Subluminal and Superluminal Phenomena in a Four-Level Atom |
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Authors: | HAN Ding-An ZENG Ya-Guang CAO Hui |
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Institution: | Physics Department, Foshan University, Foshan 528000, China |
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Abstract: | In a four-level atomic system, we investigate the light pulse
propagation properties interacting with only one laser field. It is
shown that in the steady state, the group velocity of the light
pulse can be changed from subluminal to superluminal by varying the
field detuning. Meanwhile, the effects of the field intensity on the
group velocity are also shown. At last, with special parameters, the
analytical solution for the group index is also obtained. |
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Keywords: | superluminal subluminal |
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