Physical interpretation for the correlation spectra of electromagnetically-induced-transparency resonances.
Physical interpretation for the correlation spectra of electromagnetically-induced-transparency resonances.
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DOI：
10.1364/oe.21.001512
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发表时间：
2013-01
期刊：
影响因子：
3.8
通讯作者：
D. Felinto;L. S. Cruz;R. A. de Oliveira;H. M. Florez;M. D. de Miranda;P. Nussenzveig;M. Martinelli;J. Tabosa
中科院分区：
文献类型：
--
作者：
D. Felinto;L. S. Cruz;R. A. de Oliveira;H. M. Florez;M. D. de Miranda;P. Nussenzveig;M. Martinelli;J. Tabosa
电磁诱导透明（EIT）现象可以在与原子系综相互作用的两个光场之间引起不同类型的关联。例如，目前公知的是，在EIT谐振附近，随着功率增加，低功率下的主导相关性变成反相关性。这种相关谱呈现出显著的与功率展宽无关的特征，测量特征线宽的最佳条件发生在最高功率处。在目前的工作中，我们调查的物理机制负责这组意见。我们的方法是第一次重现这些效果在一个更好的控制实验装置：冷原子系综，从磁光阱。然后将这个概念上更简单的系统的结果与相应的更简单的理论进行比较，该理论清楚地将观察到的特征与EIT的两个关键方面之间的相互作用联系起来：透明度本身和双光子共振附近的陡峭正常色散。
The phenomenon called Electromagnetically Induced Transparency (EIT) may induce different types of correlation between two optical fields interacting with an ensemble of atoms. It is presently well known, for example, that in the vicinity of an EIT resonance the dominant correlations at low powers turn into anti-correlations as power increases. Such correlation spectra present striking power-broadening-independent features, with the best condition for measuring the characteristic linewidth occurring at the highest powers. In the present work we investigate the physical mechanisms responsible for this set of observations. Our approach is first to reproduce these effects in a better controlled experimental setup: a cold atomic ensemble, obtained from a magneto-optical trap. The results from this conceptually simpler system were then compared to a correspondingly simpler theory, which clearly relates the observed features to the interplay between two key aspects of EIT: the transparency itself and the steep normal dispersion near two-photon resonance.