A novel double-cladding Ho3+/Tm3+ co-doped Bi2O3-GeO2-Ga2O3-BaF2 glass fiber, which can be applied to a 2.0-mu m infrared laser, was fabricated by a rod-tube drawing method. The thermal properties of the glass were studied by differential scanning calorimetry. It showed good thermal stability and matching thermal expansion coefficient for fiber drawing when T-x-T-g > 193 degrees C and the maximum difference of the thermal expansion coefficient is 3.55 x 10(-6)/degrees C or less. The 2.0-mu m luminescence characteristics were studied using the central wavelength of 808 nm pump light excitation. The results show that when the concentration ratio of Ho3+/Tm3+ reaches 0.5 mol%:1.0 mol%, the maximum fluorescence intensity was obtained in the core glass, the emission cross section reached 10.09 x 10(-21) cm(2), and the maximum phonon energy was 751 cm(-1). In this paper, a continuous laser output with a maximum power of 0.986 W and a wavelength of 2030 nm was obtained using an erbium-doped fiber laser as a pump source in a 0.5 m long Ho3+/Tm3+ co-doped glass fiber. In short, the results show that Ho3+/Tm3+ co-doped 36Bi(2)O(3)-30GeO(2)-15Ga(2)O(3)-10BaF(2)-9Na(2)O glass fiber has excellent laser properties, and it is an ideal mid-infrared fiber material for a 2.0-mu m fiber laser with excellent characteristics