Coherence generation and population transfer in a three-level ladder system

doi:10.1088/1674-1056/20/5/050304

中国物理B ›› 2011, Vol. 20 ›› Issue (5): 50304-050304.doi: 10.1088/1674-1056/20/5/050304

Coherence generation and population transfer in a three-level ladder system

姜云¹, 王刚¹, 张理达¹, 吴金辉¹, 高锦岳¹, 张冰²

(1)College of Physics, Jilin University, Changchun 130023, China;Key Laboratory of Coherent Light and Atomic and Molecular Spectroscopy of Educational Ministry, Changchun 130023, China; (2)College of Physics, Jilin University, Changchun 130023, China;Key Laboratory of Coherent Light and Atomic and Molecular Spectroscopy of Educational Ministry, Changchun 130023, China;College of Physics and Electronic Engineering, Mudanjiang Teachers' College, Mudanjiang 157012, China;Heilongjiang Superhard Materials Key Laboratory, Mudanjiang 157012, China

收稿日期:2010-09-03 修回日期:2011-01-17 出版日期:2011-05-15 发布日期:2011-05-15
基金资助:
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).

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

Received:2010-09-03 Revised:2011-01-17 Online:2011-05-15 Published:2011-05-15
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: coherence, population transfer, spontaneous decay

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.

Key words: coherence, population transfer, spontaneous decay

中图分类号: (Quantum mechanics)

03.65.-w

42.50.-p (Quantum optics) 42.50.Gy (Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption) 42.55.Ah (General laser theory)

张冰, 姜云, 王刚, 张理达, 吴金辉, 高锦岳. Coherence generation and population transfer in a three-level ladder system[J]. 中国物理B, 2011, 20(5): 50304-050304.

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[J]. Chin. Phys. B, 2011, 20(5): 50304-050304.

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Coherence generation and population transfer in a three-level ladder system

Coherence generation and population transfer in a three-level ladder system

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