CO2-laser-ablation-assisted fabrication of signal-pump combiners with chirally coupled core fibers for co- and counter-pumped all-fiber amplifiers

verfasst von

Eike Brockmueller, Felix Wellmann, Daniel Lutscher, Ossi Kimmelma, Tyson Lowder, Steffen Novotny, Roland Lachmayer, Jörg Neumann, Dietmar Kracht

Abstract

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 CO2-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 S2-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.

Organisationseinheit(en)

Institut für Produktentwicklung und Gerätebau

Externe Organisation(en)

Laser Zentrum Hannover e.V. (LZH)
nLIGHT Corporation, Lohja
nLIGHT

Typ

Artikel

Journal

Optics express

Band

30

Seiten

25946-25957

Anzahl der Seiten

12

ISSN

1094-4087

Publikationsdatum

18.07.2022

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Atom- und Molekularphysik sowie Optik

Elektronische Version(en)

https://doi.org/10.1364/OE.455606 (Zugang: Offen)