Journal
OPTICA
Volume 1, Issue 4, Pages 233-242Publisher
OPTICAL SOC AMER
DOI: 10.1364/OPTICA.1.000233
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Funding
- German Federal Ministry of Education and Research (BMBF)
- European Research Council (ERC) [617173 ACOPS, 240460 PECS]
- Thuringian Ministry for Economy, Labour and Technology (TMWAT) [2011 FGR 0103]
- European Social Fund (ESF)
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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. (C) 2014 Optical Society of America
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