Attosecond pulse generation from two-electron harmonic emission spectrum*
Feng Li-Qianga),b)†, Liu Hangc)‡
       
(a) Two-electron (solid black line) and SEA (dash red line) harmonic emission spectra of He atom driven by the two-color field, consisting of the 5 fs/800 nm, I 1 = 5.0 × 1014 W/cm2 pulse and the 10 fs/1600 nm, I 2 = 1.0 × 1014 W/cm2, φ = 0.0 π pulse. (b)–(d) Controlling wavelength, controlling pulse intensity, and relative phase effects on the two-electron harmonic spectra, respectively.