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

Alexandre Barnini; Kilian Le Corre; Louanne Kervella; Thierry Robin; Pascal Guitton; Mathieu Laroche; Sylvain Girard

doi:10.1117/12.2545917

3 March 2020 Low numerical aperature large-mode-area neodymium-doped fibers fabricated by SPCVD and ASD for laser operation near 920nm

Alexandre Barnini, Kilian Le Corre, Louanne Kervella, Thierry Robin, Pascal Guitton, Mathieu Laroche, Sylvain Girard

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Proceedings Volume 11276, Optical Components and Materials XVII; 112760L (2020) https://doi.org/10.1117/12.2545917
Event: SPIE OPTO, 2020, San Francisco, California, United States

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.

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Alexandre Barnini, Kilian Le Corre, Louanne Kervella, Thierry Robin, Pascal Guitton, Mathieu Laroche, and Sylvain Girard "Low numerical aperature large-mode-area neodymium-doped fibers fabricated by SPCVD and ASD for laser operation near 920nm", Proc. SPIE 11276, Optical Components and Materials XVII, 112760L (3 March 2020); https://doi.org/10.1117/12.2545917

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