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Improved Delocalization of Higher-Order Modes in Large-Pitch Fibers by Breaking the Symmetry

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Large-pitch fibers have enabled many current records of average power, pulse energy and pulse peak power in ultra-fast fiber laser systems with very large mode-field diameters (>50 µm). We present an enhanced fiber design with lower symmetry which results in very high mode discrimination. This structure has been obtained by translating the non-symmetric characteristics of spiral geometries into a hexagonal lattice.

© 2013 Optical Society of America

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