Superluminal light propagation assisted by Zeeman coherence

Huijuan He, Zhengfeng Hu, Yuzhu Wang, Ligang Wang, Shi Yao ZHU

Research output: Contribution to journalJournal articlepeer-review

5 Citations (Scopus)


We have observed a dispersionlike absorption (or gain) spectrum at the D1 transition in a Rb vapor cell filled with a buffer gas, due to Zeeman coherence of the ground states in a double A configuration. Meanwhile, we have also observed superluminal pulse propagation. It is experimentally demonstrated that the front speed of a light pulse still equals the light speed c in vacuum, although the group velocity of the light pulse is (-2.2±0.6)×104 m/s.

Original languageEnglish
Pages (from-to)2486-2488
Number of pages3
JournalOptics Letters
Issue number16
Publication statusPublished - 15 Aug 2006

Scopus Subject Areas

  • Atomic and Molecular Physics, and Optics


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