Abstract
High power fiber laser is of importance for a wide range of scientific and industrial processes but the transmission distance is till restricted because of stimulated Raman scattering (SRS). We research here on the mitigation of the SRS in highpower fiber laser systems by long period fiber gratings (LPFGs) for longer laser delivery distance. A broadband and high attenuation LPFG is carefully designed and fabricated by a CO2 based inscription system. It has been proven effective in extending delivery distance due to its filtering effect of Raman signal.
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