Tunable and polarization-controlled high-contrast bright and dark coherent resonances in potassium

Year: 2017

Authors: Gozzini, S; Fioretti, A; Lucchesini, A; Marmugi, L; Marinelli, C; Tsvetkov, S; Gateva, S; Cartaleva, S

Autors Affiliation: CNR, INO, SS Pisa, Via Moruzzi 1, I-56124 Pisa, Italy; UCL, Dept Phys & Astron, Gower St, London WC1E 6BT, England; Univ Siena, Dept Phys Sci Earth & Environm, Via Roma 56, I-53100 Siena, Italy; Bulgarian Acad Sci, Inst Elect, 72 Tzarigradsko Chaussee Blvd, BU-1784 Sofia, Bulgaria.

Abstract: We demonstrate high-contrast electromagnetically induced absorption (EIA) bright resonances on the D-1 line of K-39 with characteristics comparable to those of the electromagnetically induced transparency (EIT) dark resonances observed in the same conditions. EIA is produced by the interaction of a weak probe beam with the atomic ground state driven in a degenerate coherent superposition by either a co- or counter-propagating pump beam. We have obtained an order of magnitude increase of the EIA´s contrast with respect to previous similar experiments, performed with other alkalis, without compromising its linewidth. Furthermore, we show that the magneto-optic resonances can be continuously tuned from EIT to EIA by changing the relative handedness of circular polarizations of pump and probe beams, or depending on whether they co- or counter-propagate. This opens new perspectives in the use of EIA in a broad range of physical domains and in a large wealth of potential applications in optics and photonics.

Journal/Review: OPTICS LETTERS

Volume: 42      Pages from: 2930  to: 2933

More Information: Seventh Framework Programme (FP7) (PIRSES-GA-2012-295264); Consiglio Nazionale delle Ricerche (CNR) and Bulgarian Academy of Sciences (BAS) (CNR/BAS 2013-2015); Bulgarian National Science Fund (BNSF) (DN08-19/14.12.2016).
KeyWords: Coherent optical effects; Line shapes and shifts; Zeeman effect
DOI: 10.1364/OL.42.002930

Citations: 24
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