par Dorr, Martin 
;Latinne, Olivier ;Joachain, Charles
Référence Physical review. A, Atomic, Molecular, and Optical Physics, 55, 5, page (3697-3703)
Publication Publié, 1997-05
;Latinne, Olivier ;Joachain, Charles Référence Physical review. A, Atomic, Molecular, and Optical Physics, 55, 5, page (3697-3703)
Publication Publié, 1997-05
Article révisé par les pairs
| Résumé : | We have solved the time-dependent Schrödinger equation to analyze the time evolution of a hydrogen atom, initially in its ground 1s state, interacting with a one- or two-color linearly polarized laser pulse which is tuned close to a two-photon resonance with the 2s metastable state. The two-photon transition therefore does not involve an intermediate resonance state. Using a suitable combination of two laser pulses of different frequencies, population can be transferred from the 1s state to the 2s state via the continuum. In both the single-color and the two-color cases, a maximum amount of 17% of population can be found in the 2s state at the end of the pulse. We compare and interpret our results in terms of the time-independent Floquet eigenvalues. The system can also be modeled by an "essential states" two-level atom with decay. Both the Flooquet and the time-dependent solutions are compared with the model predictions. The model allows systematic optimization studies for population transfer under a wide range of laser pulse parameters. |
