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Controlling optical multistability and all-optical switching in a four level Y-type atomic system

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Abstract

We present a theoretical study on optical bistability (OB), optical multistability (OM), and all-optical switching in a four-level Y-type atomic system. The density matrix formalism is used to derive the Optical Bloch equations in order to find out the response of the probe laser field. The characteristics of OB and OM have been studied under unidirectional ring cavity configuration. The line parameters of D1 transition of 87Rb isotope have been used in the simulation. The system exhibits OM without consideration of any additional coherence effect like spontaneously generated coherence in the theoretical formalism. Threshold intensities and hysteresis widths of OB as well as OM can be effectively tuned by varying the intensity and frequency detuning of the coherent fields. Dynamic control of the probe laser pulse propagating through the medium has been investigated. We also demonstrate the conversion of a continuous wave input probe field into output switched pulse. The ON/OFF time of the switched probe pulse can also be controlled by tuning the field parameters. Such a system would be very useful in designing all-optical switching devices and optical storage devices.

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Acknowledgements

Surajit Goldar acknowledges the Council of Scientific and Industrial Research (CSIR), New Delhi for providing a research fellowship (File no. 09/0202(13805)/2022-EMR-I). The authors thank Prof. Swapan Mandal (Department of Physics, Visva-Bharati) for many helpful suggestions.

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  1. Department of Physics, Visva-Bharati, Santiniektan, West Bengal, 731235, India

    Suman Garain, Surajit Goldar, Subhasish Roy & Amitava Bandyopadhyay

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  1. Suman Garain
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  2. Surajit Goldar
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  4. Amitava Bandyopadhyay
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Correspondence to Amitava Bandyopadhyay.

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Garain, S., Goldar, S., Roy, S. et al. Controlling optical multistability and all-optical switching in a four level Y-type atomic system. Indian J Phys (2024). https://doi.org/10.1007/s12648-024-03088-5

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