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We present the state of the art of a compact high-energy mid-infrared lasersystem for TW-level 8-cycle pulses at 7 um. This system consists of anEr:Tm:Ho:fiber MOPA which serves as the seeder for a ZGP-based OPCPA chain inaddition to a Ho:YLF amplifier which is Tm:fiber pumped. Featuring all-opticalsynchronization, the system delivers 260-mJ pump energy at 2052 nm, 16-psduration at 100 Hz with a stability of 0.8 % rms over 20 min. We show thatchirp inversion in the OPCPA chain leads to excellent energy extraction andaids in compression of the 7-um pulses to 8 optical cycles (188 fs) in bulkBaF2 with 93.5 % efficiency. Using 21.7 mJ of the available pump energy, wegenerate 0.75-mJ-energy pulses at 7 um due to increased efficiency with achirp-inversion scheme. The pulse quality of the system's output is shown bygenerating high harmonics in ZnSe which span up to harmonic order 13 withexcellent contrast. The combination of the passive carrier-envelope phasestable mid-infrared seed pulses and the high-energy 2052 nm picosecond pulsesmakes this compact system a key enabling tool for the next generation ofstudies on extreme photonics, strong field physics and table-top coherent X-rayscience.

Table-top high-energy 7 um OPCPA and 260 mJ Ho:YLF pump laser