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15 February 2012 Highly efficient high power single-mode fiber amplifier utilizing the distributed mode filtering bandgap rod fiber
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Abstract
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.
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Marko Laurila, Thomas T. Alkeskjold, Mette M. Jørgensen, Sidsel R. Petersen, Jes Broeng, and Jesper Lægsgaard "Highly efficient high power single-mode fiber amplifier utilizing the distributed mode filtering bandgap rod fiber", Proc. SPIE 8237, Fiber Lasers IX: Technology, Systems, and Applications, 823710 (15 February 2012); https://doi.org/10.1117/12.907736
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