Effect of electromagnetically induced transparency delay generated by dynamic coherent population trapping in Rb vapour

2016 ◽  
Author(s):  
Daba Radnatarov ◽  
Sergey Khripunov ◽  
Sergey Kobtsev ◽  
Alexey Taichenachev ◽  
Valeriy Yudin ◽  
...  
Keyword(s):  
Electromagnetically Induced Transparency ◽  
Coherent Population Trapping ◽  
Induced Transparency ◽  
Population Trapping

scholarly journals Coherent Population Trapping Resonances in Cs Atomic Vapor Layers of Micrometric Thickness

2011 ◽  
Vol 2011 ◽  
pp. 1-11 ◽  
Author(s):  
A. Krasteva ◽  
D. Slavov ◽  
S. Cartaleva
Keyword(s):  
Excited State ◽  
Light Intensity ◽  
Electromagnetically Induced Transparency ◽  
Elastic Interaction ◽  
Coherent Population Trapping ◽  
Sign Reversal ◽  
Resonance Amplitude ◽  
Electromagnetically Induced Absorption ◽  
Induced Transparency ◽  
Population Trapping

We report on a novel behavior of the electromagnetically induced absorption (EIA) resonance observed on theD2line of Cs for atoms confined in cells with micrometric thickness. With the enhancement of light intensity, the EIA resonance amplitude suffers from fast reduction, and even at very low intensity (W < 1 mW/cm2), resonance sign reversal takes place and electromagnetically induced transparency (EIT) resonance is observed. Similar EIA resonance transformation to EIT one is not observed in conventional cm-size cells. A theoretical model is proposed to analyze the physical processes behind the EIA resonance sign reversal with light intensity. The model involves elastic interactions between Cs atoms as well as elastic interaction of atom micrometric-cell windows, both resulting in depolarization of excited state which can lead to the new observations. The effect of excited state depolarization is confirmed also by the fluorescence (absorption) spectra measurement in micrometric cells with different thicknesses.

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