4 November 2010 Achieving efficient and stable coherent population transfer by ultrashort double pulses
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It is shown that, when two femtosecond chirped Gaussian pulses with equal pulse area and same size but opposite sign of the chirp coefficient, which will be simply called as double pulses, overlap and propagate in the three-level Λ-type atomic medium, both coherence between the double pulses and interaction between the double pulses and the atomic medium arise. Adjusting size of the chirp coefficient can change shape, i.e. field distribution, of the composite pulse of the double pulses, at the same time affect the interaction between the composite pulse field and atoms, and thereby control oscillation process and value of the atomic population. By selecting suitable size of the chirp coefficient, we can make the atoms at the lowest level exciting completely to the higher level; moreover the new population distribution is stationary. It is also show that, for the double pulses with any area, efficient and stable population transfer always can be realized by adjusting size of the chirp coefficient. And this conclusion doesn't vary with the pulse width or the medium density varying.
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Zhendong Wang, Zhendong Wang, Kening Jia, Kening Jia, Ying Liang, Ying Liang, Dianmin Tong, Dianmin Tong, Xijun Fan, Xijun Fan, } "Achieving efficient and stable coherent population transfer by ultrashort double pulses", Proc. SPIE 7846, Quantum and Nonlinear Optics, 78460M (4 November 2010); doi: 10.1117/12.868314; https://doi.org/10.1117/12.868314

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