中文摘要：

Using a nonperturbative quantum electrodynamics theory of high-order harmonic generation (HHG),a scaling law of HHG is established.The scaling law states that when the atomic binding energy E b,the wavelength λ and the intensity I of the laser field change simultaneously to kE b,λ/k,and k 3 I,respectively.The characteristics of the HHG spectrum remain unchanged,while the harmonic yield is enhanced k 3 times.That HHG obeys the same scaling law with above-threshold ionization is a solid proof of the fact that the two physical processes have similar physical mechanisms.The variation of integrated harmonic yields is also discussed.

英文摘要：

Using a nonperturbative quantum electrodynamics theory of high-order harmonic generation （HHG）, a scaling law of HHG is established. The scaling law states that when the atomic binding energy Eb, the wavelength ）, and the intensity I of the laser field change simultaneously to kEb, λ/k, and k3I, respectively. The characteristics of the HHG spectrum remain unchanged, while the harmonic yield is enhanced k3 times. That HHG obeys the same scaling law with above-threshold ionization is a solid proof of the fact that the two physical processes have similar physical mechanisms. The variation of integrated harmonic yields is also discussed.