Femtosecond inscription of large-area fiber Bragg gratings for high-power cladding pump reflection

A new, to the best of our knowledge, method for inscribing fiber Bragg gratings inside a fiber’s cladding based on the motorized rotation of the fiber is reported. By minimizing the aberrations induced by the fiber curvature on the femtosecond writing beam, this technique based on a phase mask allow...

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Veröffentlicht in:Optics letters 2022-10, Vol.47 (19), p.4989-1992
Hauptverfasser: Pelletier-Ouellet, Samantha, Talbot, Lauris, Mailloux, Alain, Trépanier, François, Bernier, Martin
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Sprache:eng
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Zusammenfassung:A new, to the best of our knowledge, method for inscribing fiber Bragg gratings inside a fiber’s cladding based on the motorized rotation of the fiber is reported. By minimizing the aberrations induced by the fiber curvature on the femtosecond writing beam, this technique based on a phase mask allows to cover large transverse areas of a standard high-power fiber’s cladding. With this approach, a first-order Bragg grating was inscribed in the pure-silica inner cladding of a 20/400-µm fiber. It was then implemented as a pump reflector at the end of a 36-m-long Yb-doped fiber laser reaching 600 W of output power, confirming the power handling capabilities of such a component. Comparison of the laser performances with and without the pump reflector showcases its great potential for increasing pump absorption inside cladding-pumped fiber lasers, which paves the way for significantly reducing their active fiber length.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.469636