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We propose and demonstrate a simple route to few-optical-cycle pulsegeneration from a mid-infrared fiber laser through nonlinear compression ofpulses from a holmium-doped fiber oscillator using a short length ofchalcogenide fiber and a grating pair. Pulses from the oscillator with 265-fsduration at 2.86 {\mu}m are spectrally broadened through self-phase modulationin step-index As2S3 fiber to 141-nm bandwidth and then re-compressed to 70 fs(7.3 optical cycles). These are the shortest pulses from a mid-infrared fibersystem to date, and we note that our system is compact, robust, and uses onlycommercially available components. The scalability of this approach is alsodiscussed, supported by numerical modeling.

Generation of 70-fs pulses at 2.86 {\mu}m from a mid-infrared fiber laser