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This work reports the mid-infrared emission properties around 2 μm in Ho3+/Yb3+ codoped germanate glasses.The glass not only possesses good chemical durability and good thermal stability but also has high mid-infrared transmittance around 2 μm(90%).In addition,the glass possesses considerably low OHˉ content(20.45 ppm)and large spontaneous transition probability(103.38 s-1)corresponding to the Ho3+5:I7→5I8transition.Moreover,the measured lifetime of Ho3+5:I7 level is as high as 7.68 ms,and the quantum efficiency at 2 μm can reach 79.4%.The energy transfer processes ofYb3+2:F5/2 level and Ho3+5:I6 levels were quantitatively analyzed according to the rate equation.Results indicate that the prepared germanate glass is a promising candidate for 2 μ rm mid-infrared laser materials applications.