Comment on 'Superluminal solitons in a {lambda}-type atomic system with two-folded levels'

Journal Article · Sun Jun 15 04:00:00 EDT 2008 · Journal of the Optical Society of America. Part B, Optical Physics

DOI:https://doi.org/10.1364/JOSAB.25.000951· OSTI ID:21100302

Chao, Hang; Guoxiang, Huang ^[1]; Bin, Luo ^[2]

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1. State Key Laboratory of Precision Spectroscopy and Department of Physics, East China Normal University, Shanghai 200062 (China)
2. Department of Physics and Information Science, Yulin Normal University, Yulin 537000, Guangxi (China)

We show that the analysis of the optical solitons in a resonant, lifetime-broadened {lambda}-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.

• OSTI ID: 21100302
• Journal Information: Journal of the Optical Society of America. Part B, Optical Physics, Journal Name: Journal of the Optical Society of America. Part B, Optical Physics Journal Issue: 6 Vol. 25; ISSN JOBPDE; ISSN 0740-3224
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION
DISPERSIONS
LIFETIME
OPTICAL DISPERSION
PHOTON-ATOM COLLISIONS
RESONANCE
SOLITONS
SUPERRADIANCE
VISIBLE RADIATION