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High-order harmonic generation (HHG) is a coherent interaction process between atoms or molecules and a driving laser field. It can produce ultra-short coherent radiation to reach the soft X-ray region. The application of a two-color laser field for HHG has been a fascinating topic of research since recent developments in laser technology have made it possible to produce laser pulses with variable and controllable amplitudes and phases even in the ultra-short and intense range.In the frame of the time-dependent local density approximation (TDLDA) , when an external field Vext=E(t)x is applied, the changes of dipole moments of Na2 in the x,y,z directions can be described as the following
High-order harmonic generation (HHG) is a coherent interaction process between atoms or molecules and a driving laser field. It can produce ultra-short coherent radiation to reach the soft X-ray region. The application of a two-color laser field for HHG has been a fascinating topic of research since recent developments in laser technology have made it possible to produce laser pulses with variable and controllable amplitudes and phases even in the ultra-short and intense range. In the frame of the time-dependent local density approximation (TDLDA), when an external field Vext = E (t) x is applied, the changes of dipole moments of Na2 in the x, y, z directions can be described as the following