Single attosecond pulse generation for a dielectric driven by mid-infrared laser field

Abstract

We theoretically investigate the high-order-harmonic generation (HHG) from solids by simulating the dynamics of a single active electron in a dielectric. Interband tunnelling is investigated, by which the harmonic generation can be modeled based on the classical trajectory analysis of electron-hole pairs. The supercontinuum region of the fundamental HHG plateau, whose intensity is about sevenorder magnitude enhancement as compared with that of the second plateau, is used in the generation of isolated attosecond pulses. Thus, it provides us a practical way to increase the conversion efficiency of HHG with laser intensity below the damage threshold.