Highly efficient high power single-mode fiber amplifier utilizing the distributed mode filtering bandgap rod fiber

Marko Laurila, Thomas T. Alkeskjold, Mette Marie Jørgensen, Sidsel R. Petersen, Jes Broeng, Jesper Lægsgaard

Research output: Contribution to journalConference articleResearchpeer-review


We report on an ytterbium doped single mode distributed mode filtering rod fiber in an amplifier configuration delivering high average output power, up to 292 watts, using a mode-locked 30ps source at 1032nm with good power conversion efficiency. We study the modal stability of the output beam at high average output power levels and demonstrate a 44% power improvement before the threshold-like onset of mode instabilities by operating the rod fiber in a leaky waveguide regime. We investigate the guiding dynamics of the rod fiber and explain the improved performance by thermally induced refractive index profile change.
Original languageEnglish
JournalProceedings of SPIE, the International Society for Optical Engineering
Issue number1
Pages (from-to)823710
Publication statusPublished - 2012
EventSPIE Photonics West : Fiber Lasers IX: Technology, Systems, and Applications - San Francisco, CA, United States
Duration: 23 Jan 201226 Jan 2012


ConferenceSPIE Photonics West : Fiber Lasers IX: Technology, Systems, and Applications
CountryUnited States
CitySan Francisco, CA


  • Fiber lasers
  • Micro structure fibers

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