Within the EKOLAS consortium, which is part of the BmBF-funded Effilas (Efficient high-performance laser beam sources) research alliance, we are developing Fiber Bragg Gratings (FBGs) written in extra-large mode area (XLMA) fibers. By using FBGs as fiber integrated output mirrors, which is state-of-the-art in single-mode fiber lasers, we aim to reduce complexity and increase robustness and reliability of multi-mode fiber resonators. To this end, we are investigating the use of FBGs as outcoupling mirrors with a reflectivity below 10 % in XLMA high-power multi-mode fiber lasers. As a first step, FBGs are written into a passive 105/125 μm multi-mode fiber. We present their application for frequency stabilization of a resonator based on XLMA fibers, and tested the FBGs up to an output power of 150 W at 1075 nm without failure. As the next step, transition from passive 105/125 μm fibers to active XLMA fibers is currently being investigated. For FBG inscription, we use a phase mask and an ultra-fast laser system (100 fs, 800 nm). The setup is adjustable in three translation and three rotation axes. Additionally it features a modular mechanical design for fast and flexible interchanging of fiber mounts, phase mask and process optics. The FBGs are pre-characterized in transmission with a white-light source and an optical spectrum analyzer.


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    Titel :

    Investigation of fiber Bragg gratings for high-power multi-mode XLMA-based fiber lasers


    Beteiligte:
    Klein, S. (Autor:in) / Fitzau, O. (Autor:in) / Giesberts, M. (Autor:in) / Traub, M. (Autor:in) / Hoffmann, H.-D. (Autor:in) / Krause, V. (Autor:in) / Rehmann, G. (Autor:in)

    Kongress:

    Fiber Lasers XVI: Technology and Systems ; 2019 ; San Francisco,California,United States


    Erschienen in:

    Proc. SPIE ; 10897


    Erscheinungsdatum :

    2019-03-07





    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



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