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We demonstrate a new regime for mid-infrared optical parametric chirped pulseamplification (OPCPA) based on achromatic quasi-phase-matching. Ourmid-infrared OPCPA system is based on collinear aperiodically poled lithiumniobate (APPLN) pre-amplifiers and a non-collinear PPLN power amplifier. Theidler output has a bandwidth of 800 nm centered at 3.4 $\mu$m. Aftercompression, we obtain a pulse duration of 44.2 fs and a pulse energy of 21.8$\mu$J at a repetition rate of 50 kHz. We explain the wide applicability of thenon-collinear QPM amplification scheme we used, including how it can enableoctave-spanning OPCPA in a single device when combined with an aperiodic QPMgrating.

Mid-infrared pulse generation via achromatic quasi-phase-matched OPCPA