Gain-assisted sub- and super-luminal in a ladder atomic system

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• 作者：Yaguang Zeng ; Dingan Han ; Yanfeng Bai ; Weicheng Chen ; Hui Cao ; Hong Lu
• 关键词：Dispersion ; Gain ; Sub-luminal ; Super-luminal
• 刊名：Physics Letters A
• 出版年：2009
• 出版时间：21 September 2009
• 年：2009
• 卷：373
• 期：39
• 页码：3591-3593
• 全文大小：328 K

文摘

With the occurrence of an incoherent pumping field, the properties of the dispersion and the absorption of a three-level ladder-type system are changed greatly. With proper parameters, the system can produce normal and anomalous dispersion regions in the gain region. The existence of the incoherent pumping is the cause for these phenomena, and it can be a knob to manipulate the group velocity of a weak probe field from sub-luminal to super-luminal.