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篇目详细内容 |
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【篇名】 |
Coherent population transfer in four-level ladder systems by single frequency-chirped laser pulse |
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【刊名】 |
Frontiers of Physics in China |
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【刊名缩写】 |
Front. Phys. China |
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【ISSN】 |
1673-3487 |
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【EISSN】 |
1673-3606 |
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【DOI】 |
10.1007/s11467-009-0065-z |
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【出版社】 |
Higher Education Press and Springer-Verlag |
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【出版年】 |
2009 |
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【卷期】 |
4
卷4期 |
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【页码】 |
481-486
页,共
6
页 |
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【作者】 |
Xiao-hong LI（李小红）;
Xian-zhou ZHANG（张现周）;
Rui-zhou
ZHANG（张瑞州）;
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【关键词】 |
coherent population transfer; adiabatic passage; laser pulse; frequency sweep |
【摘要】 |
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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. |
