Brocklesby, W.S., Townsend, J.E., Brinck, D.J. and Brown, R.S.
Non-radiative relaxation in Ta-doped silica fibres
Optical Materials, 3, (3), . (doi:10.1016/0925-3467(94)90005-1).
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We describe the properties of tantalum-doped silica fibers which have been doped with thulium and produced by a normal solution doping technique. In silica fibers, non-radiative decay almost quenches luminescence from several of the Tm levels, notably the 3F4 level at 800 nm, and the 1H4 level at 2µm. The properties of these levels are a sensitive test of multiphonon decay rates in the host. We observe fluorescence decay components from these levels in Tm-doped tantalosilicate fibers which are significantly longer than those observed in Tm-doped germanosilicate or aluminosilicate fibers. This is interpreted as the formation of a low-vibrational-energy microenvironment around the rare earth.
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