Abstract
We propose a new method to control the mode combination at the output of a 19-core fiber laser in order to produce a bright beam with uniform phase. The technique is based on both the selective excitation of the amplifying multicore fiber and on an intra-cavity angular filtering at the output. The excitation of the fundamental in-phase supermode of the 19-core fiber was demonstrated, resulting in the emission of a single-mode beam with M 2 limited to 1.21.
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Shalaby, B.M., Kermène, V., Pagnoux, D. et al. 19-cores Yb-fiber laser with mode selection for improved beam brightness. Appl. Phys. B 100, 859–864 (2010). https://doi.org/10.1007/s00340-010-4048-0
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DOI: https://doi.org/10.1007/s00340-010-4048-0