Journal
OPTICS LETTERS
Volume 32, Issue 9, Pages 1047-1049Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.32.001047
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We demonstrate passive combination of multiple beams in an optical fiber via stimulated Brillouin scattering (SBS). Four off-axis beams are combined in a long multimode optical fiber using a novel all-optical mount. The combined beam has the high spatial coherence properties of the LP01 mode owing to the beam cleanup properties of SBS. The threshold for SBS when off-axis pumps are used is shown to be a factor of 13 times higher than for on-axis pump beams. We propose this method would improve the brightness of an array of fiber amplifiers. (c) 2007 Optical Society of America.
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