High-power picosecond pulse delivery through hollow core photonic band gap fibers

Mattia Michieletto, Mette Marie Johansen, Jens Kristian Lyngsø, Jesper Lægsgaard, Ole Bang, Thomas T. Alkeskjold

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


We demonstrated robust and bend insensitive fiber delivery of high power laser with diffraction limited beam quality for two different kinds of hollow core band gap fibers. The light source for this experiment consists of ytterbium-doped double clad fiber aeroGAIN-ROD-PM85 in a high power amplifier setup. It provided 22ps pulses with a maximum average power of 95W, 40MHz repetition rate at 1032nm (~2.4μJ pulse energy), with M2 <1.3. We determined the facet damage threshold for a 7-cells hollow core photonic bandgap fiber and showed up to 59W average power output for a 5 meters fiber. The damage threshold for a 19-cell hollow core photonic bandgap fiber exceeded the maximum power provided by the light source and up to 76W average output power was demonstrated for a 1m fiber. In both cases, no special attention was needed to mitigate bend sensitivity. The fibers were coiled on 8 centimeters radius spools and even lower bending radii were present. In addition, stimulated rotational Raman scattering arising from nitrogen molecules was measured through a 42m long 19 cell hollow core fiber. © (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Original languageEnglish
Title of host publicationProceedings of SPIE
Number of pages5
PublisherSPIE - International Society for Optical Engineering
Publication date2016
Publication statusPublished - 2016
EventFiber Lasers XIII: Technology, Systems, and Applications - The Moscone Center, San Francisco, United States
Duration: 13 Feb 201618 Feb 2016
Conference number: 9728


ConferenceFiber Lasers XIII: Technology, Systems, and Applications
LocationThe Moscone Center
CountryUnited States
CitySan Francisco


  • Hollow core fiber
  • Fiber delivery
  • High power

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