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A carrier envelope phase stable near-single cycle mid-infrared laser based onoptical parametric chirped pulse amplification and hollow-core-fibercompression is demonstrated. 4 {\mu}m laser pulses with 11.8 mJ energy aredelivered from a KTA based OPCPA with 100 Hz repetition rate, and compressed tobe ~105 fs by a two-grating compressor with efficiency over 50%. Subsequently,the pulse spectrum is broadened by employing a krypton gas-filledhollow-core-fiber (HCF). Then, the pulse duration is further compressed to 21.5fs through a CaF2 bulk material with energy of 2.6 mJ and stability of 0.9%RMS, which is about 1.6 cycle for 4 {\mu}m laser pulse. The near-single cycle 4{\mu}m laser pulse CEP is passively stabilized with ~370 mrad based on a CEPstable 4 {\mu}m OPA injection.

2.6mJ/100Hz CEP stable near-single-cycle 4{\mu}m laser based on OPCPA and hollow-core-fiber compression