Physics – Quantum Physics
Scientific paper
2007-09-06
J. Phys. B: At. Mol. Opt. Phys. 41, 025504 (2008)
Physics
Quantum Physics
Scientific paper
10.1088/0953-4075/41/2/025504
The propagation of a weak probe field in a laser-driven four-level atomic system is investigated. We choose mercury as our model system, where the probe transition is in the ultraviolet region. A high-resolution peak appears in the optical spectra due to the presence of interacting dark resonances. We show that this narrow peak leads to superluminal light propagation with strong absorption, and thus by itself is only of limited interest. But if in addition a weak incoherent pump field is applied to the probe transition, then the peak structure can be changed such that both sub- and superluminal light propagation or a negative group velocity can be achieved without absorption, controlled by the incoherent pumping strength.
Evers Joep
Mahmoudi Mohammad
Sahrai Mostafa
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