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Laser Physics

Local modulation of double electromagnetically induced transparency in an inverted-Y atomic system

Zhiqiang Zeng, Shengyao Zhang, Fu-Ti Liu, Zenghui Gao

Published Jan 7, 2020• 2 citations
Publisher

Abstract

Abstract A four-level inverted-Y configuration driven by two control fields is considered to demonstrate the phenomenon of electromagnetically induced transparency (EIT). It is shown that the double EIT can be realized in this system. Such double transparency spectra can be locally modulated by changing the detunings as well as the Rabi frequencies of the control fields.

DOI
10.1088/1555-6611/ab6028

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Abstract A four-level inverted-Y configuration driven by two control fields is considered to demonstrate the phenomenon of electromagnetically induced transparency (EIT). It is shown that the double EIT can be realized in this system. Such double transparency spectra can be locally modulated by changing the detunings as well as the Rabi frequencies of the control fields.
Using matrix theory,the absorption and dispersion properties of a lamda-type four-level system driven by two coherent fields are investigated.The result obtained by means of numerical method indicates that by adjusting the intensity of Rabi frequencies of the coherent field in the steady state,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 double electromagnetically induced transparency,the location of transparent windows can be manipulated by controlling the detuning of the driving field.Additionally,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.
The absorption properties in an inverted-tripod scheme atomic system driven by the coherent fields are investigated by means of the semiclassical theory.The result obtained by means of numerical method indicates that by adjusting the Rabi frequencies of the coherent fields,there appear triple,double,single electromagnetically induced transparency(EIT).In the triple EIT,the location of transparent windows can be controlled by adjusting the detunings for the coherent fields,and changes continuously,i.e.there exist a series of continuous frequencies for the probe field propagating in an atomic medium without absorption in a certain range.Finally,the explanations of these phenomena are given by using the dressed states.
Using density matrix eqution, the absorption and dispersion properties of a A-type four-level system driven by coherent fields are investigated. The result obtained by means of numerical method indicates that by adjusting 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.
The electromagnetically induced transparency (EIT) phenomenon in a four level atomic system with tripod configuration is studied. The results show that this configuration is equivalent to the combination of two single three-level ΛΛΛ configurations, which, under certain conditions, results in the so-called double-EIT (DEIT) phenomenon. The properties of the double transparency windows for DEIT are discussed in detail and the possible experimental scheme is proposed.