Multiple electromagnetically induced transparency in a four-level atomic system

Abstract

Abstract:

Using matrix eqution,the absorption and dispersion properties of a lamda-type four-level system driven by coherent fields are investigated.The result obtained by means of numerical method indicates that by adjusting the the intensity of Rabi frequencies of the coherent field in the steady state,three,double or single electromagnetically induced transparency (EIT) can appear explicitly in this system.And the explanations of these phenomena are given by using the dressed states.In the three EIT,the location of transparent windows can be manipulated by controlling the detuning of the driving field.What’s more,it is also found that the medium shows a large refractive index at each transparency window,and the group velocity of the probe laser can be enhanced.

Key words: quantum optics, electromagnetically induced transparency, absorption, dispersion, group velocity

WANG Xiang-Wei, ZHANG Xiang-Yang. Multiple electromagnetically induced transparency in a four-level atomic system[J]. J4, 2010, 27(1): 21-25.

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