@inproceedings{31849ff6ff1a4451a7051e4066ca083c,
title = "Pulse propagation at negative group velocity in a transparent medium",
abstract = "Summary form only given. We use gain-assisted linear anomalous dispersion to demonstrate superluminal light pulse propagation with a negative group velocity through a transparent atomic medium. We place two Raman gain peaks closely to obtain an essentially lossless anomalous dispersion region that results in a superluminal group velocity. The group velocity of a pulse in this region exceeds c and can even become negative,while the shape of the pulse is preserved. We measured a negative group velocity index of ng=-315(±5). Experimentally, a light pulse propagating through the spin-polarized atomic vapor cell exits from it earlier than propagating through the same distance in vacuum by a time difference that is 315 times of the vacuum light propagation time L/c=0.2 ns.",
author = "A. Dogariu and A. Kuzmich and Wang, {L. J.}",
note = "Publisher Copyright: {\textcopyright} 2001 Optical Soc. Of America.; Quantum Electronics and Laser Science Conference, QELS 2001 ; Conference date: 06-05-2001 Through 11-05-2001",
year = "2001",
doi = "10.1109/QELS.2001.961776",
language = "English (US)",
series = "Technical Digest - Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference, QELS 2001",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
pages = "7--8",
booktitle = "Technical Digest - Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference, QELS 2001",
address = "United States",
}