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International audienceWe demonstrate pulse post-compression of a TW class chirped pulse amplification laser em-ploying a gas-filled planar hollow waveguide. A waveguide throughput of 80% is achieved for 50 mJ input pulse energy. Good focusability is found and after compression with chirped mirrors a pulse duration of sub-15 fs is measured in the beam center. Whereas a total energy efficiency of ≈70% should be achievable, our post-compressor currently delivers 20 mJ output pulse energy (≈40% efficiency), mostly limited by apertures of chirped mirrors and vacuum windows. The viability of the planar hollow waveguide compres-sion scheme for applications in strong-field physics is demonstrated by generating high-order harmonics in a pulsed Ar gas cell

the european physical journal. d, atomic, molecular and optical physics/the european physical journal. d, atomic, molecular, optical and plasma physics

Compression of TW class laser pulses in a planar hollow waveguide for applications in strong-field physics