4.5 Article

Plasma-based VAD process for multiply doped glass powders and high-performance fiber preforms with outstanding homogeneity

期刊

PLASMA PROCESSES AND POLYMERS
卷 17, 期 12, 页码 -

出版社

WILEY-V C H VERLAG GMBH
DOI: 10.1002/ppap.202000140

关键词

atmospheric pressure; dopant homogeneity; microwave plasma; preform fabrication; silica

资金

  1. European Research Council, ERC [681652]
  2. 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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