Abstract

In this paper, upconversion (UC) luminescence processes in a ${\mathrm{GeO}}_2-{\mathrm{Ga}}_2{\mathrm{O}}_3-\mathrm{BaO}$ glass system codoped with $0.7{\mathrm{Yb}}_2{\mathrm{O}}_3/(0.07-0.7){\mathrm{Tb}}_2{\mathrm{O}}_3$ (mol.%) and double-clad optical fiber codoped with $0.7{\mathrm{Yb}}_2{\mathrm{O}}_3/0.7{\mathrm{Tb}}_2{\mathrm{O}}_3$ (mol.%) were investigated. The highest emission intensity (energy transfer efficiency equals 12.92%) was obtained for $0.7{\mathrm{Yb}}_2{\mathrm{O}}_3/0.7{\mathrm{Tb}}_2{\mathrm{O}}_3$ codoped glass. Comparative analysis showed significant differences in the shape of luminescence of fabricated germanate glass and optical fiber. Due to dominant transition from ${}^5{\mathrm{D}}_4$ sublevel the main green UC peak (${\mathrm{Tb}}^{3+}\text{:}{}^5{\mathrm{D}}_4\to {}^7{\mathrm{F}}_5$) of fabricated double-clad optical fiber is shifted by 4 nm toward longer wavelengths.

© 2016 Optical Society of America

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