Influence of TiO2 concentration on near-infrared luminescence of Er3+ ions in barium gallo-germanate glasses
Karolina Kowalska, Marta Kuwik, Joanna Pisarska, Magdalena Leśniak, Dominik Dorosz, Marcin Kochanowicz, Jacek Żmojda, Jan Dorosz, Wojciech A. Pisarski
Abstract
Erbium (Er)-doped barium gallo-germanate (BGG) glasses modified by TiO2 have been investigated for near-infrared luminescence applications. Luminescence at 1.5 μm associated to 4I13/2 → 4I15/2 transition of Er3+ ions has been examined in function of TiO2 concentration. Several spectroscopic and near-infrared (NIR) laser parameters for Er3+ such as stimulated emission cross-section, luminescence bandwidth and lifetime, quantum efficiency, 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 = 1:2 shows excellent luminescence properties and could be successfully applied to near-infrared broadband optical amplifiers.