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

19th International Summer School on Vacuum, Electron and Ion Technologies

Gozzini, S.^1 ; Lucchesini, A.^1 ; Marinelli, C.^2 ; Marmugi, L.^4 ; Gateva, S.^3 ; Tsvetkov, S.^3 ; Cartaleva, S.^3

Istituto Nazionale di Ottica CNR, UOS Pisa, Via Moruzzi 1, Pisa

56124, Italy^1

Department of Physical, Geological and Environmental Science, University of Siena, via Roma 56, Siena

53100, Italy^2

Emil Djakov Institute of Electronics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee, Sofia

1784, Bulgaria^3

INO, Department of Physics and Astronomy, University College London, Gower Street, London

WC1E 6BT, United Kingdom^4

关键词: Counterpropagating;    Electromagnetically induced absorption;    Electromagnetically-induced transparency;    Experimental approaches;    Frequency detuning;    Linearly polarized;    Magnitude enhancement;    Resonance signals;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/700/1/012051/pdf
DOI  :  10.1088/1742-6596/700/1/012051

来源: IOP

【 摘 要 】

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 D1line of39K 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.