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Switching from EIT to EIA in a four-level N-type atomic system

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Abstract

We study the optical properties of a four-level N-type system theoretically for \(^{87}\)Rb atoms using density matrix formalism. Electromagnetically induced transparency and electromagnetically induced absorption (EIA) are two extensively studied two-photon coherence phenomena. EIA can be observed as a result of the transfer of coherence and transfer of population between the atomic levels. A narrow absorption is observed at the resonance frequency for moving atoms. Enhanced transmission and absorption lead to sub-luminal and super-luminal light propagation, respectively. It is observed that the third field in N-type system causes switching from transmission to absorption. We also discuss group index changes with coupling field strength.

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Acknowledgements

KY acknowledges financial support from the MHRD, India. This work is supported by the SERB, India (Grant No. SB/S2/LOP/009/2014).

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  1. Department of Physics, Indian Institute of Technology, Roorkee, Roorkee, 247 667, India

    Kavita Yadav & Ajay Wasan

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  1. Kavita Yadav
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  2. Ajay Wasan
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Correspondence to Ajay Wasan.

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Yadav, K., Wasan, A. Switching from EIT to EIA in a four-level N-type atomic system. J Opt 48, 65–69 (2019). https://doi.org/10.1007/s12596-018-0495-5

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