Abstract
In this paper we discuss a novel use of a Cs-filled optical cell with micrometric thickness. The cell intrinsically contains an extremely small number of Rb atoms. When heated up to temperatures around 350 \(^\circ \)C, the vapor in the cell consists of: (i) Cs atoms, (ii) an order of magnitude lower concentration \(\hbox {Cs}_2\) dimers and (iii) a small number of Rb atoms. This mixture is a high density but optically thin alkali vapor layer, and the produced complex ensemble of \(\hbox {Cs}_2\) diatomic molecules, together with Rubidium and Cesium atoms can be investigated by means of linear/nonlinear spectroscopy. In this work we study the fluorescence and selective reflection spectral profiles of Rb atoms in the presence of high-density Cs atoms considered as a buffer gas for the Rb atoms and Cs dimers. In addition, the Rb hyperfine transition spectrum is used as a precise frequency reference for the measurement of the spectral profile widths and the frequency positions of the experimentally registered spectral lines of \(\hbox {Cs}_2\) molecules in the spectral region around the Rb \(\hbox {D}_2\) resonance line.
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Acknowledgements
This work was supported by the National Science Fund of Bulgaria according to contracts: (i) DO08-19/2016 New coherent and cooperative effects in hot alkali vapor and (ii) Bilateral project Bulgaria Russia (Nonlinear spectroscopy of spatially restricted alkali vapor: methodology and applications): DNTS/Russia 01/5 from 23.06.2017 + RFBR Grant No 17-52-18037, the Government of Russian Federation (Grant 08-08), as well as the Ministry of Science and Higher Education of the Russian Federation, goszadanie \(\#\)3.4903.2017/6.7.
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This article is part of the Topical Collection on Fundamentals of Laser Assisted Micro- & Nanotechnologies.
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Todorov, P., Vartanyan, T., Andreeva, C. et al. High resolution laser spectroscopy of spatially restricted hot alkali atomic and dimer vapor. Opt Quant Electron 52, 148 (2020). https://doi.org/10.1007/s11082-020-2258-1
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DOI: https://doi.org/10.1007/s11082-020-2258-1