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In the article the cooperative energy transfer in GeO₂-GaO-BaO glass system doped with Yb^{3+}/Tb^{3+} under 980 nm laser diode excitation was investigated. The influence of Tb^{3+} concentration on the luminescent properties was determined. Measured strong luminescence at 489, 543, 586, 621 corresponds to ⁵D₄ → ⁷F_{J} (J = 6, 4, 3) transitions and luminescence at 381, 415, 435 nm results from ⁵D₃,...
The infrared emission of Tm^{3+}/Ho^{3+}-doped antimony-silicate optical fiber has been presented. Luminescence at 2.1 μm corresponding to ⁵I₇ → ⁵I₈ transition in holmium was obtained by energy transfer between Tm^{3+} and Ho^{3+} ions. According to the Förster-Dexter theory, the efficiency of energy transfer of the ³F_4 (Tm^{3+}) → ⁵I₇ (Ho^{3+}) transition was calculated. The optimization of the...
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