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Designing advanced very-large-mode-area fibers for power scaling of fiber-laser systems

 
: Stutzki, F.; Jansen, F.; Otto, H.J.; Jauregui, C.; Limpert, J.; Tünnermann, A.

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Fulltext (PDF; )

Optica 1 (2014), No.4, pp.233-242
ISSN: 2334-2536
European Commission EC
FP7-IDEAS-ERC; 617173; ACOPS
European Commission EC
FP7-IDEAS-ERC; 240460; PECS
English
Journal Article, Electronic Publication
Fraunhofer IOF ()

Abstract
Fiber lasers are a highly regarded solid-state laser concept due to their high efficiency, beam quality, and easy thermal management. Unfortunately, the performance of high-power fiber-laser systems is challenged by the onset of detrimental nonlinear effects. Their impact can be reduced dramatically by employing fibers with larger mode-field areas. Even though this is an efficient way to mitigate nonlinear effects, maintaining effective single-mode operation, and with it high beam quality, becomes increasingly difficult as the core is enlarged. In this paper the demands and challenges for the design of a very-large-mode-area (VLMA) fiber are discussed. The benefits of using higher-order mode delocalization as the working principle of active double-clad VLMA fibers are described. Finally, a new low-symmetry large-pitch fiber, which is expected to improve the performance of state-of-the-art fiber-laser systems by increasing higher-order mode delocalization, is proposed and thoroughly analyzed.

: http://publica.fraunhofer.de/documents/N-369892.html