| 简并二能级系统中的正负色散(英文) |
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| 引用本文： | 孙庆青,古英,龚旗煌.简并二能级系统中的正负色散(英文)[J].中国传媒大学学报,2004(Z1). |
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| 作者姓名： | 孙庆青 古英 龚旗煌 |
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| 作者单位： | 北京大学物理学院人工微结构和介观物理国家重点实验室，北京大学物理学院人工微结构和介观物理国家重点实验室，北京大学物理学院人工微结构和介观物理国家重点实验室 北京 100871，北京 100871，北京 100871 |
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| 摘 要： | 通过解光学布洛赫方程,考察了简并二能级系统的吸收色散性质。采用一束平行线偏振光(π)泵浦和一束横向线偏振光(σ±)探测,在有磁场的情况下简并被破坏,改变耦合光强时发现了失谐零点正负色散之间的转化,这样我们就得到了慢光速与超光速之间的转变。在其它泵探光场偏振情况下同样有正负色散变化,它普遍存在于简并能级系统中。同时我们还发现了吸收谱中的电磁诱导透明、电磁诱导吸收、Mollow吸收谱型等现象。
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| 关 键 词： | 色散 量子相干 塞曼分裂 拉比频率 |
Positive and Negative Dispersion in Two-level Degenerate Systems |
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| SUN Qing-qing,GU Ying,GONG Qi-huang.Positive and Negative Dispersion in Two-level Degenerate Systems[J].Journal of Communication University of China Science and TEchnology,2004(Z1). |
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| Authors: | SUN Qing-qing GU Ying GONG Qi-huang |
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| Abstract: | We investigate the dispersion and absorption in the coherently prepared two-level degenerate systems. Driven by a parallel polarized light and probed by a transverse polarized light, in the degeneracy case, only the positive dispersion is obtained at the zero pump-probe detuning, as well as electromagnetic induced transparency. When magnetic field breaks the degeneracy, we find that the dispersion is shifted from positive, via negative, to positive when varying the drive Rabi frequency, which means a transition between the superluminal and subluminel group velocity. Simultaneously, in these systems, the electromagnetic induced transparency, electromagnetic induced absorption and Mollow absorption spectrum are shown in the absorption spectra. |
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| Keywords: | Dispersion Quantum coherence Zeeman splitting Rabi frequency |
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