Hewak, D.W., Madeiros-Neto, J.A., Samson, B.N., Brown, R.S., Jedrzejewski, K.P., Wang, J., Taylor, E.R., Laming, R.I., Wylangowski, G. and Payne, D.N.
Quantum efficiency of praseodymium-doped Ga:La:S glass for 1.3µm optical fibre amplifiers
IEEE Photonics Technology Letters, 6, (5), . (doi:10.1109/68.285556).
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The gain of Pr3+-doped ZBLAN fibre ampliiers is hindered by a poor quantum efficiency due mainly to a high rate of multiphonon decay. Sulphide-based glasses ameliorate this problem through a higher radiative rate and lower non-radiative rate. In this letter, Pr3+-doped Ga:La:S glass has been evaluated spectroscopically in bulk and fibre form for its quantumefficiency at 1.3 microns. Measurements reveal that absorption bands are broadened and the effective separation between the 1G4 and 3F4 level is reduced compared to ZBLAN glass. Judd-Ofelt analysis and the theory of multiphonon-decay now predict efficiencies of 80%, while 58% is measured. Oxide impurities are shown to play a key role in quenching of the radiative emission.
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