Transformation of electromagnetically induced transparency into absorption in thermal potassium optical cell with spin preserving coating
Authors: Gozzini S., Lucchesini A., Marinelli C., Marmugi L., Gateva S., Tsvetkov S., Cartaleva S.
Autors Affiliation: Istituto Nazionale di Ottica CNR – SS di Pisa, Via Moruzzi 1, 56124 Pisa, Italy
Department of Physical, Geological and Environmental Science, University of Siena, via Roma 56, 53100 Siena, Italy
Institute of Electronics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee , 1784 Sofia, Bulgaria
Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom
Abstract: We report a new experimental approach where an order of magnitude enhancement of the electromagnetically induced absorption (EIA) resonance contrast, thus making it similar to that of the EIT resonance contrast is observed under the same conditions. The EIA signal results from the interaction of a weak probe beam with a ground state that has been driven by the pump (counter-propagating) beam. Probe absorption spectra are presented where the laser frequency is slowly detuned over the D1 line of 39K vapor contained in a cell with a PDMS antirelaxation coating. In addition to the frequency detuning, a magnetic field orthogonal to the laser beams is scanned around zero value at a higher rate. With both laser beams linearly polarized, an EIT resonance is observed. However, changing the pump beam polarization from linear to circular reverses the resonance signal from EIT to EIA.
Journal/Review: JOURNAL OF PHYSICS. CONFERENCE SERIES
Volume: 700 Pages from: 012051-1 to: 012051-6
More Information: doi: 10.1088/1742-6596/700/1/012051
M.C.M. van de Sanden, M. Dimitrova, C. Ghelev Editors.KeyWords: Electromagnetically induced transparency; Coherent control of atomic interactions; Quantum description of interaction of li; potassium;