CO 2 -laser-ablation-assisted fabrication of signal-pump combiners with chirally coupled core fibers for co- and counter-pumped all-fiber amplifiers

We report on the development of a side-fused signal-pump combiner with an integrated feed-through 34/250-µm chirally coupled core fiber. The manufacturing process involves a novel rotationally symmetrical cladding restructuring using a CO 2 -laser beam. The signal-pump combiner exhibits the pump-to-...

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Bibliographic Details
Published in:Optics express 2022-07, Vol.30 (15), p.25946
Main Authors: Brockmüller, Eike, Wellmann, Felix, Lutscher, Daniel, Kimmelma, Ossi, Lowder, Tyson, Novotny, Steffen, Lachmayer, Roland, Neumann, Jörg, Kracht, Dietmar
Format: Article
Language:English
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Summary:We report on the development of a side-fused signal-pump combiner with an integrated feed-through 34/250-µm chirally coupled core fiber. The manufacturing process involves a novel rotationally symmetrical cladding restructuring using a CO 2 -laser beam. The signal-pump combiner exhibits the pump-to-signal fiber coupling efficiency of 90%, signal-to-pump isolation of 30 dB, and is high-power tested at a pump input power of >500 W. Additionally, a signal feed-through loss of 0.23 dB is measured and the S 2 -method is used to confirm non-degradation of the spatial modes. The side-fused combiner technique has the advantage of an uninterrupted signal core and can be used in co- and counter-pumped configurations.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.455606