The High-Order Harmonic Generation from Atom Driven by Co-Rotating Laser Pulses Composed of Fundamental Frequency and High Frequency

By numerically solving the time-dependent Schrödinger equation (TDSE), harmonic generation process of atoms irradiated by corotating laser pulses composed a fundamental-frequency and high-frequency field is systematically studied. Compared with generated from counter-rotating two-color circularly polarized pulses, efficiency co-rotating (CRTCCP) same parameters higher. The harmonics are multiphoton radiation transition after bound electrons undergo absorption to higher energy level. In addition, variation strength different frequency components in driving pulse also intensity can be obtained optimizing field.