Coherent continuum generation above 100 eV driven by an ir parametric source in a two-color scheme

摘要: High-order harmonics were generated in a two-color scheme exploiting an infrared parametric source with self-stabilization of the carrier-envelope phase. A significant cutoff extension was observed respect to single color, 800 nm driving pulses at comparable peak intensities. Exploiting wavelength tuning $1.5\char21{}1.6\text{ }\ensuremath{\mu}\text{m}$ range, continuous xuv spectrum extending from 36 70 eV krypton. broader continuum, beyond 100 eV, argon. These results represent step forward attosecond science toward soft x-rays region and open new perspectives investigation quantum effects atoms molecules.