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White Papers

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

January 22, 2007

By: G.P. Frith, B. Samson, A. Carter, J. Farroni, K. Tankala

Presented at Photonics West 2007

Complete text not yet available for download. Please e-mail info@nufern.com

We report a fiber Bragg grating (FBG) based laser, delivering 110W CW at 2µm with 55% slope efficiency from a conductively cooled Tm-doped silica fiber pumped with 200W of 793nm radiation. The laser operates in a single transverse mode at 2050nm (FWHM ~2nm) independent of the operating power; as determined by the peak reflectivity of the FBG. 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.