Fig. 5: HHG single-atom response simulations for argon.
From: Strong-field coherent control of isolated attosecond pulse generation
a Dependence of XUV spectrum on RP between the NIR and IR channels, using a common CEP fixed at π/2. The Lewenstein integral20 considers short trajectories only and is solved using synthesized driving fields EL(t) built upon the combination of the actual NIR and IR channel temporal profiles of the PWS. The synthesized peak intensity was fixed to 2.5 × 1014W/cm2 for RP = 0 and CEP = 0. Linear 1D propagation of the resulting single-atom XUV pulse through the gas target (2 mm, 300 mbar) is implemented. b Lineouts of the XUV spectra at different RP values (corresponding to red, blue and black vertical lines in a) and their corresponding FTL pulse durations. c–e classical electron trajectories (purple) and emitted XUV attosecond bursts (shaded areas) are shown for different optical waveforms (black solid lines) resulting from the RP values indicated in (a). The trajectory color-coding is based on the re-collision energy and the transparency level is based on the ionization rate at the trajectory birth time (see Supplementary Information S5).
