Spectral properties and stability of Er3+-doped TeO2–WO3 glass

Er3+-doped TeO2–WO3 glass was fabricated and characterized by absorption spectrum, fluorescence spectrum, Raman spectrum and stability. The Judd–Ofelt parameter Ωt (t = 2, 4, 6) were calculated from the absorption spectrum by the Judd–Ofelt theory. The fluorescence spectrum indicates that the fluorescence width at half-maximum (FWHM) is 66 nm. The stimulated emission cross-section of Er3+ in TeO2–WO3 glass at 1532 nm was calculated to be 0.80 × 10−20 cm2 by McCumber theory. The phonon energy of TeO2–WO3 glass is found to be 931 cm−1. The difference between crystallization onset temperature and glass transition temperature ΔT is 112 °C. These results show that Er3+-doped TeO2–WO3 glass has higher stability and good spectral properties, which were useful for broadband amplifier.