Coherent phase control in ionization of Magnesium by a bichromatic laser field of frequencies \omega and 2\omega

TL;DR

This study explores how the phase of a bichromatic laser field influences the ionization process of magnesium, revealing strong phase-dependent control over autoionization and ionization rates through theoretical and time-dependent calculations.

Contribution

It demonstrates the coherent phase control of magnesium ionization via bichromatic laser fields, including a detailed analysis of phase effects on autoionization line shapes and ionization yields.

Findings

Ionization yield strongly depends on the relative phase of the laser fields.

Autoionizing line shape can be modified by phase control.

Time-dependent calculations confirm phase effects across resonant states.

Abstract

We have investigated the coherent phase control on the (3p^{2}) autoionizing state (AIS) resonantly coupled with the ground state for Mg through a two- and a four-photon transition simultaneously, using a bichromatic linearly polarized laser field. The frequency is chosen such that the lasers are tunable around resonance with the transition (3s^{2}(^{1}S^e)\rightarrow 3p^{2}(^{1}S^e)), which implies (\omega_{f}=2.11) eV and (\omega_{h}=4.22) eV. We are interested in the modification of autoionizing (AI) line shape through the relative phase and laser intensities. A strong phase dependence on the total ionization yield and ionization rate is found. We also performed a time-dependent calculation which takes into consideration all the resonant states of the process.