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Advancing ultrafast high-repetition-rate lasers to shortest pulse durationscomprising only a few optical cycles while pushing their energy into themulti-millijoule regime opens a route towards terawatt-class peak powers atunprecedented average power. We explore this route via efficientpost-compression of high-energy 1.2 ps pulses from an Ytterbium InnoSlab laserto 9.6 fs duration using gas-filled multi-pass cells (MPCs) at a repetitionrate of 1 kHz. Employing dual-stage compression with a second MPC stagesupporting a close-to-octave-spanning bandwidth enabled by dispersion-matcheddielectric mirrors, a record compression factor of 125 is reached at 70%overall efficiency, delivering 6.7 mJ pulses with a peak power of about 0.3 TW.Moreover, we show that post-compression can improve the temporal contrast atpicosecond delay by at least one order of magnitude. Our results demonstrateefficient conversion of multi-millijoule picosecond lasers to high-peak-powerfew-cycle sources, opening up new parameter regimes for laser plasma physics,high energy physics, biomedicine and attosecond science.

Post-compression of multi-mJ picosecond pulses to few-cycles approaching the terawatt regime