High Power (110W), High Efficiency (55%) monolithic FBG based Fiber Laser Operating at 2µm

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This demonstration has been made possible by the recent development of true large mode area (LMA) Tm-doped fibers which employ the use of an up-doped pedestal surrounding the rare earth doped core. High reflectivity fiber gratings were written in a matching photosensitive fiber, spliced to the Tm-doped LMA fiber and an end pumped monolithic laser cavity demonstrated.