All-fiber picoseconds MOPA laser with a narrow spectrum output

摘要

we report an all-fiber picoseconds MOPA laser with a narrow spectrum output in this paper. The repetition rate of the seed source is increased to ～1 GHz with a unique all-fiber device to suppress nonlinear effects, and a small core gain fiber is used in the power amplifier to support the less transverse mode. Three cascaded amplifiers are adopted to amplify the signal light, and the maximum output power is 30 W with an optical conversion efficiency of 73.9%. The 6 dB spectral linewidth just extends from 0.89 nm of the seed to 1.34 nm at the max output.