Journal
PLASMA PROCESSES AND POLYMERS
Volume 17, Issue 12, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ppap.202000140
Keywords
atmospheric pressure; dopant homogeneity; microwave plasma; preform fabrication; silica
Funding
- European Research Council, ERC [681652]
- Leibniz-Gemeinschaft
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An innovative approach using the vapor axial deposition (VAD), for the preparation of silica-based high-power fiber laser preforms, is described in this study. The VAD uses a plasma deposition system operating at atmospheric pressure, fed by a single, chemically adapted solution containing precursors of laser-active dopants (e.g., Yb2O3), glass-modifier species (e.g., Al2O3), and the silica matrix. The approach enables simultaneous doping with multiple optically active species and overcomes some of the current technological limitations encountered with well-established fiber preform technologies in terms of dopant distribution, doping levels, and achievable active core diameter. The deposition of co-doped silica with outstanding homogeneity is proven by Raman spectroscopy and electron probe microanalysis. Yb(2)O(3 )concentrations are realized up to 0.3 mol% in SiO2, with simultaneous doping of 3 mol% of Al2O3.
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