Steering population transfer between electronic states of the Na2 molecule beyond the rotating wave approximation

作者：Han, Yong-Chang^*

来源：Journal of Physics B: Atomic, Molecular and Optical Physics , 2017, 50(22): 225401.

DOI：10.1088/1361-6455/aa90d9

• population transfer
• femtosecond laser pulses
• rotating wave approximation
• adiabatic passage

By utilizing the time-dependent wavepacket method, we studied the population transfer between the electronic states of the Na-2 molecule driven by femtosecond laser pulses. Three electronic states, X-1 Sigma(+)(g), A(1)Sigma(+)(u) and 2(1)Pi(g), are taken to be the initial, the intermediate and the target states, respectively. Two classes of calculations are performed for comparison: one is to invoke the rotating wave approximation (RWA), and the other is more accurate calculations without consideration of RWA (non-RWA). It is found that for this three-state-model, the RWA fails to describe the accurate population transfer process in femtosecond-pulse fields and that the adiabatic passage is hard to be constructed in the non-RWA calculations. Based on the non-RWA calculations, we determined a set of laser parameters, including the peak intensity, detuning, pulse duration and time delay, for efficient population transfer.

• 出版日期2017-11-28
• 单位大连理工大学