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Structural, spectroscopic and dielectric properties of thulium-doped laser-heated pedestal Ta 2 O 5 as-grown fibres were studied. Undoped samples grow preferentially with a single crystalline monoclinic structure. The fibre with the lowest thulium content (0.1at%) also shows predominantly a monoclinic phase and no intra-4f 12 Tm 3+ recombination was observed. For sample...
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