Observation of arbitrary group velocities of light from superluminal to subluminal on a single atomic transition line

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We were able to arbitrarily control the speed of a light pulse from subluminal to superluminal velocity by changing only the power of the laser for coupling coherently the single transition between 6 (S1/2F)-S-2=4 and 6 (P3/2F')-P-2=5 in the D-2 line of a Cs atomic vapor system. With weak coupling power, a Gaussian light pulse was propagated superluminally with a negative group velocity v(g)=-c/14 400, which is caused by a highly anomalous dispersion related to an electromagnetically induced absorption. By increasing the coupling power at the same laser frequency, the pulses were propagated with a vacuum speed at the middle power and a subluminal group velocity v(g)=c/3000 at high power, which is caused by a normal dispersion related to an electromagnetically induced transparency. It was also found that group velocities depend largely on polarization combinations.
Publisher
AMER PHYSICAL SOC
Issue Date
2003-07
Language
English
Article Type
Article
Keywords

ELECTROMAGNETICALLY INDUCED ABSORPTION; INDUCED TRANSPARENCY; PULSE-PROPAGATION; RB VAPOR; DEPENDENCE; COHERENCE; SPECTRA; STORAGE

Citation

PHYSICAL REVIEW A, v.68, pp.623 - 631

ISSN
1050-2947
DOI
10.1103/PhysRevA.68.013810
URI
http://hdl.handle.net/10203/78888
Appears in Collection
RIMS Journal Papers
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