Abstract
Gallium-lanthanum-sulphide (GLS) chalcogenide glass doped with dysprosium (Dy3+) shows promise as 1.3 μm fibre-optic amplifier and mid-infrared laser material. GLS glass has attracted great interest due to its low phonon energy of ~ 425 cm-1, resulting in low non-radiative decay rates of rare-earth ions. Its high refractive index of 2.4 results in high radiative emission rates. Both properties improve the radiative quantum efficiencies for all transitions.
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