In this paper Tm-doped tellurite glasses (75TeO2-20ZnO-5 Na2O, mol%) were prepared and characterized, and codoping
with Yb was investigated in order to improve pump efficiency and wavelength emission range. Emission spectra and
lifetime measurements were obtained by pumping Tm-doped tellurite glasses at 800 nm and Yb-Tm co-doped tellurite
glasses at 980 nm, thus exploiting the Yb-Tm energy transfer mechanism. Highly Yb-doped Tm-tellurite glasses were
investigated (Yb2O3 concentrations up to 5 wt%) and an increase in 3F4 lifetime with Yb2O3 concentrations higher than
3% was observed. This showed that high amounts of Yb do not affect lifetime of the metastable state, thus allowing
investigation of lasers in this range of doping concentrations.
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