Abstract
Summary form only given. In the paper the spectroscopic properties of antimony-silicate-germanate glass and optical fiber co-doped with Yb3+/Ho3+ has been investigated. Upconversion luminescence at the wavelengths of 547 nm (5S2 (5F4) → 5I8) and 659 nm (5F5 → 5I8) in holmium ion was obtained as a result of phonon assisted energy transfer between Yb3+ and Ho3+ ions . Elaborated glass characterized by highest intensity of upconversion luminescence (1mol% Yb2O3/0.5mol% Ho2O3) was used as core of double-clad, off-set core optical fiber. In conventional double-clad optical fibers, only the meridional rays can be absorbed in inner cladding. Offset the core from the center of the inner cladding enables to improve efficiency of optical pumping of the double-clad optical fiber. Basic parameters of the manufactured optical fiber were as follows: outer cladding diameter=400 μm, core diameter=15μm, NAcladding=0.58, NAcore=0.4.
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