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Competition of Concentration Narrowing and Power Broadening of a Dark Resonance in a Ladder System of Rubidium Atoms: Specificities of Its Occurrence in Thin Spectroscopic Cells

  • SPECTROSCOPY AND PHYSICS OF ATOMS AND MOLECULES
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Abstract

The effect of electromagnetically induced transparency (EIT) in a three-level ladder system 5S1/2‒5P3/2 –5D5/2 of Rb atoms is investigated. The effect of spectral narrowing of a dark resonance (DR) as a function of atomic vapor density and thickness L of a spectroscopic cell containing Rb vapor is demonstrated. Thickness L was varied in the range of 390 nm to 4 mm, while atomic density N was increased up to ~1016 cm–3; in the process, high-intensity coupling radiation and weak probe radiation were used. The strongest effect, namely, a 22-fold spectral narrowing of the DR, was achieved in a cell of thickness L = 4 mm. The effect of spectral narrowing was decreasing with decrease in thickness L: a 2.4-fold spectral narrowing of the DR was observed at L = 2 μm. Spectral narrowing was nearly absent at L = 0.8 μm, and spectral broadening of the DR was observed with further decrease in the cell thickness down to L = 0.4 μm. A close to 100% DR contrast was achieved in nearly all cases at moderate atomic densities and high intensities of the coupling radiation. An interpretation of the effect of spectral narrowing and broadening of the DR is proposed.

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ACKNOWLEDGMENTS

The authors are grateful to J. Keaveney for useful discussions.

Funding

This research was supported by the State Committee on Science of the Ministry of Education and Science of the Republic of Armenia (SCS MES RA), project no. 18T-1CO18. A. Sargsyan acknowledges the support of the State Committee on Science of the Ministry of Education and Science of the Republic of Armenia (SCS MES RA), project no. 19YR-1C017 for young scientists. T. A. Vartanyan acknowledges the financial support of the State Program for Support of Leading Universities of the Russian Federation (subsidy 08-08).

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Authors and Affiliations

  1. Institute for Physical Research, National Academy of Sciences of Armenia, 0203, Ashtarak, Armenia

    A. Sargsyan & D. Sarkisyan

  2. Joint Quantum Centre (Durham–Newcastle), Department of Physics, Durham University, South Road, DH1 3LE, Durham, United Kingdom

    Ch. S. Adams

  3. ITMO University, 197101, St. Petersburg, Russia

    T. A. Vartanyan

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  1. A. Sargsyan
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  2. Ch. S. Adams
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  3. T. A. Vartanyan
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  4. D. Sarkisyan
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Correspondence to T. A. Vartanyan.

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Sargsyan, A., Adams, C.S., Vartanyan, T.A. et al. Competition of Concentration Narrowing and Power Broadening of a Dark Resonance in a Ladder System of Rubidium Atoms: Specificities of Its Occurrence in Thin Spectroscopic Cells. Opt. Spectrosc. 128, 1543–1550 (2020). https://doi.org/10.1134/S0030400X20100227

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