By numerically solving the three-dimensional time-dependent Schrödinger equation,we have investigated multiphoton ionization of hydrogen atom in the two-color circularly polarized(TCCP)laser fields consisting of ...By numerically solving the three-dimensional time-dependent Schrödinger equation,we have investigated multiphoton ionization of hydrogen atom in the two-color circularly polarized(TCCP)laser fields consisting of a strong 400 nm and a much weaker 800 nm pulses.Due to the presence of perturbative 800 nm laser pulse,sideband peaks emerge between the above-threshold ionization rings in the photoelectron momentum distributions.Our numerical results show that the sideband peaks exhibit one-lobe structure in the co-rotating TCCP laser fields,while it displays the three-lobe structure in the counter-rotating TCCP laser fields.Moreover,the photoelectron yield of sidebands in the co-rotating TCCP fields is much higher than those of the counter-rotating TCCP fields.These phenomena could be well explained from the perspective of the photon-absorption channels via the selection rules.Interestingly,an obvious phase shift between the sidebands of different orders from the co-rotating and counter-rotating TCCP fields is observed.This shift indicates the helicity-dependent time delay in the one-photon continuum-continuum transition process.展开更多
基金This work was supported by the National Key Research and Development Program of China(Grants No.2019YFA0308300)the National Natural Science Foundation of China(Grant Nos.11874163 and 12021004).
文摘By numerically solving the three-dimensional time-dependent Schrödinger equation,we have investigated multiphoton ionization of hydrogen atom in the two-color circularly polarized(TCCP)laser fields consisting of a strong 400 nm and a much weaker 800 nm pulses.Due to the presence of perturbative 800 nm laser pulse,sideband peaks emerge between the above-threshold ionization rings in the photoelectron momentum distributions.Our numerical results show that the sideband peaks exhibit one-lobe structure in the co-rotating TCCP laser fields,while it displays the three-lobe structure in the counter-rotating TCCP laser fields.Moreover,the photoelectron yield of sidebands in the co-rotating TCCP fields is much higher than those of the counter-rotating TCCP fields.These phenomena could be well explained from the perspective of the photon-absorption channels via the selection rules.Interestingly,an obvious phase shift between the sidebands of different orders from the co-rotating and counter-rotating TCCP fields is observed.This shift indicates the helicity-dependent time delay in the one-photon continuum-continuum transition process.
