We present a state-of-the-art compact high-energy mid-infrared (mid-IR) laser system for TW-
level eight-cycle pulses at 7 μm. This system consists of an Er: Tm: Ho: fiber MOPA which
serves as the seeder for a ZGP-based optical parametric chirped pulse amplification
(OPCPA) chain, in addition to a Ho: YLF amplifier which is Tm: fiber pumped. Featuring all-
optical synchronization, the system delivers 260 mJ pump energy at 2052 nm and 16 ps
duration at 100 Hz with a stability of 0.8% rms over 20 min. We show that chirp inversion in …

We present the state of the art of a compact high-energy mid-infrared laser system for TW-
level 8-cycle pulses at 7 um. This system consists of an Er: Tm: Ho: fiber MOPA which serves
as the seeder for a ZGP-based OPCPA chain in addition to a Ho: YLF amplifier which is Tm:
fiber pumped. Featuring all-optical synchronization, the system delivers 260-mJ pump
energy at 2052 nm, 16-ps duration at 100 Hz with a stability of 0.8% rms over 20 min. We
show that chirp inversion in the OPCPA chain leads to excellent energy extraction and aids …