Abstract

We theoretically investigated the high-order harmonic generation (HHG) from the oriented gas-phase CO molecule exposed to the combination of an intense few-cycle chirped laser and a unipolar pulse. The HHG is dramatically extended and a ultrabroad supercontinuum spectra in the plateau is generated by adding a unipolar pulse to the few-cycle chirped laser at a proper time. By superposing the supercontinuum harmonics centered at several different central frequencies, we produced several isolated pulses in which the shortest one achieves 38-as.

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