Broadband infrared fluorescence in Er3+-doped BaO–SiO2 glasses

Er3+-doped SiO2 glasses with or without BaO were fabricated by containerless processing. Scanning electron microscope observations and the scan profiles of electron-probe microanalysis demonstrated that the Ba-silicate glass was homogeneous and no aggregation of Er3+ ions occurred. The infrared fluorescence at around 1.55 μm from Er3+ in the Ba-silicate glass excited by a 980-nm laser was broader and its lifetime was longer than that of the silica glass, indicating the difference in the local structures around Er3+ ions between the Ba-silicate and silica glasses; this was supported by Raman scattering measurements. These results demonstrated that the Ba-silicate-glass system might be a new candidate for a host glass for Er3+-doped fiber amplifiers.

► Er3+-doped BaO–SiO2 glass exhibited broadband fluorescence.
► The effective bandwidth and the lifetime increased by adding Ba+2 ions.
► The electronic dipole transition of the band was small.
► Raman scattering measurements indicated the generation of non-bridging oxygens.