Abstract
Gallium–indium fluoride based glasses are one of the lowest phonon energy hosts for Pr-ion doped fibre amplifiers. However, to date the fabrication of low background loss fibres have been proved difficult. In the present investigation, GaF 3/InF 3 based glasses are prepared under the controlled reactive atmosphere of SF 6, HF and N 2 gas mixture. The devitrification characteristics of glass samples prepared in a range of reactive-atmospheres (RA) have been studied using differential scanning calorimetry. From the isothermal data, the time–temperature–transformation curves have been compared for various reactive-atmosphere processing (RAP) conditions and, the influence of RAP conditions on the glass stability is discussed. Loss in multimode fibres (~135 μm) drawn from the glass rods processed under RAP conditions are compared as a function of processing conditions. The measured loss values are reported in 0.5 to 2.0 μm wavelength regime.
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