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Proceedings Paper

Full vectorial finite-element simulations of Bragg fibers for single-mode beam delivery systems
Author(s): Moritz M. Vogel; Marwan Abdou-Ahmed; Andreas Voß; Daniela Kauffmann; Thomas Graf
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Paper Abstract

With the help of a newly implemented circular perfectly matched layer for complex coordinate stretching a fast and accurate calculation of radiation losses of optical waveguides is reported in the present contribution. We will show the results of a fully vectorial finite-element calculation used for the design of special fibers for highpower high-brilliance beam delivery. In particular, we have investigated the propagation losses in the so-called hollow-core and solid-core Bragg-type fibers. These optical fibers have claddings consisting of alternating high and low index layers and offer an asymptotically single-mode behavior even for large core sizes. In the case of the hollow-core Bragg fibers, the preferred mode is a non-degenerated azimuthally polarized doughnut mode (TE01) because it experiences the lowest losses, whereas for the solid-core Bragg fiber a two fold degenerated linearly polarized mode (LP01) experiences the lowest losses. We will describe how to design Bragg fibers for minimal propagation losses and how to reduce the bending sensitivity of these structures. Combining high mode-field diameter with low losses and a low bending sensitivity makes these fibers suitable for high-power single-mode beam delivery systems.

Paper Details

Date Published: 16 April 2008
PDF: 10 pages
Proc. SPIE 6998, Solid State Lasers and Amplifiers III, 69980K (16 April 2008); doi: 10.1117/12.780425
Show Author Affiliations
Moritz M. Vogel, Univ. Stuttgart (Germany)
Marwan Abdou-Ahmed, Univ. Stuttgart (Germany)
Andreas Voß, Univ. Stuttgart (Germany)
Daniela Kauffmann, 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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