Antirelaxation coatings in coherent spectroscopy: Theoretical investigation and experimental test

Year: 2015

Authors: Nasyrov K., Gozzini S., Lucchesini A., Marinelli C., Gateva S., Cartaleva S., Marmugi L.

Autors Affiliation: Institute of Automation and Electrometry SB RAS, Novosibirsk, Russia;
Istituto Nazionale di Ottica del CNR – UOS Pisa, Via Moruzzi 1, 56124 Pisa, Italy;
DSFTA, Universita’ di Siena, Via Roma 56, 53100 Siena, Italy;
Institute of Electronics, BAS, boul. Tzarigradsko shosse 72, 1784 Sofia, Bulgaria;
Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom.

Abstract: We describe a theoretical model, based on a density matrix and the Liouville equation, for the investigation of magneto-optical resonances in alkali-metal atomic vapor, in particular in the case of the electromagnetically induced transparency (EIT) in the presence of antirelaxation coatings. The influence of the coating is parametrized with an empirical coefficient describing its efficiency; the calculations are extended to a broad range of coating quality, contrary to previous works, and to uncoated cells. The model takes into account also different configurations for the EIT formation and different efficiency of optical pumping, as determined by the coating characteristics and the atomic energy structure. The model is validated by investigating the EIT with degenerate Zeeman levels in K-39 D-1 and Cs D-2 lines, which exhibit respectively an almost negligible and a relevant impact of hyperfine optical pumping. The results are compared to experimental data, exhibiting good agreement; in particular, for the K-39 D-1 line, recent findings are shown here in the case of degenerate and nondegenerate EIT with amplitude-modulated light. Our results demonstrate an effective approach for the investigation of antirelaxation coatings and their contribution in the formation of magneto-optical resonances in alkali-metal atoms, in different regimes and with largely different efficiencies. This sheds new light on well-known but not yet entirely clarified phenomena and their behavior as a function of experimental parameters.


Volume: 92 (4)      Pages from: 043803  to: 043803

More Information: This work was partially supported by the Bilateral Cooperation Agreement between the Italian National Council of Research (CNR) and the Bulgarian Academy of Sciences (BAS), Common projects 2013-2015 and Marie Curie International Research Staff Exchange Scheme Fellowship within the 7th European Community Framework Programme: “Coherent optics sensors for medical applications-COSMA” (Grant Agreement No. PIRSES-GA-2012-295264). L.M. was supported by an UCL Quantum Science and Technology Institute (UCLQ) Fellowship.
DOI: 10.1103/PhysRevA.92.043803

Citations: 25
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