Influence of TiO2 concentration on near-infrared luminescence of Er3 thorn ions in barium gallo- germanate glasses

Erbium (Er)-doped barium gallo-germanate (BGG) glasses modified by TiO2 have been investigated for near-infrared luminescence applications. Luminescence at 1.5 mm asso-ciated to 4I13/2 / 4I15/2 transition of Er3 thorn ions has been examined in function of TiO2 con-centration. Several spectroscopic and near-infrared (NIR) laser parameters for Er3 thorn such as stimulated emission cross-section, luminescence bandwidth and lifetime, quantum effi-ciency, gain bandwidth and figure of merit were determined based on experiments and theoretical calculations using the Judd-Ofelt framework. Our systematic investigations indicate that Er-doped glass with molar ratio GeO2:TiO2 1/4 1:2 shows excellent lumines-cence properties and could be successfully applied to near-infrared broadband optical amplifiers.(c) 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Automated summary

The luminescence properties of erbium-doped barium gallo-germanate glasses modified by titanium dioxide for near-infrared luminescence applications were investigated. The 1.5 mm luminescence associated with the 4I13/2 / 4I15/2 transition of Er3+ ions was examined as a function of TiO2 concentration. Spectroscopic and near-infrared laser parameters were determined, including stimulated emission cross-section, luminescence bandwidth, lifetime, quantum efficiency, gain bandwidth, and figure of merit. The results indicate that Er-doped glasses with a molar ratio of GeO2:TiO2 of 1:2 exhibit excellent luminescence properties and can be applied to near-infrared broadband optical amplifiers successfully.