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The aim of this study is the optimisation of Yb doped silica preforms which are used for the realization of high power laser fibres. A spectroscopic study has thus been carried on using a stable setup conducing to quantify in the same time the Yb 3+ emission in the visible and in the infrared spectral ranges. In this way, the impact of the Al ions on the silica solubility as well as the low...
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