Abstract
We present experimental investigation on the fluorescence profiles observed by excitation of the hyperfine transitions of the second resonance line of potassium with a wavelength of 404.4 nm in dependence on the atomic density. This leads to both direct decay of the excited level population to the ground state (violet fluorescence), and to cascade decay via the first resonance lines (infrared fluorescence). It has been shown that the behavior of these two fluorescence profiles is different: increasing the atomic density, the violet fluorescence profile exhibits a well-pronounced self-absorption dip, while the infrared line does not show any narrow-width reduced absorption structure. Moreover, the profiles of the infrared line have a higher signal-to-noise ratio than that of the violet line. Our investigations show that beside atomic population, atomic polarization is also transferred by the cascade transitions. This is evidenced by registration of coherent magneto-optical resonances at the two fluorescence lines. The signal-to-noise ratio of these resonances registered at the first resonance line is significantly higher than at those obtained at the second resonance line. The proposed study makes it possible to examine cascade transitions in alkali atoms, particularly the preservation of atomic polarization, i.e. the coherence transfer by cascade transitions.
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Acknowledgements
This work was funded by the National Scientific Fund of Bulgaria, Grants DO08-19/2016, “New coherent and cooperative effects in hot alkali vapour” and DNTS/Russia 01/5/23.06.2017, “Nonlinear spectroscopy of spatially restricted alkali vapour: methodology and applications”. ST and SG acknowledge the Bulgarian Academy of Sciences for the funding within Grant DFNP-17-76/2017. The authors are also grateful to Julia Fagan for proof-reading the manuscript.
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This article is part of the Topical Collection on Focus on Optics and Bio-photonics, Photonica 2017.
Guest Edited by Jelena Radovanovic, Aleksandar Krmpot, Marina Lekic, Trevor Benson, Mauro Pereira, Marian Marciniak.
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Andreeva, C., Krasteva, A., Markovski, A. et al. Excitation transfer from second to first resonance line of potassium observed in hot atomic vapor. Opt Quant Electron 50, 213 (2018). https://doi.org/10.1007/s11082-018-1474-4
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DOI: https://doi.org/10.1007/s11082-018-1474-4