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Proceedings Paper

Power scaling of a hybrid microstructured Yb-doped fiber amplifier
Author(s): Cody Mart; Benjamin Pulford; Benjamin Ward; Iyad Dajani; Thomas Ehrenreich; Brian Anderson; Khanh Kieu; Tony Sanchez
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Paper Abstract

Hybrid microstructured fibers, utilizing both air holes and high index cladding structures, provide important advantages over conventional fiber including robust fundamental mode operation with large core diameters (>30μm) and spectral filtering (i.e. amplified spontaneous emission and Raman suppression). This work investigates the capabilities of a hybrid fiber designed to suppress stimulated Brillouin scattering (SBS) and modal instability (MI) by characterizing these effects in a counter-pumped amplifier configuration as well as interrogating SBS using a pump-probe Brillouin gain spectrum (BGS) diagnostic suite. The fiber has a 35 μm annularly gain tailored core, the center doped with Yb and the second annulus comprised of un-doped fused silica, designed to optimize gain in the fundamental mode while limiting gain to higher order modes. A narrow-linewidth seed was amplified to an MI-limited 820 W, with near-diffraction-limited beam quality, an effective linewidth ~ 1 GHz, and a pump conversion efficiency of 78%. Via a BGS pump-probe measurement system a high resolution spectra and corresponding gain coefficient were obtained. The primary gain peak, corresponding to the Yb doped region of the core, occurred at 15.9 GHz and had a gain coefficient of 1.92×10-11 m/W. A much weaker BGS response, due to the pure silica annulus, occurred at 16.3 GHz. This result demonstrates the feasibility of power scaling hybrid microstructured fiber amplifiers

Paper Details

Date Published: 22 February 2017
PDF: 7 pages
Proc. SPIE 10083, Fiber Lasers XIV: Technology and Systems, 100830X (22 February 2017); doi: 10.1117/12.2249863
Show Author Affiliations
Cody Mart, Air Force Research Lab. (United States)
College of Optical Sciences, The Univ. of Arizona (United States)
Benjamin Pulford, Air Force Research Lab. (United States)
Benjamin Ward, U.S. Air Force Academy (United States)
Iyad Dajani, Air Force Research Lab. (United States)
Thomas Ehrenreich, Air Force Research Lab. (United States)
Brian Anderson, Air Force Research Lab. (United States)
Khanh Kieu, College of Optical Sciences, The Univ. of Arizona (United States)
Tony Sanchez, Air Force Research Lab. (United States)

Published in SPIE Proceedings Vol. 10083:
Fiber Lasers XIV: Technology and Systems
Craig A. Robin; Ingmar Hartl, Editor(s)

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