Transformation of electromagnetically induced transparency into absorption in a thermal potassium optical cell with spin preserving coating

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 w...

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Bibliographic Details
Published in:Journal of physics. Conference series 2016-03, Vol.700 (1), p.12051
Main Authors: Gozzini, S, Lucchesini, A, Marinelli, C, Marmugi, L, Gateva, S, Tsvetkov, S, Cartaleva, S
Format: Article
Language:English
Subjects:
Absorption spectra
Laser beams
Lasers
Linear polarization
Physics
Resonance
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Summary: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.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/700/1/012051