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Proceedings Paper

Bending behaviors of all-solid silica large mode area Bragg fibers
Author(s): Catherine Baskiotis; Denis Molin; Géraud Bouwmans; Frans Gooijer; Pierre Sillard; Yves Quiquempois; Marc Douay
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Paper Abstract

Fibers used for high power delivery are designed to ensure single-mode operation (in order to guarantee good output beam quality), large effective areas (Aeff) and resistance to bend-induced distortions (in order to avoid non-linear effects). For simple step index fibers, the maximum Aeff of the fundamental mode that can practically be achieved at 1.06μm is ~350μm2. All-solid-silica Bragg fibers with large cores were proposed as an alternative solution for high power delivery through their fundamental core mode. These fibers consist of a low-refractive index core surrounded by a multilayer cladding that acts as a Bragg mirror. The loss spectrum of such fibers consists of a concatenation of several transmission windows separated by high-loss peaks. Here, we simultaneously study, for the first time (at our knowledge), the bending impact on Bragg fibers for the three critical properties required for high power delivery: large Aeff, single-mode propagation and low bend losses for the fundamental mode. Thanks to their specific guiding mechanism, Aeff as large as ~500μm2 at 1.06μm can be achieved in Bragg fibers, while maintaining single-mode operation and bend losses lower than 0.1dB/m. Our numerical results are validated by experimental measurements on a PCVD Bragg fiber with a 40μm diameter core.

Paper Details

Date Published: 19 February 2009
PDF: 9 pages
Proc. SPIE 7195, Fiber Lasers VI: Technology, Systems, and Applications, 719520 (19 February 2009); doi: 10.1117/12.809089
Show Author Affiliations
Catherine Baskiotis, Univ. des Sciences et Technologies de Lille (France)
Denis Molin, Draka (France)
Géraud Bouwmans, Univ. des Sciences et Technologies de Lille (France)
Frans Gooijer, Draka (Netherlands)
Pierre Sillard, Draka (France)
Yves Quiquempois, Univ. des Sciences et Technologies de Lille (France)
Marc Douay, Univ. des Sciences et Technologies de Lille (France)

Published in SPIE Proceedings Vol. 7195:
Fiber Lasers VI: Technology, Systems, and Applications
Denis V. Gapontsev; Dahv A. Kliner; Jay W. Dawson; Kanishka Tankala, Editor(s)

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