With one weak pulsed probe field, one strong pumping field, and one coupling field, superluminal optical solitons are formed in a lifetime-broadened Λ-type atomic medium with two-folded levels. The corresponding group velocity of the solitons can be larger than the vacuum light speed c; i.e., superluminal solitons can be presented.
© 2007 Optical Society of America
Original Manuscript: August 11, 2006
Revised Manuscript: May 23, 2007
Manuscript Accepted: May 25, 2007
Published: August 20, 2007
Dingan Han, Yaguang Zeng, Weicheng Chen, Hong Lu, and Chunqing Huang, "Superluminal solitons in a Λ-type atomic system with two-folded levels," J. Opt. Soc. Am. B 24, 2244-2248 (2007)