Hector, J.R., Brocklesby, W.S. and Hewak, D.W.
Quantum efficiency measurements in oxygen-containing gallium lanthanum sulphide glasses and fibers doped with Pr3+.
IEEE Photonics Technology Letters, 9, (4), . (doi:10.1109/68.559382).
The quantum efficiency of Pr3+ emission at 1.3µm from the 1G4 - 3H5 transition is measured in Gallium Lanthanum Sulphide (GLS) glass containing varying quantities of lanthanum oxide. The variation of quantum efficiency with host composition is described, and the variation of quantum efficiency with pump wavelength in oxide-containing hosts is compared to a model of the effect of the addition of oxygen on the spectroscopy of the Pr ion. Oxide-containing GLS glasses can show quantum efficiencies of up to 84% of that of pure GLS, while retaining considerably better thermal and glass-forming properties. No degradation of quantum efficiency is seen when GLS glass is pulled into fiber form.
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