Abstract
We present a state-of-the-art compact high-energy mid-infrared (mid-IR) laser system for TW-level eight-cycle pulses at 7μm. 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 260mJ pump energy at 2052nm and 16ps duration at 100Hz with a stability of 0.8% rms over 20min. We show that chirp inversion in the OPCPA chain leads to excellent energy extraction and aids in compression of the 7μm pulses to eight optical cycles (188fs) in bulk BaF2 with 93.5% efficiency. Using 21.7mJ of the available pump energy, we generate 0.75mJ energy pulses at 7μm due to increased efficiency with a chirp inversion scheme. The pulse quality of the system's output is shown by generating high harmonics in ZnSe which span up to harmonic order 13 with excellent contrast. The combination of the passive carrier-envelope phase stable mid-IR seed pulses and the high-energy 2052nm picosecond pulses makes this compact system a key enabling tool for the next generation of studies on extreme photonics, strong field physics, and table-top coherent X-ray science.
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