5 November 2010 Achieving efficient and stable coherent population transfer by ultrashort double pulses
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Proceedings Volume 7846, Quantum and Nonlinear Optics; 78460M (2010); doi: 10.1117/12.868314
Event: Photonics Asia 2010, 2010, Beijing, China
Abstract
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, Kening Jia, Ying Liang, Dianmin Tong, Xijun Fan, "Achieving efficient and stable coherent population transfer by ultrashort double pulses", Proc. SPIE 7846, Quantum and Nonlinear Optics, 78460M (5 November 2010); doi: 10.1117/12.868314; http://dx.doi.org/10.1117/12.868314
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KEYWORDS
Chemical species

Process control

Femtosecond phenomena

Composites

Control systems

Physics

Superposition

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