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Chinese Physics Letters

Interaction of Triply-Dressing Electromagnetically Induced Transparency in Five-level Folding Atomic System

Li Chang-Biao, Nie Zhi-Qiang, Zhang Wei-Feng, Zhang Yan-Peng, Jianping Song, Yuanyuan Li, Keqing Lu

Published Dec 1, 2008• 3 citations
Publisher

Abstract

We consider a five-level atomic folding system, which involve two kinds of dressing mechanisms (the nested-cascade and the sequential-cascade) in interaction of three-dressing fields, the numerical results show that three-dressing fields are interchangeable under certain conditions, which can be considered as two four-level sub-system configurations (a nested-cascade N configuration and a sequential-cascade inverted-Y configuration).

DOI
10.1088/0256-307x/25/12/022

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We consider a five-level atomic folding system, which involve two kinds of dressing mechanisms (the nested-cascade and the sequential-cascade) in interaction of three-dressing fields, the numerical results show that three-dressing fields are interchangeable under certain conditions, which can be considered as two four-level sub-system configurations (a nested-cascade N configuration and a sequential-cascade inverted-Y configuration).
We study the four-wave mixing (FWM) in an opening five-level system with two dressing fields. There are three kinds of doubly dressing mechanisms (parallel cascade, sequential cascade, and nested cascade) in the system for doubly dressed four-wave mixing. These mechanisms reflect different correlations between two dressing fields and different effects of two dressing fields to the FWM. Investigation of these mechanisms is helpful to understand the generated high-order nonlinear optical signal dressed by multi-fields.
We study three (nested, parallel, and sequential cascade) types of schemes for doubly dressed four-wave-mixing processes in an open five-level atomic system. The interaction between two dressing fields of the nested-cascade scheme is strongest and weakest for the parallel-cascade scheme, with the sequential scheme intermediate between them. Mutual-dressing processes and constructive or destructive interference between two coexisting dressed multiwave mixing channels in such a system are also considered. Investigations of these multidressing mechanisms and interactions are very useful to understand and control the generated high-order nonlinear optical signals.
The A-type three-level system coupled by two coherent fields is a basic model to study the electromagnetically induced transparency(EIT).Based on that,the cascade quasi- A-four-level configuration is formed when a radio-frequency(RF)field drives the transition between the excited state and an additional excited state level.The absorption property is studied along with the parameters of the coupling field and the RF driving field by numerically solving the relevant equations of motion of the density matrix.It is shown that under the applying of the coupling field and the RF driving field,both the Autler-Townes doublet and the EIT are observed in the absorptive spectra and it can be explained properly by the theory of dressed state.An important conclusion is that the Autler-Townes doublet originates from the atom system interaction with the strong RF field,while the EIT originates from atom system quantum interference interaction with the coupling field.
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.
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.