Towards large-mode-area fibers fabricated by the full vapor-phase SPCVD process

Alexandre Barnini; Thierry Robin; Daniel Caurant; Thierry Gotter; Gérard Aka; Cédric Guyon; Pascal Guitton; Ronan Montron; Arnaud Laurent; Carine Ranger

doi:10.1117/12.2290219

22 February 2018 Towards large-mode-area fibers fabricated by the full vapor-phase SPCVD process

Alexandre Barnini, Thierry Robin, Daniel Caurant, Thierry Gotter, Gérard Aka, Cédric Guyon, Pascal Guitton, Ronan Montron, Arnaud Laurent, Carine Ranger

Author Affiliations +

Proceedings Volume 10528, Optical Components and Materials XV; 1052814 (2018) https://doi.org/10.1117/12.2290219
Event: SPIE OPTO, 2018, San Francisco, California, United States

Abstract

Large-Mode-Area (LMA) fibers are key elements in modern high power fiber lasers operating at 1 μm. LMA fibers are highly ytterbium-doped and require a fine control of the core refractive index (RI) close to the silica level. These low RI have been achieved with multi-component materials elaborated using a full-vapor phase Surface Plasma Chemical Vapor Deposition (SPCVD) process, enabling the fabrication of large core diameter preforms (up to 4 millimeters). Following the technology demonstration, presented in Photonics West 2017, with results on 10/130 (core-to-clad diameters (in μm) ratio) fibers, this paper aims to present updated results obtained for double-clad 11/130, 20/130 and 20/400 LMA fibers, with numerical apertures at, respectively, 0.08 and 0.065. The study is based on aluminosilicate core material co-doped either with fluorine or phosphorus to achieve optimal radial RI tailoring. The fiber produced exhibit low background losses (<20dB/km at 1100nm) and high power conversion efficiencies, up to 74% for output powers of 100W limited by our test setup. The Gaussian beam quality has been evaluated using the M² measurement. Photodarkening behavior will be discussed for both fluorine and phosphorus-doped aluminosilicate materials and particularly the use of cerium as co-dopant. The SPCVD technology can indeed be used for the production of Yb-doped LMA fibers. Current development is now focused on other rare-earth doped fibers.

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Alexandre Barnini, Thierry Robin, Daniel Caurant, Thierry Gotter, Gérard Aka, Cédric Guyon, Pascal Guitton, Ronan Montron, Arnaud Laurent, and Carine Ranger "Towards large-mode-area fibers fabricated by the full vapor-phase SPCVD process", Proc. SPIE 10528, Optical Components and Materials XV, 1052814 (22 February 2018); https://doi.org/10.1117/12.2290219

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