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

Marko Laurila; Thomas T. Alkeskjold; Mette M. Jørgensen; Sidsel R. Petersen; Jes Broeng; Jesper Lægsgaard

doi:10.1117/12.907736

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15 February 2012 Highly efficient high power single-mode fiber amplifier utilizing the distributed mode filtering bandgap rod fiber

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

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Proceedings Volume 8237, Fiber Lasers IX: Technology, Systems, and Applications; 823710 (2012) https://doi.org/10.1117/12.907736
Event: SPIE LASE, 2012, San Francisco, California, United States

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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