Coherent XUV generation by an IR parametric source: a step towards attosecond pulses at 100 eV

We investigated the generation of XUV high order harmonics in gases by two-color driving pulses, exploiting an infrared parametric source with self-stabilization of the carrier-envelope phase. Continuous XUV spectra were generated, showing a spectral extension beyond 100 eV. These results represent a step forward in the extension of attosecond science towards the soft-X rays region.