A classical ensemble method is used to investigate nonsequential double ionization（NSDI） of Ar atoms irradiated by linearly polarized few-cycle laser pulses. The correlated-electron momentum distribution（CMD） exhi...A classical ensemble method is used to investigate nonsequential double ionization（NSDI） of Ar atoms irradiated by linearly polarized few-cycle laser pulses. The correlated-electron momentum distribution（CMD） exhibits a strong dependence on the carrier-envelope phase（CEP）. When the pulse duration is four cycles, the CMD shows a cross-like structure, which is consistent with experimental results. The CEP dependence is more notable when the laser pulse duration is decreased to two cycles and a special L-shaped structure appears in CMD. Recollision time of returning electrons greatly depends on CEP, which plays a significant role in accounting for the appearance of this structure.展开更多
By means of the numerical solution of time-dependent Schr6dinger equation, we verify a scaling law of photoionization in ultrashort pulses. We find that for a given carrier-envelope phase and duration of the pulse, id...By means of the numerical solution of time-dependent Schr6dinger equation, we verify a scaling law of photoionization in ultrashort pulses. We find that for a given carrier-envelope phase and duration of the pulse, identical photoionizations are obtained provided that when the central frequency of the pulse is enlarged by k times, the atomic binding potential is enlarged by k times, and the laser intensity is enlarged by ka times. The scaling law allows us to reach a significant control over direction of photoemission and offers exciting prospects of reaching similar physical processes in different interacting systems which constitutes a novel kind of coherent control.展开更多
基金supported by the National Natural Science Foundation of China(No.61275103)the Natural Science Foundation of Shanghai(No.18ZR1413600)
文摘A classical ensemble method is used to investigate nonsequential double ionization（NSDI） of Ar atoms irradiated by linearly polarized few-cycle laser pulses. The correlated-electron momentum distribution（CMD） exhibits a strong dependence on the carrier-envelope phase（CEP）. When the pulse duration is four cycles, the CMD shows a cross-like structure, which is consistent with experimental results. The CEP dependence is more notable when the laser pulse duration is decreased to two cycles and a special L-shaped structure appears in CMD. Recollision time of returning electrons greatly depends on CEP, which plays a significant role in accounting for the appearance of this structure.
基金Supported by the National Science Foundation of China under Grant No 60408008, the Natural Science Key Foundation of Shanghai under Grant No 04JC14036, and the Shanghai Rising-Star Programme.
文摘By means of the numerical solution of time-dependent Schr6dinger equation, we verify a scaling law of photoionization in ultrashort pulses. We find that for a given carrier-envelope phase and duration of the pulse, identical photoionizations are obtained provided that when the central frequency of the pulse is enlarged by k times, the atomic binding potential is enlarged by k times, and the laser intensity is enlarged by ka times. The scaling law allows us to reach a significant control over direction of photoemission and offers exciting prospects of reaching similar physical processes in different interacting systems which constitutes a novel kind of coherent control.
