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Proceedings Paper

Low numerical aperature large-mode-area neodymium-doped fibers fabricated by SPCVD and ASD for laser operation near 920nm
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Paper Abstract

We present the fabrication by Surface Plasma Chemical Vapor Deposition (SPCVD) and All Solution Doping (ASD) of step-index Nd-doped fibers with a 30/125μm (core/cladding diameters) geometry and a low numerical aperture (NA) near 0.05. A phospho-alumino-silicate (SiO2-Al2O3-P2O5-Nd2O3) core composition was used to reduce the formation of Nd3+ ions clusters while keeping a low refractive index through the peculiar AlPO4 chemical complex. Operated in CW laser regime, a 0.053 NA fiber generated up to 17W of output power at 921nm, limited by the available pump power at 808nm (51W), yielding a 37% power conversion efficiency. The profile of the output beam for a bend diameter of ~12cm is gaussian and nearly diffraction limited (M2 ~1.1). This is in good agreement with the large discrepancy, in terms of calculated bending losses, between the fundamental LP01 and the higher order modes.

Paper Details

Date Published: 3 March 2020
PDF: 10 pages
Proc. SPIE 11276, Optical Components and Materials XVII, 112760L (3 March 2020); doi: 10.1117/12.2545917
Show Author Affiliations
Alexandre Barnini, iXblue Photonics (France)
Kilian Le Corre, iXblue Photonics (France)
Ctr. de Recherche sur les Ions, les Matériaux et la Photonique (France)
Louanne Kervella, iXblue Photonics (France)
Thierry Robin, iXblue Photonics (France)
Pascal Guitton, iXblue Photonics (France)
Mathieu Laroche, Ctr. de Recherche sur les Ions, les Matériaux et la Photonique (France)
Sylvain Girard, Ctr. de Recherche sur les Ions, les Matériaux et la Photonique (France)

Published in SPIE Proceedings Vol. 11276:
Optical Components and Materials XVII
Shibin Jiang; Michel J. F. Digonnet, Editor(s)

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