scholarly journals Electromagnetically induced transparency with Rydberg atoms across the Breit-Rabi regime

2017 ◽  
Vol 2 (2) ◽  
Author(s):  
Julian Naber ◽  
Atreju Tauschinsky ◽  
Ben van Linden van den Heuvell ◽  
Robert Spreeuw
Keyword(s):  
Magnetic Fields ◽  
Electromagnetically Induced Transparency ◽  
Level Structure ◽  
Laser Beams ◽  
Optical Bloch Equations ◽  
Angular Momenta ◽  
Low Field ◽  
Multi Level ◽  
Atomic States ◽  
Induced Transparency

We present experimental results on the influence of magnetic fields and laser polarization on electromagnetically induced transparency (EIT) using Rydberg levels of ^{87}87Rb atoms. The measurements are performed in a room temperature vapor cell with two counter-propagating laser beams at 480 m and 780 m in a ladder-type energy level scheme. We measure the EIT spectrum of a range of ns_{1/2}ns1/2 Rydberg states for n=19-27n=19−27, where the hyperfine structure can still be resolved. Our measurements span the range of magnetic fields from the low field linear Zeeman regime to the high field Paschen-Back regimes. The observed spectra are very sensitive to small changes in magnetic fields and the polarization of the laser beams. We model our observations using optical Bloch equations that take into account the full multi-level structure of the atomic states involved and the decoupling of the electronic JJ and nuclear II angular momenta in the Breit-Rabi regime. The numerical model yields excellent agreement with the observations. In addition to EIT related experiments, our results are relevant for experiments involving coherent excitation to Rydberg levels in the presence of magnetic fields.

Higher order nonlinearities in a non-Doppler free geometryThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at University of Windsor, Windsor, Ontario, Canada on 21–26 July 2008.

2009 ◽  
Vol 87 (7) ◽  
pp. 843-850 ◽  
Author(s):  
Andal Narayanan ◽  
Archana Sharma ◽  
T. M. Preethi ◽  
H. Abheera ◽  
Hema Ramachandran
Keyword(s):  
Electromagnetically Induced Transparency ◽  
Level Density ◽  
Kerr Nonlinearity ◽  
Low Light ◽  
Atomic Systems ◽  
Fourth Level ◽  
All Optical ◽  
Multi Level ◽  
Induced Transparency ◽  
Photon Resonance

Multi-level gaseous atomic systems showing electromagnetically induced transparency (EIT) phenomenon also exhibit low light intensity nonlinear optical phenomena. This is primarily due to the supression of linear susceptibility for the probe light during EIT. Therefore under EIT, nonlinear interactions become appreciable even at very low light intensities. In particular, Kerr nonlinearity in N systems irradiated by three fields has been both experimentally and theoretically investigated. In this paper, we report an all optical observation of an absorptive three-photon resonance feature, of subnatural width, in a N level scheme of gaseous rubidium, at room temperature, in a novel geometry of three independent beams. The non-Doppler free configuration of the beam in which the absorption is seen is the first such feature reported in a beam that is not directly taking part in the transparency effect. We have demonstrated the velocity selective nature of this absorption and studied the contrast dependence on detuning from the fourth level. Density matrix calculations have been carried out for this geometry, the results of which are in qualitative agreement with the experiment.

scholarly journals Determine Dispersion Coefficient of 85Rb Atom in the Y–Configuration

2019 ◽  
Vol 35 (2) ◽  
Author(s):  
Nguyen Tien Dung
Keyword(s):  
Laser Beam ◽  
Dispersion Coefficient ◽  
Electromagnetically Induced Transparency ◽  
Laser Beams ◽  
Probe Laser ◽  
Frequency Detuning ◽  
Coupling Laser ◽  
85Rb Atom ◽  
Probe Laser Beam ◽  
Induced Transparency

Abstract: In this work, we derive analytical expression for the dispersion coefficient of 85Rb atom for a weak probe laser beam induced by a strong coupling laser beams. Our results show possible ways to control dispersion coefficient by frequency detuning and of the coupling lasers. The results show that a Y-configuration appears two transparent window of the dispersion coefficient for the probe laser beam. The depth and width or position of these windows can be altered by changing the intensity or frequency detuning of the coupling laser fields. Keywords: Electromagnetically induced transparency, dispersion coefficient.

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