2 \mu m emission performance of Tm

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