Fig. 5
(a) Time-dependent vector potential in the framework of the polarization gating method with asymmetric amplitude ratio (\(\:{\text{I}}_{1}=0.50\text{T}\text{W}/{\text{c}\text{m}}^{2},\:{\text{I}}_{2}=0.25\:\text{T}\text{W}/{\text{c}\text{m}}^{2}\)). (b) It shows attosecond pulses for a driving laser pulse intensity range of \(\:{\text{I}}_{1}=0.50\text{T}\text{W}/{\text{c}\text{m}}^{2}\) to \(\:{\text{I}}_{1}=1.50\text{T}\text{W}/{\text{c}\text{m}}^{2}\) with a ratio of \(\:{\text{I}}_{1}/{\text{I}}_{2}=2\). The driving wavelength is fixed at 2.5 \(\:{\upmu\:}\text{m}\). The FWHM of each IAP is shown in the right panel. The intensity of the attosecond pulses is normalized. All IAPs obtained from different driving laser intensities are obtained from the superposition of the 3th to 20th harmonics. The delay factor \(\:\gamma\:\) is taken to be 1.74.
