In this paper the analysis of upconversion luminescence dynamics in tellurite and germanate glasses doped with Ho 3+ and sensitized by Yb 3+ in 8:1 molar ratio was presented. Population of energy levels was calculated using Runge-Kutta method. The influence of pump power (976 nm) radiation on population of excited levels and the possible upconversion mechanisms were analyzed. The energy transfer coefficient in tellurite glass C D2 = 5,0 x 10 -18 cm 3 /s, C D3 = 1,5 x 10 -17 cm 3 /s and C D4 = 9,0 x 10 -17 cm 3 /s and in germanate glass C D2 = 2,80 x 10 -18 cm 3 /s, C D3 = 6,35 x 10 -18 cm 3 /s and C D4 = 3,56 x 10 -17 cm 3 /s were used to analyze dynamics of upconversion processes.

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