Investigation of upconversion luminescence in antimony–germanate double-clad two cores optical fiber co-doped with Yb3+/Tm3+ and Yb3+/Ho3+ ions

Abstract In the paper double-clad optical fiber with two off-set cores co-doped with 1Yb 2 O 3 –0.1Tm 2 O 3 and 1Yb 2 O 3 –0.5Ho 2 O 3 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 478 nm ( 1 G 4 → 3 H 6 ) and 650 nm ( 1 G 4 → 3 F 4 ) in glasses doped with Tm 3+ ions and 545 nm and 655 nm, corresponding to the 5 F 5 → 5 I 8 and 5 F 4 → 5 I 8 transitions in holmium ions. The energy transfer efficiency in glasses used as optical fiber cores was η Tm =56% (0.1 mol% Tm 2 O 3 ) and η Ho =85% (0.5 mol% Ho 2 O 3 ), respectively. As a result of excitation of the fabricated optical fiber ( λ exc =976 nm), a UC luminescence spectra was obtained. Superposition of three emission bands at the wavelengths of 481 nm (Tm 3+ : blue), 545 nm (Ho 3+ :green) and 665 nm (Tm 3+ , Ho 3+ : red) from two separated cores was measured. Influence of fiber length and excitation power on the color coordinates (CIE-1931) have been also investigated.

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