The wavelength dependence of high-order harmonic generation and attosecond pulses from atom in infrared laser field
原子在红外激光场中产生高次谐波及阿秒脉冲随波长的变化规律

Basing on the strong-field approximation, we study high harmonic generation of hydrogen atom exposed to the long wavelength infrared laser field, and analyze the wavelength dependence of conversion efficiency of high-order harmonic generation near the cut-off position. It is found that high-order harmonic yield is much lower near cut-off than in the beginning of the plateau of the harmonic generation, but the width of the attosecond pulse is narrowed with increasing wavelength.