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Tunable and Polarization-Controlled High-Contrast Bright and Dark Coherent Resonances in Potassium

  Articoli su Riviste JCR/ISI  (anno 2017)

Autori:  Gozzini S., Fioretti A., Lucchesini A., Marinelli C., Marmugi L., Tsvetkov S., Gateva S

Affiliazione Autori:  Istituto Nazionale di Ottica, INO-CNR, SS Pisa, Via Moruzzi 1, 56124 Pisa, Italy Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK Department of Physical Sciences, Earth and Environment, Università di Siena, via Roma 56, 53100 Siena, Italy Institute of Electronics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd., 1784 Sofia, Bulgaria

Riassunto:  We demonstrate high-contrast electromagnetically induced absorption (EIA) bright resonances on the D1 line of 39K 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.

Rivista/Giornale:  OPTICS LETTERS
Volume n.:  42      Pagine da: 2930  a: 2933
Ulteriori informazioni:  Editor's pick
Parole chiave: Coherent optical effects - Line shapes and shifts; - Hanle effect
DOI: 10.1364/OL.42.002930


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