SLOW AND FAST LIGHT PROPAGATION THROUGH LADDER-TYPE ATOMIC MEDIA WITH DEGENERATE ENERGY LEVELS

Nikola Filipović, Vladan Pavlović, Ljiljana Stevanović

DOI Number
https://doi.org/10.2298/FUPCT1902173F
First page
173
Last page
190

Abstract


We investigate the weak probe pulse propagation through the atomic medium, in the presence of the strong control laser field, under the regime of the electromagnetically induced transparency (EIT). These fields couple to the medium by forming the 3-level ladder configuration. We focus on two distinct cases: closed system, which is a non-degenerate, and open system, where the middle level is 3-fold degenerate, and the additional levels are coupled to the other levels only via spontaneous emission. The spatio-temporal profile of the probe pulse envelope is obtained by using the formalism of Maxwell-Bloch equations with the help of the Fourier transform method. We study the influence of the control field Rabi frequency, the spectral half-width of the initial pulse and decay rates on the propagation of the probe pulse. Several important pulse parameters are also calculated and discussed. It is shown that the group velocity of light can be controlled in such a manner that one can switch from slow to fast light and vice versa when changing the control Rabi frequency and spectral pulse half-width. Moreover, the possibility of replacing the open with an effective closed system is also discussed.

Keywords

Electromagnetically induced transparency, Slow light, Fast light, Energy level degeneracy, Closed system, Open system

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References


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