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Journal of the Optical Society of America B

Superluminal solitons in a Λ-type atomic system with two-folded levels

Dingan Han, Yaguang Zeng, Weicheng Chen, H. Lu, Chunqing Huang

Published Aug 20, 2007• 11 citations
Publisher

Abstract

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.
DOI
10.1364/josab.24.002244

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We show that the analysis of the optical solitons in a resonant, lifetime-broadened Λ-type atomic system with two-folded lower levels, given recently by D. Han et al. [J. Opt. Soc. Am. B24, 2244 (2007)], is incorrect. Although in the anomalous dispersion regime near resonance one may obtain a superluminal optical soliton, such a soliton suffers serious absorption and hence cannot propagate a significant distance. However, by choosing appropriate system parameters to work in the normal dispersion regime and hence inside the transparency windows of double dark resonance, an ultraslow optical soliton with very low light intensity can form and propagate stably for a fairly long distance.
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