24 fs and 3 nJ pulse generation from a simple, all polarization maintaining Er-doped fiber laser

We report the generation of 24 fs-short optical pulses from an ultra-simple Er-doped fiber laser system. The design comprises a graphene-based oscillator and an integrated amplifier, which boosts the pulse energy up to 3 nJ and 135 mW of average power. The whole system consists of only three fiber-optic components and two types of fibers. It is based on polarization maintaining fibers, which ensures linear polarization of the output pulses and turn-key, stable operation