The geometry mismatch between active and passive fibers and particularly the presence of a pedestal around the core of active fibers creates a light coupling from this pedestal to the cladding of the passive fiber when spliced together. This signal light propagating in the cladding can results in a beam degradation that reduces the laser performances. We proposed a new solution consisting in using a perfectly matched couple of fibers by adding a pedestal around the core of the passive fiber. This pedestal maintains the coupling light in a quasi-single-mode pedestal area that will not lead to any power losses and not degrade the output beam.
Thanks to a high atmospheric transmission, 2 μm fiber lasers offer unique benefits for both civil and military applications, such as LIDAR, laser weapons or optical countermeasures. All-fibered sources are of particular interest since they allow compact, robust and alignment-free systems. Furthermore, they are well-suitable for power upscaling thanks to a good thermal dissipation. We present in this contribution the recent results achieved on 2 μm fiber lasers and fibered components allowing all-fibered architectures. In particular, the power upscaling up to 500 W-class and the efficiency of Tm3+ -doped and Tm3+, Ho3+ -codoped fiber lasers are discussed.
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