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Study of the Interaction of Potassium Atoms with the Sapphire Surface with the Use of an Ultrathin Spectroscopic Cell

  • OPTICS AND LASER PHYSICS
  • Published:
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The effect of the dielectric surface on the 39K D1 line (Fg = 1, 2 → Fe = 1, 2 transitions) at nanometer distances has been experimentally studied for the first time. A nanocell that is filled with atomic potassium and has a wedge gap has been used to study the effect of atoms at distances of 50–800 nm from the technical sapphire window surface. At distances L < 100 nm from the sapphire surface, the van der Waals interaction strongly broadens atomic transitions and their frequencies are redshifted. The second derivative method applied to the absorption spectra of the nanocell has allowed the first measurement of the van der Waals interaction coefficient C3 = (1.2 ± 0.3) kHz μm3 for the 39K D1 line. It has been shown that the dipole–dipole interaction between 39K atoms results in the additional redshift at an increase in the density of atoms for the nanocell thickness L < 70 nm. The results obtained are important for the development of submicron devices containing free atoms.

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AKNOWLEDGMENTS

We are grateful to Ara Tonoyan for technical assistance.

Funding

This work was supported by the State Committee for Science, Ministry of Education and Science of the Republic of Armenia (project no. N21T-1C005).

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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. Institute of Physics, Croatian Academy of Sciences and Arts, 10000, Zagreb, Croatia

    G. Pichler

Authors
  1. A. Sargsyan
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  2. G. Pichler
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  3. D. Sarkisyan
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Corresponding authors

Correspondence to A. Sargsyan or D. Sarkisyan.

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Translated by R. Tyapaev

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Sargsyan, A., Pichler, G. & Sarkisyan, D. Study of the Interaction of Potassium Atoms with the Sapphire Surface with the Use of an Ultrathin Spectroscopic Cell. Jetp Lett. 115, 312–317 (2022). https://doi.org/10.1134/S0021364022100198

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  • DOI: https://doi.org/10.1134/S0021364022100198

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