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Acta Optica Sinica

Influence of Off-Resonant Coupling Field on Electromagnetically Induced Transparency and Electromagnetically Induced Absorption in A Closed Λ-Shaped Four-Level System

李晓莉 Li Xiaoli, 刘红娜 Liu Hongna, 杨悦 Yang Yue

Published Jan 1, 2011• 0 citations
Publisher
DOI
10.3788/aos20113101.102001

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Influence of Off-Resonant Coupling Field on Electromagnetically Induced Transparency and Electromagnetically Induced Absorption in A Closed Λ-Shaped Four-Level System

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Acta Optica Sinica•Jan 1, 2011•0 citations

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Phase-dependent electromagnetically induced transparency in an optically closed four-level system

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•Jan 1, 2000•0 citations
A quasi-lambda four-level system shows both electromagnetically induced absorption (EIA) and electromagnetically induced transparency (EIT). In addition to an optical coupling field and a probing field, there is a radio field which interacts with two excited state hyperfine levels of the quasi-lambda four-level system consisting of two excited state hyperfine levels and two ground state hyperfine levels. If a driving field which interacts with two ground state hyperfine levels is introduced, the quasi-lambda four-level system is modified to a closed-lambda four-level system. The behaviors of the driving field and radio field are studied in this paper and it is seen that the occurence of EIA or EIT and the whole probing properties are controlled by the Rabi frequencies of both driving field and radio field.
Electromagnetically induced transparency (EIT) resonance is obtained in a well-studied lambda three level system where an optical coupling field and a probing field interact with two optical transitions. However, both electromagnetically induced absorption (EIA) and EIT can be obtained in a modified quasi-lambda four level system consisting of an optical-radio two-photon coupling field and a probing field. By solving the density matrix equation of motion, a physical account of EIA and EIT is given in terms of a dressed state picture. It can be seen that the optical coupling field in this quasi-lambda four level system has a crucial effect on the forming of EIA and EIT. An EIA is observed under a resonant optical coupling and it evolves into an EIT when there is a detuning. Furthermore, the width of EIA or EIT increases as the optical coupling Rabi frequency increases.