Abstract
In this study, we report spectroscopic properties of Tm 3+ and Ho 3+ codoped tellurite glasses over a wide dopant concentration range in order to assess their potential laser performance under 790 nm diode laser excitation. The impact of Tm 3+ and Ho 3+ concentrations is investigated to identify specific candidates for fiber laser operation. The emission cross section is calculated and discussed, as well as the gain coefficient of this type of glasses. Energy transfer microparameters and critical ion distances are determined for 3H 4, 3F 4 (Tm 3+), and 5I 7 (Ho 3+) emission levels in the framework of diffusion-limited regime and dipole–dipole interaction. We also report thermal properties of tested glasses.
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