Abstract
In this paper the analysis of upconversion luminescence dynamics in tellurite and germanate glasses doped with Ho<sup>3+</sup> and sensitized by Yb<sup>3+</sup> 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<sub><sup>D2</sup></sub> = 5,0 x 10<sup>-18</sup> cm<sup><sup>3</sup></sup>/s, C<sub>D3</sub> = 1,5 x 10<sup>-17</sup> cm<sup>3</sup>/s and C<sub><sub>D4</sub></sub> = 9,0 x 10<sup><sup>-17</sup></sup> cm<sup>3</sup>/s and in germanate glass C<sub>D2</sub> = 2,80 x 10<sup>-18</sup> cm<sup>3</sup>/s, C<sub>D3</sub> = 6,35 x 10<sup>-18</sup> cm cm<sup>3</sup>/s and C<sub>D4</sub> = 3,56 x 10<sup>-17</sup> cm<sup>3</sup>/s were used to analyze dynamics of upconversion processes.
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