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Coherence generation and population transfer in a three-level ladder system |
| Zhang Bing(张冰)a)b)c)d), Jiang Yun(姜云)a)b), Wang Gang(王刚)a)b), Zhang Li-Da(张理达)a)b), Wu Jin-Hui(吴金辉) a)b), and Gao Jin-Yue(高锦岳)a)b)† |
| a College of Physics, Jilin University, Changchun 130023, China; b Key Laboratory of Coherent Light and Atomic and Molecular Spectroscopy of Educational Ministry, Changchun 130023, China; c College of Physics and Electronic Engineering, Mudanjiang Teachers' College, Mudanjiang 157012, China; d Heilongjiang Superhard Materials Key Laboratory, Mudanjiang 157012, China |
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Abstract This work explores the effect of spontaneous emission on coherence generation and population transfer in a three-level ladder atomic system driven by two pulses in counterintuitive order. With adiabatic evolution and the weak-dephasing approximation, we find that a large coherence and population transfer can be achieved even with spontaneous decay rate. The maximum coherence and population transfer decrease with the increase of spontaneous decay rate from the highest state to intermediate state. But this effect can be compensated by shortening the pulse width and enlarging the delay time. Results show that the coherence generation and population transfer never depend on the spontaneous decay rate from the intermediate state to ground state. The validity of the analytic solution is examined by numerical calculation.
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Received: 03 September 2010
Revised: 17 January 2011
Accepted manuscript online:
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PACS:
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03.65.-w
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(Quantum mechanics)
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42.50.-p
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(Quantum optics)
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42.50.Gy
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(Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)
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42.55.Ah
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(General laser theory)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 10774059), the National Basic Research Program of China (Grant No. 2006CB921101), and the Natural Science Foundation of Heilongjiang Province, China (Grant No. F200928). |
Cite this article:
Zhang Bing(张冰), Jiang Yun(姜云), Wang Gang(王刚), Zhang Li-Da(张理达), Wu Jin-Hui(吴金辉), and Gao Jin-Yue(高锦岳) Coherence generation and population transfer in a three-level ladder system 2011 Chin. Phys. B 20 050304
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