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Proceedings Paper

Highly efficient high power single-mode fiber amplifier utilizing the distributed mode filtering bandgap rod fiber
Author(s): Marko Laurila; Thomas T. Alkeskjold; Mette M. Jørgensen; Sidsel R. Petersen; Jes Broeng; Jesper Lægsgaard
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Paper 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.

Paper Details

Date Published: 15 February 2012
PDF: 9 pages
Proc. SPIE 8237, Fiber Lasers IX: Technology, Systems, and Applications, 823710 (15 February 2012); doi: 10.1117/12.907736
Show Author Affiliations
Marko Laurila, Technical Univ. of Denmark (Denmark)
Thomas T. Alkeskjold, NKT Photonics A/S (Denmark)
Mette M. Jørgensen, NKT Photonics A/S (Denmark)
Sidsel R. Petersen, NKT Photonics A/S (Denmark)
Jes Broeng, NKT Photonics A/S (Denmark)
Jesper Lægsgaard, Technical Univ. of Denmark (Denmark)

Published in SPIE Proceedings Vol. 8237:
Fiber Lasers IX: Technology, Systems, and Applications
Eric C. Honea; Sami T. Hendow, Editor(s)

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