Journal
OPTICS EXPRESS
Volume 21, Issue 5, Pages 5456-5462Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.21.005456
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A 170 W all-fiber linearly-polarized single-frequency sing-mode ytterbium amplifier at 1064 nm with an optical efficiency of 80% is demonstrated. 3.9 m long ytterbium-doped polarization maintaining fiber with a core diameter of 10 mu m is used as the gain fiber, which guarantees a diffraction-limited output with a measured M-2 of 1.02. To suppress the stimulated Brillouin scattering, longitudinally varied strains are applied on the gain fiber according to the signal power evolution and the temperature distribution. 7 times increase of the stimulated Brillouin scattering threshold is achieved. (C) 2013 Optical Society of America
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