can be broadened further when an appropriate amount of B2O3 is introduced. The research results can pro vide practical significance to obtain tellurite-niobium glasses applied for the 1.53 μm band EDFA with excellent spectroscopic characteristics.