Switching from subluminal to superluminal light propagation via a coherent pump field in a four-level atomic system
Journal Article
·
· Journal of the Optical Society of America. Part B, Optical Physics
- College of Physics, Jilin University, Changchun 130023 (China)
We theoretically investigate the influence of a coherent pump field on the propagation of a weak light pulse of a probe field in a four-level atomic system. Due to the modulation of the pump field, the light pulse can be manipulated from subluminal to superluminal with negligible distortion. This scheme can be realized in both the ultracold and Doppler-broadened atomic systems. We also demonstrate that the spectral linewidth with an anomalous dispersion is reduced by thermal averaging; therefore, one can obtain a larger negative group refractive index in room-temperature vapor than the largest value achieved in ultracold atomic gas.
- OSTI ID:
- 22046833
- 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: 12 Vol. 26; ISSN JOBPDE; ISSN 0740-3224
- Country of Publication:
- United States
- Language:
- English
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