Switching from normal dispersion to anomalous dispersion in a four-level atomic system

被引：1
|
作者：
Kang, Zhi-Hui [1 ]
Meng, Fan [1 ]
Qu, Yan-Ji [1 ]
Wei, Xiao-Gang [2 ]
Li, Ai-Jun [1 ]
Wang, Lei [1 ]
Wang, Hai-Hua [1 ]
机构：
[1] Jilin Univ, Coll Phys, Changchun 130012, Peoples R China
[2] Beijing Acad Quantum Informat Sci, Beijing 100193, Peoples R China
来源：
LASER PHYSICS | 2021年 / 31卷 / 11期
基金：
中国国家自然科学基金;
关键词：
electromagnetically induced transparency; atomic coherence; normal dispersion; anomalous dispersion; GROUP-VELOCITY; FAST-LIGHT; SLOW;
D O I：
10.1088/1555-6611/ac2cce
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
The manipulation of the group velocity of light is very important in further information processing and quantum network. It is well known that subluminal and superluminal light propagation can be obtained by controlling the dispersion property of the experimental medium. In order to realize the switching from normal dispersion to anomalous dispersion at the same frequency, we investigate the dispersion and absorption properties of a four-level atomic system. By adjusting the intensity of an incoherent pump, we get transparent normal dispersion and lossless anomalous dispersion, which lead to subluminal and superluminal light propagation respectively. For a strong incoherent pump, the intensity of the coherent coupling field also can be used to realize a similar switching effect.
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页数：6
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