Upconversion Luminescence in Yb3+/Tm3+ Doped Double Clad Optical Fibre
J. Zmojda, D. Dorosz, M. Kochanowicz and J. Dorosz
Department of Optoelectronics and Lighting Technology, Białystok University of Technology, Wiejska 45, 15-351 Białystok, Poland
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The paper presents luminescence properties of telluride glass doped with Yb3+/Tm3+ ions. Strong blue emission at 477 nm corresponding to the transition 1G43H6 in thulium ions was measured under the excitation of a 976 nm diode laser. The dependence of the upconversion: emission upon the thulium ions concentration was studied in order to determine the optimal ion content. The results showed that intensity of upconversion emission enhances, with the increase of Tm3+ content up to 0.1 mol.%. The most effective energy transfer Yb3+ → Tm3+ occurs in the glassy matrix with molar ratio of dopant 1 Yb3+ : 0.1 Tm3+. Double-clad optical fibre was made of glass with the highest upconversion intensity at the wavelength of λ = 477 nm (TGPF101). As a result of optical excitation (λ = 976 nm) of the produced optical fibre, an additional emission line, which was not noticed in the glass, was observed at the wavelength of 351 nm corresponding to the 1D23H6 transition.
DOI: 10.12693/APhysPolA.120.776
PACS numbers: 42.81.-i, 42.79.Ag, 33.20.Kf, 42.25.Bs