Precise control of the ionization channel in strong-field ionization by a few-cycle chirped laser pulse

Abstract

We investigate theoretically the photoelectron holography in strong-field ionization by a few-cycle chirped laser pulse. It is shown that the numerical results by solving the two-dimensional (2D) time-dependent Schr\"odinger equation (TDSE) are in agreement with that by using the semiclassical two-step (SCTS) model. The opening and the closing of the ionization channel can be controlled precisely by a few-cycle chirped laser pulse and the holographic interference structure can be isolated by adjusting the chirp parameters. This holographic interference structure is related to the rescattered electron wave packet (EWP) which released within an attosecond timescale. We demonstrate that the chirped laser pulse can be used to coherently control the recollision process. By analyzing the rescattered trajectory, we illustrate that the travel time of the rescattered electron is increased and the rescattered electron can obtain high return energy in a negatively chirped laser pulse. In addition, we also illustrate that the photoelectron momentum distributions (PMDs) are very sensitive to the carrier-envelope phase.