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11 March 2016 High-power picosecond pulse delivery through hollow core photonic band gap fibers
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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.
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Mattia Michieletto, Mette M. Johansen, Jens K. Lyngsø, Jesper Lægsgaard, Ole Bang, and Thomas T. Alkeskjold "High-power picosecond pulse delivery through hollow core photonic band gap fibers", Proc. SPIE 9728, Fiber Lasers XIII: Technology, Systems, and Applications, 97282Z (11 March 2016);


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