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Proceedings Paper

Investigation of bending effects on evanescent-field coupled waveguides designed for high-power fundamental-mode delivery systems
Author(s): Daniela Kauffmann; Marwan Abdou Ahmed; Florian Kizhakeparampil; Thomas Rataj; Moritz M. Vogel; Andreas Popp; Andreas Voß; Thomas Graf
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Paper Abstract

The objective of the present work is to develop a fiber suitable for high-power fundamental-mode beam delivery over a useful length for material processing (~100 m). The investigated design is based on evanescent-field coupled waveguides, also called multi-core fibers (MCFs) [6]-[8]. The investigated MCF consists of a hexagonal array of 7 cores in which the fundamental mode, the so-called in-phase supermode, has an effective mode area (Aeff) of 348 μm2 and a numerical aperture (N.A.) of 0.035. We show how the bending-induced losses and the mode-mixing depend on the bending radius and on the structure of the waveguide. The experimental results on the behavior of the near-field and the far-field for different bending radii will also be reported. Additionally, we will show another method to reproduce experimental results with multi-mode fibers supporting few modes where the conventional approach leads to irreproducible results due to the mode-mixing effect.

Paper Details

Date Published: 16 April 2008
PDF: 8 pages
Proc. SPIE 6998, Solid State Lasers and Amplifiers III, 69980M (16 April 2008); doi: 10.1117/12.781062
Show Author Affiliations
Daniela Kauffmann, Univ. Stuttgart (Germany)
Marwan Abdou Ahmed, Univ. Stuttgart (Germany)
Florian Kizhakeparampil, Univ. Stuttgart (Germany)
Thomas Rataj, Univ. Stuttgart (Germany)
Moritz M. Vogel, Univ. Stuttgart (Germany)
Andreas Popp, Univ. Stuttgart (Germany)
Andreas Voß, Univ. Stuttgart (Germany)
Thomas Graf, Univ. Stuttgart (Germany)


Published in SPIE Proceedings Vol. 6998:
Solid State Lasers and Amplifiers III
Jonathan A. Terry; Thomas Graf; Helena Jelínková, Editor(s)

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