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- Item8 fs laser pulses from a compact gas-filled multi-pass cell(Washington, DC : Soc., 2021) Rueda, P.; Videla, F.; Witting, T.; Torchia, G.A.; Furch, F.J.Compression of 42 fs, 0.29 mJ pulses from a Ti:Sapphire amplifier down to 8 fs (approximately 3 optical cycles) is demonstrated by means of spectral broadening in a compact multi-pass cell filled with argon. The efficiency of the nonlinear pulse compression is limited to 45 % mostly by losses in the mirrors of the cell. The experimental results are supported by 3-dimensional numerical simulations of the nonlinear pulse propagation in the cell that allow us to study spatio-spectral properties of the pulses after spectral broadening.