Attosecond pulse generation from two-electron harmonic emission spectrum*
Feng Li-Qianga),b)†, Liu Hangc)‡
       
(a) Laser profile of the 5 fs/800 nm, I = 5.0 × 1014 W/cm2 pulse. (b) The SEA recombination energies under the above laser pulse. Time is in units of optical cycle (o.c.) of an 800-nm pulse in all the following figures unless stated otherwise. (c)–(e) Two-electron double recombination schemes with recombination delay time equaling to zero, half laser cycle, and one laser cycle, respectively. (c)  E cutoff = I p1 + I p2 + 2 E HC1, I p1 + I p2 + 2 E HC2, I p1 + I p2 + 2 E HC3. (d)  E cutoff = I p1 + I p2 + E HC2 + E HC1, I p1 + I p2 + E HC3 + E HC2. (e)  E cutoff = I p1 + I p2 + E HC3 + E HC1.