2-μm emission performance of Tm3+-HO3+ co-doped tellurite glasses

The emission properties of 2-mu m region fluorescence of Tm3+-Ho3+ co-doped tellurite glasses are investigated. Introducing F- ions to the composition of tellurite glasses plays a positive effect on the 2-mu m emission. A maximum intensity of 2-mu m emission is achieved when 1.5-mol% Tm2O3 and 1-mol% Ho2O3 concentration are doped in the glasses. The emission cross section and gain coefficient of the I-5(8)-> I-5(7) transition of Ho3+ are calculated. The emission cross section has a maximum of 1.29x10(-20) cm(2) at 2048 nm wavelength. The results indicate that Tm3+-Ho3+ co-doped tellurite glasses are suitable for 2-mu m application.