Schematic plotting of the geometry of the laser-plasma interaction.
The time-dependent ellipticity of driving laser pulse in the direction.
The high-order harmonic spectra generated by the driving laser pulse with different CEPs: (a) and (b) . Insets of panels (a) and (b) show the corresponding spectra in the log-log scale. [(c) and (d)] The temporal profiles of the filtered harmonic spectra with and , respectively.
Time-frequency diagrams of the reflected laser pulse with (a) and (b) .
The time-varying electron distributions of synthesized laser pulse with different CEPs: (a) and (c) . It can be seen that the plasma surface motions in (a) and (c) have the same envelope. The zoomed in regions of spikes of (a) and (c) are shown, respectively, in (b) and (d).
The curves of the synthesized driving laser pulse with different CEPs: (blue solid line) and (green dashed line).
The harmonic spectrum of synthesized laser pulse is modulated stronger and stronger with the CEP decreasing from to 0 as shown in (a)–(d), and (e) is the harmonic spectrum when the value of the CEP is . Attosecond pulses in the direction generated by synthesized driving laser pulse with different CEPs: (f) , (g) , (h) , (i) , and (j) .
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