7 March 2014 Breaking the symmetry for enhanced higher-order mode delocalization
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Large-pitch fibers (LPFs) have enabled the current records for average power, pulse energy and pulse peak power in ultra-fast fiber laser systems. In this paper the working principle of LPFs, which is based on higher-order mode delocalization, is numerically analyzed paying special attention to thermal effects and index mismatch. An enhanced design concept is proposed with a reduced symmetry to improve the delocalization of higher-order modes. This enhanced design has been obtained by transferring the most important characteristics of spiral geometries to a common hexagonal lattice.
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Fabian Stutzki, Fabian Stutzki, Florian Jansen, Florian Jansen, Cesar Jauregui, Cesar Jauregui, Jens Limpert, Jens Limpert, Andreas Tünnermann, Andreas Tünnermann, "Breaking the symmetry for enhanced higher-order mode delocalization", Proc. SPIE 8961, Fiber Lasers XI: Technology, Systems, and Applications, 89611N (7 March 2014); doi: 10.1117/12.2036901; https://doi.org/10.1117/12.2036901

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