ИСТИНА

We present the results of the theoretical study of high-order harmonic generation (HHG) in atomic gases. The traditional methods of control over nonlinear transformation efficiency are usually based on the use of pulse trains, where the parameters of pulses in train (intensity, energy, duration, envelope temporal profile, and carrier-envelope phase) are usually varied to get the desired HHG spectrum profile. We show that the efficiency of the above methods can be sufficiently enhanced by varying the polarization state of the individual pulses in the pulse train. The numerical simulations are based on the specific theoretical approach, in frame of which the polarization state of the integral laser field can vary arbitrary in time. The results of the computer simulations show that the significant enhancement in the intensity of XUV emission can be obtained.