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

Proceedings of SPIE - The International Society for Optical Engineering, ISSN: 1996-756X, Vol: 11276
2020
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Conference Paper Description

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 (SiO-AlO-PO-NdO) core composition was used to reduce the formation of Nd ions clusters while keeping a low refractive index through the peculiar AlPO 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 (M ∼1.1). This is in good agreement with the large discrepancy, in terms of calculated bending losses, between the fundamental LP and the higher order modes.

Bibliographic Details

Alexandre Barnini; Kilian Le Corre; Louanne Kervella; Thierry Robin; Pascal Guitton; Mathieu Laroche; Sylvain Girard; Michel J. Digonnet; Shibin Jiang

SPIE-Intl Soc Optical Eng

Materials Science; Physics and Astronomy; Computer Science; Mathematics; Engineering

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