Abstract

In this paper, upconversion (UC) luminescence processes in a GeO2Ga2O3BaO glass system codoped with 0.7Yb2O3/(0.070.7)Tb2O3 (mol.%) and double-clad optical fiber codoped with 0.7Yb2O3/0.7Tb2O3 (mol.%) were investigated. The highest emission intensity (energy transfer efficiency equals 12.92%) was obtained for 0.7Yb2O3/0.7Tb2O3 codoped glass. Comparative analysis showed significant differences in the shape of luminescence of fabricated germanate glass and optical fiber. Due to dominant transition from D45 sublevel the main green UC peak (Tb3+:  D45F57) of fabricated double-clad optical fiber is shifted by 4 nm toward longer wavelengths.

© 2016 Optical Society of America

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