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Parametric Study of CPT Resonance in Rubidium Vapor Cell for Application in Atomic Clock

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Title Parametric Study of CPT Resonance in Rubidium Vapor Cell for Application in Atomic Clock
 
Creator Kaitha, Rajaiah
R, Manjula
Tiwari, Pragya
Kappen, Minni J
Biswas, Shubhajit
Raha, Bijoy
Pradhan, Swarupananda
Tumu, Venkatappa Rao
S B, Umesh
S, Elumalai
Arvind P, Kalpana
K V, Sriram
Upadhya, Prashanth C
 
Subject Atomic clock
Coherent Population Trapping
Quality figure
Frequency stability
Wall collision
Propagation effect
 
Description 489-496
The performance of Coherent Population Trapping (CPT) based atomic clocks primarily depends on the characteristics of CPT resonance. We have performed experiments to study and optimize the characteristics of CPT resonance in 87Rb atoms by measuring its contrast and full-width-at-half maximum (FWHM) as function of laser excitation and temperature of atomic vapor cells with different dimensions. A four-level atomic model is used to simulate CPT resonance characteristics along the length of atomic vapor cell. The model incorporates scaling law to understand collision dynamics in cells with different radius for a range of laser excitation intensities and the results are compared with experimental data. The quality figure, calculated from the measured values of FWHM and contrast, decreases with increase in laser intensity and improves in cells with higher dimension (radius). The optimum temperature corresponding to maximum quality figure varies with laser excitation intensity as well as cell dimension. The underlying collision dynamics and density effects that are responsible for the observed resonance characteristics are discussed.
 
Date 2022-06-10T06:47:59Z
2022-06-10T06:47:59Z
2022-06
 
Type Article
 
Identifier 0975-0959 (Online); 0301-1208 (Print)
http://nopr.niscpr.res.in/handle/123456789/59880
 
Language en
 
Publisher NIScPR-CSIR, India
 
Source IJPAP Vol.60(06) [June 2022]