Coherent population transfer in four-level ladder
systems by single frequency-chirped laser pulse

doi:10.1007/s11467-009-0065-z

Front. Phys.

2009, Vol. 4

Issue (4) : 481-486 https://doi.org/10.1007/s11467-009-0065-z

Research articles

Coherent population transfer in four-level ladder systems by single frequency-chirped laser pulse

Xiao-hong LI（李小红）¹,Rui-zhou ZHANG（张瑞州）¹,Xian-zhou ZHANG（张现周）²,

1.College of Science, Henan University of Science and Technology, Luoyang 471003, China; 2.Department of Physics, Henan Normal University, Xinxiang 453007, China;

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Abstract Adiabatic passage induced by a frequency-chirped laser pulse in four-level ladder systems is investigated. Two different strategies for efficient population transfer (intuitive and counterintuitive laser pulse) are analyzed. For the larger detuning, the four-level ladder system can be reduced to a two-level system with which we are familiar. For the smaller detuning, the main conditions for realization of population transfer are the following: the width of the transform-limited laser pulse envelope frequency spectrum (without chirp) must be smaller and the peak Rabi frequency of the pulse must be larger than the detuning ε₂₁ and ε₂₁∼ε₃₂ in the case of the three-photon resonance. With this laser pulse, it is possible to achieve complete population via the intermediate levels by three successive adiabatic passages. Complete inversion is also obtained by a counterintuitive direction of the frequency sweep.

Keywords coherent population transfer adiabatic passage laser pulse frequency sweep

Issue Date: 05 December 2009

Cite this article:

Xiao-hong LI（李小红）,Rui-zhou ZHANG（张瑞州）,Xian-zhou ZHANG（张现周）. Coherent population transfer in four-level ladder systems by single frequency-chirped laser pulse[J]. Front. Phys. , 2009, 4(4): 481-486.

URL:

https://academic.hep.com.cn/fop/EN/10.1007/s11467-009-0065-z
https://academic.hep.com.cn/fop/EN/Y2009/V4/I4/481

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