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We perform a post-compression of high energy pulses by using optical-fieldionization of low pressure helium gas in a guided geometry. We apply thisapproach to a TW chirped-pulse-amplification based Ti:Sapphire laser chain andshow that spectral broadening can be controlled both with the input pulseenergy and gas pressure. Under optimized conditions, we generate 10 fs pulsesat TW level directly under vacuum and demonstrate a high stability of the postcompressed pulse duration. These high energy post-compressed pulses arethereafter used to perform high harmonic generation in a loose focusinggeometry. The XUV beam is characterized both spatially and spectrally on asingle shot basis and structured continuous XUV spectra are observed.

Post-compression of high energy terawatt-level femtosecond pulses and application to high order harmonic generation