Investigation of bending effects on evanescent-field coupled waveguides designed for high-power fundamental-mode delivery systems

Daniela Kauffmann; Marwan Abdou Ahmed; Florian Kizhakeparampil; Thomas Rataj; Moritz M. Vogel; Andreas Popp; Andreas Voß; Thomas Graf

doi:10.1117/12.781062

16 April 2008 Investigation of bending effects on evanescent-field coupled waveguides designed for high-power fundamental-mode delivery systems

Daniela Kauffmann, Marwan Abdou Ahmed, Florian Kizhakeparampil, Thomas Rataj, Moritz M. Vogel, Andreas Popp, Andreas Voß, Thomas Graf

Author Affiliations +

Proceedings Volume 6998, Solid State Lasers and Amplifiers III; 69980M (2008) https://doi.org/10.1117/12.781062
Event: SPIE Photonics Europe, 2008, Strasbourg, France

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 (A_eff) 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.

Citation Download Citation

Daniela Kauffmann, Marwan Abdou Ahmed, Florian Kizhakeparampil, Thomas Rataj, Moritz M. Vogel, Andreas Popp, Andreas Voß, and Thomas Graf "Investigation of bending effects on evanescent-field coupled waveguides designed for high-power fundamental-mode delivery systems", Proc. SPIE 6998, Solid State Lasers and Amplifiers III, 69980M (16 April 2008); https://doi.org/10.1117/12.781062

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