Copropagating superluminal and slow light manifested by electromagnetically assisted nonlinear optical processes.
Copropagating superluminal and slow light manifested by electromagnetically assisted nonlinear optical processes.
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DOI：
10.1364/ol.31.002598
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发表时间：
2006-09
期刊：
影响因子：
3.6
通讯作者：
Jie-peng Zhang;G. Hernandez;Yifu Zhu
中科院分区：
文献类型：
--
作者：
Jie-peng Zhang;G. Hernandez;Yifu Zhu
本文报道了电磁感应透明（EIT）和同时超光速和亚光速光传播辅助下的非线性光学增益和损耗的实验观察。在三能级EIT系统中，线偏振光的两个圆分量引发三阶非线性过程，其中一个圆分量被衰减，而另一个分量被放大。在原子共振附近，衰减的圆形分量经历陡峭的正常色散，并以缓慢的群速度传播，而放大的圆形分量经历陡峭的反常色散，并以超光速群速度传播。
We report an experimental observation of nonlinear optical gain and loss assisted by electromagnetically induced transparency (EIT) and simultaneous superluminal and subluminal light propagations. Two circular components of a linearly polarized light initiate third-order nonlinear processes in which one circular component is attenuated while the other component is amplified in a three-level EIT system. Near the atomic resonance, the attenuated circular component experiences steep normal dispersion and propagates with a slow group velocity, while the amplified circular component experiences steep anomalous dispersion and propagates with a superluminal group velocity.