Abstract With the combination of the time and space waveform optimization method, the optimal waveforms of the positive and negative inhomogeneous 3-color laser pulse have been found to produce the… Click to show full abstract
Abstract With the combination of the time and space waveform optimization method, the optimal waveforms of the positive and negative inhomogeneous 3-color laser pulse have been found to produce the high order harmonic spectra. The results have been explained by the time-space profiles of the laser pulse and the time-profile of the harmonic emission process. Finally, the ultrashort isolated 40 as pulses can be obtained when the harmonics are properly superposed.
               
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