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Proceedings Paper

Top hat single-mode polarization maintaining fiber and polarizing numerical design
Author(s): Pierre Gouriou; Florent Scol; Benoit Sevigny; Constance Valentin; Yves Quiquempois; Laurent Bigot; Rémi Habert; Andy Cassez; Olivier Vanvincq; Emmanuel Hugonnot; Geraud Bouwmans
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Paper Abstract

Compactness, long term stability and no free-space alignment are important advantages of fiber lasers over bulky systems. These fiber lasers have also demonstrated their capability to deliver high-power pulses and are thus suitable for numerous applications. Nevertheless the intensity profile delivered usually has a Gaussian-like shape, which most of the time is sufficient, but it could be interesting, for many applications (laser-biological tissues interactions, heat treatment, industrial laser processing or for seeding large-scale laser facilities like Laser MegaJoule) to obtain a homogeneous intensity profile at the fiber laser output. Moreover several of these applications required a linearly polarized output beam. In order to achieve all these requirements we have developed and realized a new fiber design. This fiber is the first polarization maintaining single-mode fiber delivering a flat top intensity. A high quality flat mode was obtained at 1.05μm through the use of a well-tailored index profile and single-mode behavior was verified by shifting the injection and using the S² imaging. Moreover, boron Stress Applying Parts (SAPs) including in the cladding led to a birefringence of 0.6x10-4 and a measured PER better than 20dB even for a long fiber length (~20 m). Alongside the fabrication, we developed a simulation code, using Comsol Multiphysics®, to take into account the stress dependency induced by the SAPs. Further modeling allows us to present an effectively single-mode fiber design, delivering a top-hat mode profile and exhibiting a polarizing behavior.

Paper Details

Date Published: 11 March 2016
PDF: 7 pages
Proc. SPIE 9728, Fiber Lasers XIII: Technology, Systems, and Applications, 97281A (11 March 2016); doi: 10.1117/12.2209521
Show Author Affiliations
Pierre Gouriou, Commissariat à l'Énergie Atomique et aux Énergies Alternatives (France)
Univ. Lille (France)
Florent Scol, Commissariat à l'Énergie Atomique et aux Énergies Alternatives (France)
Univ. Lille (France)
Benoit Sevigny, Univ. Lille (France)
Constance Valentin, Univ. Lille (France)
Yves Quiquempois, Univ. Lille (France)
Laurent Bigot, Univ. Lille (France)
Rémi Habert, Univ. Lille (France)
Andy Cassez, Univ. Lille (France)
Olivier Vanvincq, Univ. Lille (France)
Emmanuel Hugonnot, Commissariat à l'Énergie Atomique (France)
Geraud Bouwmans, Univ. Lille (France)

Published in SPIE Proceedings Vol. 9728:
Fiber Lasers XIII: Technology, Systems, and Applications
John Ballato, Editor(s)

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