We report a high-power, few-cycle mid-infrared (mid-IR) pulse delivery system via the Anti-Resonant Hollow-Core Fiber (AR-HCF). The fiber has a flat transmission window ranging from 1900 nm to 4100 nm, with loss values of ~62 dB/km at 2.8 μm and ~70 dB/km at 3.5 μm. The hollow-core fiber was tightly sealed at both ends using gas units, and in the experiment the hollow-core area of the fiber was vacuumized to avoid additional loss from water absorption of the ambient air. The transmitted mid-IR light, covering a wavelength span of 2.5-3.2 μm, was generated from a three-stage ultrafast fiber laser system, which can deliver few-cycle (~60 fs) pulse train at a repetition rate of 27.9 MHz and an average power of ~235 mW. The coupling efficiency into the hollow-core fiber was measured to be ~86%, and the output average power after 5-meter-long AR-HCF transmission was measured to be 117 mW, giving rise to a total transmission efficiency of ~47%. The few-cycle mid-IR pulse was stretched to ~497 fs duration within the AR-HCF due to waveguide dispersion.
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