Abstract
The impact of different sodium concentrations on the thermal properties and near-infrared emission at 1540nm of Er3+-doped tellurite glasses was investigated. The glasses were characterized by UV–visible–near-infrared absorption spectroscopy, emission spectroscopy, Raman spectroscopy, refractive index measurements, and lifetime estimates. A theoretical analysis of the prepared samples was performed with the Judd–Ofelt parameters, radiative transition probability, quantum yield, and radiative lifetime. The glasses presented a large calculated emission cross-section at around 1537nm (8.4×10−21cm2) and a good quantum yield (93%). The spectroscopic quality factors (Ω4/Ω6) obtained for the samples showed good agreement with the emission spectrum and bandwidth in the near-infrared region. The advantageous spectroscopic characteristics, together with good thermal stability, indicate that the glasses have potential applications as 1540nm waveguides.
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