Acta Physica Sinica, Volume. 68, Issue 3, 033701-1(2019)
In 2011, Kumar et al. (2011 Phys. Rev. A
In this paper, we investigate further the strong nonlinear optical interaction between a two-level atomic system and a femtosecond Gaussian laser pulse by solving numerically the full-wave optical Bloch equations through using the predictor-corrector method. It is found that the light forces and the light potentials are sensitive to the value of the Rabi frequency and the detuning of the laser field. Under the resonant condition, the instant light forces induced by the femtosecond laser pulse change their signs as a function of time. The instant longitudinal light force changes its sign at twice the Rabi frequency, while the instant transverse light force changes its sign at twice the light carrier-wave frequency. However, none of the time-averaged light forces is zero, showing periodical oscillation characters as a function of Rabi frequency. Both of the time-averaged longitudinal and transverse light forces oscillate at the Rabi frequency corresponding to the pulse area of 2
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Ji-Cai Liu, Fei Cheng, Ya-Nan Zhao, Fen-Fen Guo.
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Received: Nov. 12, 2018
Accepted: --
Published Online: Oct. 28, 2019
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