Efficient Highly Ytterbium-Doped Silica Fibers with Low Photo-darkening for High Power Fiber Lasers

摘要

Ytterbium-doped phosphosilicate fibers with phosphate-like characteristics, lifetime and doping-levels are demonstrated, offering significantly increased peak powers from shorter fiber amplifiers. Efficient fibers with up to 4700dB/m peak absorption at 976nm, gain of 4.6dB/cm and low photo-darkening are demonstrated. The refractive index of the doped glass can also be tailored to match that of silica, which makes it especially attractive to large core fiber designs.