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在一个具有超精细结构的四能级原子系统中的拉曼散射
引用本文:李家华,杨文星,彭菊村.在一个具有超精细结构的四能级原子系统中的拉曼散射[J].中国物理 B,2005,14(4):758-763.
作者姓名:李家华  杨文星  彭菊村
作者单位:Department of Physics, Huazhong University of Science and Technology, Wuhan,430074, China;Department of Physics, Huazhong University of Science and Technology, Wuhan,430074, China;Department of Physics, Xiaogan Normal University,Xiaogan, 432100, China
基金项目:Project supported by the National Natural Science Foundation of China (Grant Nos 60478029 and 10125419)
摘    要:在一个具有超精细结构的四能级原子系统中,为了压抑暂态过程和稳态过程两种情况下的弱探测光束的吸收,我们提出和分析了一种有效的拉曼散射计划。对于暂态过程,借助一个漂亮的Mathematic程序进行数值计算,我们发现在探测跃迁线中心探测吸收的幅度与一般的基于电磁感应透明的三能级原子系统相比要小。对于稳态情况,结果表明探测吸收在线中心能够被彻底地消除,正像通常的三能级电磁感应透明方案。特别地,我们的结果表明在拉曼共振的条件下探测吸收能够被彻底地消除,也就是说,对于稳态过程我们仅仅要求双光子失谐量在超精细二能级频率间隙内是零。与标准的三能级电磁感应透明方案相比,我们的四能级拉曼计划的优点之一是在拉曼共振条件下我们能观察到透明窗口,不需要严格地单光子和双光子失谐量为零。因此,原子超精细结构对于获取电磁感应透明不是一个障碍。

关 键 词:暂态吸收  稳态  穿衣原子态
收稿时间:2003-12-02

Raman scattering in a four-level atomic system with hyperfine structure
Li Jia-Hu,Yang Wen-Xing and Peng Ju-Cun.Raman scattering in a four-level atomic system with hyperfine structure[J].Chinese Physics B,2005,14(4):758-763.
Authors:Li Jia-Hu  Yang Wen-Xing and Peng Ju-Cun
Institution:Department of Physics, Huazhong University of Science and Technology, Wuhan,430074, China; Department of Physics, Xiaogan Normal University,Xiaogan, 432100, China
Abstract:We propose and analyse an efficient Raman scheme for suppressing the absorption of a weak probe beam in a typical four-level atomic system with a nearly hyperfine doublet structure of two higher-lying excited levels for the two cases of transient regime and steady-state process. For the transient process, using the numerical calculations by a nice MATHEMATICA code, we find that the magnitude of the probe absorption at line centre of the probe transition is small compared to the standard three-level atomic system based on electromagnetically induced transparency (EIT). In particular, our results show that the probe absorption can be completely eliminated under the condition of Raman resonance, i.e. we only require that two-photon detuning is zero within the range of the hyperfine two-level frequency gap for the case of the steady state. In contrast to the standard three-level EIT scheme, one of the key advantages of our four-level Raman scheme is that under the Raman resonance condition we can observe one transparency window without the need of exact vanishing of one- and two-photon detuning. As a consequence, the atomic hyperfine structure cannot be a hindrance for obtaining EIT.
Keywords:transient absorption  steady state  dressed atomic state
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