Abstract

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. B 24, 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.

© 2008 Optical Society of America

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

Dingan Han, Yaguang Zeng, Weicheng Chen, Hong Lu, and Chunqing Huang
J. Opt. Soc. Am. B 24(9) 2244-2248 (2007)

Formation and interaction characteristics of two-component spatial weak-light soliton in a four-level double-Λ type system

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