Analysis of upconversion luminescence in germanate glass and optical fiber codoped with Yb3+/Tb3+

摘要

In this paper, upconversion (UC) luminescence processes in a GeO2 - Ga2O3 - BaO glass system codoped with 0.7Yb(2)O(3)/(0.07 - 0.7)Tb2O3 (mol.%) and double-clad optical fiber codoped with 0.7Yb(2)O(3)/0.7Tb(2)O(3) (mol.%) were investigated. The highest emission intensity (energy transfer efficiency equals 12.92%) was obtained for 0.7Yb(2)O(3)/0.7Tb(2)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 D-5(4) sublevel the main green UC peak (Tb3+ : D-5(4) -> F-7(5)) of fabricated double-clad optical fiber is shifted by 4 nm toward longer wavelengths. (C) 2016 Optical Society of America