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The near-infrared emission of low phonon (805 cm−1) germanate glasses from GeO2-Ga2O3-BaO system co-doped with 0.7Yb2O3/(0.07–0.7)Ho2O3 ions has been investigated. Luminescence at 2.1 µm corresponding to 5I7 → 5I8 transition in holmium was obtained by energy transfer between Yb3+ and Ho3+ ions. The highest value of the luminescence intensity was obtained in glass co-doped with 0.7Yb2O3/0.15 Ho2O3...
In the paper double-clad optical fiber with two off-set cores co-doped with 1Yb2O3–0.1Tm2O3 and 1Yb2O3–0.5Ho2O3 has been investigated. Antimony–germanate glass was melted as a matrix for active cores. The concentration of lanthanides and their ratio have been optimized to achieve maximum upconversion emission intensity at 478nm (1G4→3H6) and 650nm (1G4→3F4) in glasses doped with Tm3+ ions and 545nm...
In the paper upconversion luminescence properties in Yb3+/Tm3+ co-doped antimony–germanate glass and double-clad optical fiber were studied. The concentration of lanthanides, which has shown the highest upconversion emission intensity at 478nm (1G4→3H6) and 650nm (1G4→3F4), is 1Yb2O3/0.1Tm2O3(mol%) as a result of exciting with a laser diode (976nm). The lifetime of 2F5/2 (Yb3+) level decreases from...
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