Effects of spontaneously generated coherence on the group velocity in a V system

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• 作者：Bai ; Yanfeng ; Guo ; Hong ; Han ; Dingan ; Sun ; Hui
• 关键词：Spontaneously generated coherence ; Group velocity
• 刊名：Physics Letters A
• 出版年：2005
• 出版时间：June 6, 2005
• 年：2005
• 卷：340
• 期：1-4
• 页码：342-346
• 全文大小：116 K

文摘

We show how the application of an incoherent pumping can produce a variety of effects on the propagation of a weak electromagnetic pulse in a V system with spontaneously generated coherence (SGC). There exists an incoherent pumping rate which makes the group velocity reach the extremum near the region of two-photon resonant excitation. The existence of SGC is just the cause for the occurrence of the extremum, and it may also be regarded as a knob which can be used to manipulate light propagation from subluminal to superluminal.