Single X-Ray Attosecond Pulse Generation by Using Combined Pulses Irradiating on a United Two-Atom System

A scheme of a single x-ray attosecond pulse generation from a two-atom system exposed to the combined laser pulses is proposed. Our numerical results show that a single x-ray attosecond pulse rather than a train one can be produced by modulation of ionization. Furthermore, when we change the peak intensity I_h of the high-frequency pulse and keep the intensity of the low-frequency pulse constant, we can find that a range of I_h where the intensity of the attosecond pulse is optimal is available, and a explanation by the stimulated property of the recombination is also presented.