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High-power fibre laser systems generally rely on microstructured fibres combining an effective single-mode emission and a very large-mode area (V-LMA, Dcore > 50μm). Most of time, the targeted applications (one can cite for instance the frequency conversion [1]) require a crucial control of the state of polarization (SOP) of the emitted beam, leading to the development of polarization-maintaining...
Yb-doped double-cladding photonic crystal fibers are one of the key enabling factors for the development of high-power fiber lasers, due to their capability to provide a very large-mode-area together with the effective suppression of high-order modes, while allowing strong pump absorption and efficient conversion. Thermal effects are currently considered as the main bottleneck for future power scaling;...
This communication intends to summarize the recent strides carried out by the study of original Very Large Mode Area fibers (VLMA) that offer remarkable beam qualities. This work also aims in pushing farther the threshold of appearance for non-linear processes as well as thermal induced beam degradation hindering the power scaling in optical fibers. So as to fulfil this objective, thorough investigations...
The singlemodeness of an all-solid very large mode area fiber, based on an aperiodic cladding microstructuration, is experimentally evidenced. This outstanding ability is confirmed over a large spectral range spanning from 1 to 2 µm.
We report on the study, the fabrication and the characterization of an all-solid Large Pitch Fiber (LPF) made from an innovative synthesis process based on a powder sintering and vitrification. This fiber is actively doped with ytterbium and presents a large core of 50µm.
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