Effect of Tm~(3+) Sensitization to Ho~(3+) Doped GeO2-B2O3-BaF2-Al2O3-ZnO2-Na2O Glass on Spectral Properties

摘要

A series of Tm~(3+)/Ho~(3+) sensitized 65GeO2-7BaF2-10B2O3-4Al2O3-4ZnO2-10Na2O glass samples were synthesized by using high temperature melting method. The spectral properties were systematically studied when Ho~(3+)concentration was 0.1,0.3,0.5 mol % and Tm203 changed from 0.3 to 2.5 mol %. Differential thermal analysis showed that AT was higher than 190 °C, which illustrated this kind of matrix glass have better thermal stability. The absorption cross section peak height, free energy of Ho~(3+) from ~5I8 to ~5I7 and emission cross section were calculated according to Mc-Cumber theory. Under the excitation of 808 nm laser diode, fluorescence intensity at 1954 nm reached the highest value when the concentration of Ho~(3+) was 0.1 mol % and Tm~(3+) was 0.7 mol %. However the fluorescence intensity reduced greatly when Ho~(3+) concentration was 0.5 mol % and Tm~(3+) exceeded 1.5 mol %. The sensitized function and influence of different Tm~(3+)/Ho~(3+) doped ion ratios on the spectral properties was studied.