Abstract
The photoionization of a helium atom by short intense laser pulses is studied theoretically in the vicinity of the $2s2p{\phantom{\rule{0.28em}{0ex}}}^{1}P$ doubly excited state with the intention to investigate the impact of the intensity and duration of the exciting pulse on the dynamics of the autoionization process. For that purpose, we solve numerically the corresponding time-dependent Schr\"odinger equation by applying the time-dependent restricted-active-space configuration-interaction method (TD-RASCI). The present numerical results clearly demonstrate that the Fano interferences can be controlled by a single high-frequency pulse. As long as the pulse duration is comparable to the autoionization lifetime, varying the peak intensity of the pulse enables manipulation of the underlying Fano interference. In particular, the asymmetric profile observed for the $2s2p{\phantom{\rule{0.28em}{0ex}}}^{1}P$ doubly excited state of He in the weak-field ionization can be smoothly transformed to a window-type interference profile.
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