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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Phase control of linewidth of electromagnetically induced transparency coupled by double fields

Xiaomin Feng, Lianshui Zhang, Lijun Yang, Xiaoli Li

Published Oct 6, 2010• 0 citations
Publisher

Abstract

The effect of the relative phase on the spectral linewidth of electromagnetically induced transparency is studied in a Λ-type three-level configuration coupled by double coupling fields and the result is presented in this paper. We show that the relative phase between the double coupling fields has a great degree of influence on the spectral width of electromagnetically induced transparency window. The linewidth can be controlled by changing the relative phase. Particularly, as the double coupling fields have opposite phases, the linewidth of EIT window can be extremely narrow distinctly.

DOI
10.1117/12.869797

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The effect of the relative phase on the spectral linewidth of electromagnetically induced transparency is studied in a Λ-type three-level configuration coupled by double coupling fields and the result is presented in this paper. We show that the relative phase between the double coupling fields has a great degree of influence on the spectral width of electromagnetically induced transparency window. The linewidth can be controlled by changing the relative phase. Particularly, as the double coupling fields have opposite phases, the linewidth of EIT window can be extremely narrow distinctly.
We present a theoretical study on the spectral linewidth of electromagnetically induced transparency (EIT) in a cyclic three-level atomic system coupled by double coupling fields and a microwave field. The absorption profiles are obtained by a weak probe field scanning corresponding transition. It is shown that for definite Rabi frequencies of interacting fields the spectral linewidth of transparency windows depends on the relative phase between two coupling fields. In particular, as the relative phase of the double coupling fields approaches to , the linewidth narrows distinctly. This proposes a way to controlling spectral width of EIT by changing the relative phase between two fields.
The influence of the linewidth of coupling laser on the electromagnetically induced transparency (EIT) spectral width is theoretically investigated. The model to describe the EIT spectral width is based on the standard semi-classical theory. The result shows that the effect of the linewidth of coupling laser is equivalent to an additional relaxation between two ground states in the Λ-type configuration. A broadening linewidth of coupling laser implies the increasing relaxation between the two ground states, which will make the wider EIT spectral linewidth.
Both electromagnetically induced transparency(EIT)and electromagnetically induced absorption(EIA)were presented in a three-level Λ type configuration with double coupling fields.By numerically solving the density matrix equation of motion,the absorption profile of probe field depending on the parameters of coupling fields was demonstrated.By adjusting the Rabi frequencies and detunings of coupling fields,the spectral position of the EIA feature and the depth of the EIT feature can be controlled.
The influence of the linewidth of coupling laser on the electromagnetically induced transparency (EIT) spectral width is theoretically investigated. The model to describe the EIT spectral width is based on the standard semi-classical theory. The result shows that the effect of the linewidth of coupling laser is equivalent to an additional relaxation between two ground states in the A-type configuration. A broadening linewidth of coupling laser implies the increasing relaxation between the two ground states, which will make the wider EIT spectral linewidth.
Electromagnetically induced transparency(EIT) with extremely narrow spectral width is obtained in a well-studied lambda three level system where a coupling field and a probing field interact with two optical transitions.By tuning coupling field,it excites the transitions between two ground state hyperfine levels and excited state level.In this paper,both EIT and spontaneous radiation induced coherent dip can be obtained,and even the gain is observed to superpose to the EIT window.By discussing the behaviors of probing field absorption profiles under the effect of the tuned coupling field,it can be seen that there are quantum interference and coherence between EIT and spontaneous radiation induced coherent dip,and the coherence becomes remarkable when the excitation frequency of the coupling field satisfies certain conditions.
Electromagnetically induced transparency (EIT) resonance is obtained in a Λ three-level configuration when the coupling field and the probe field satisfy the two-photon resonance condition. When an additional microwave field drives the transition between two low levels of the Λ three-level system the EIT is observed to split into multiple EITs. In this paper we present a theoretical study of this effect. The results show that the EIT resonance can be split into triplet and the spectral positions of EIT windows is determined by the intensity and the frequency of the microwave field. Therefore, a microwave field can be used to open more than one EIT windows and the EIT frequency tuning can be realized by controlling intensity and frequency of the microwave field.