Journal
OPTICS EXPRESS
Volume 15, Issue 10, Pages 6464-6469Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.15.006464
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We propose an original nonlinear beam cleaning fiber laser architecture to obtain high energy pulses with a good beam quality and a narrow linewidth. The output beam of a large core Er:Yb co-doped multimode fiber amplifier (M(2 similar to)6, 220 mu J) is converted into a near diffraction limited beam (M-2=1.6) through a stimulated Brillouin scattering injection seeded beam cleanup process. We report in this experiment a multimode to single mode conversion efficiency of 50% while preserving the master oscillator linewidth. (C) 2007 Optical Society of America
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