Power scaling of a hybrid microstructured Yb-doped fiber amplifier

Cody Mart, Benjamin Pulford, Benjamin Ward, Iyad Dajani, Thomas Ehrenreich, Brian Anderson, Khanh Kieu, Tony Sanchez

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

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.

Original languageEnglish (US)
Title of host publicationFiber Lasers XIV
Subtitle of host publicationTechnology and Systems
EditorsIngmar Hartl, Craig A. Robin
PublisherSPIE
ISBN (Electronic)9781510606074
DOIs
StatePublished - Jan 1 2017
EventFiber Lasers XIV: Technology and Systems 2017 - San Francisco, United States
Duration: Jan 30 2017Feb 2 2017

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume10083
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Other

OtherFiber Lasers XIV: Technology and Systems 2017
CountryUnited States
CitySan Francisco
Period1/30/172/2/17

Keywords

  • Mode Instability
  • Photonic Bandgap Fiber
  • Photonic Crystal Fiber
  • Stimulated Brillouin Scattering

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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  • Cite this

    Mart, C., Pulford, B., Ward, B., Dajani, I., Ehrenreich, T., Anderson, B., Kieu, K., & Sanchez, T. (2017). Power scaling of a hybrid microstructured Yb-doped fiber amplifier. In I. Hartl, & C. A. Robin (Eds.), Fiber Lasers XIV: Technology and Systems [100830X] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 10083). SPIE. https://doi.org/10.1117/12.2249863