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Journal Radioengineering №12 for 2016 г.
Article in number:
Analize of short-term stability and ligt shifts of quantum frequency standards based on coherent population trapping effect in 87Rb buffer cell
Keywords: quantum frequency standards coherent population trapping buffer gas short-term stability
Authors:
K.A. Barantsev - Post-graduate Student, Assistant, Peter The Great St.Petersburg Polytechnic University E-mail: kostmann@yandex.ru E.N. Popov - Ph. D. (Phys.-Math.), Research Scientist, Senior Lecturer, Peter The Great St.Petersburg Polytechnic University E-mail: enp-tion@ya.ru A.N. Litvinov - Ph. D. (Phys.-Math.), Senior Research Scientist, Associate Professor, Peter The Great St.Petersburg Polytechnic University E-mail: andrey.litvinov@mail.ru V.M. Petrov - Dr. Sc. (Phys.-Math.), Head of Department, Peter The Great St.Petersburg Polytechnic University E-mail: vikpetroff@mail.ru
Abstract:
The theory of the physical part of quantum frequency standard based on coherent population trapping (CPT) resonance in 87Rb atoms in gas cell was built in this work. Considered theoretical model takes into account absorption of the radiation in the medium of active atoms, hyperfine and Zeeman structure of 87Rb atoms, polarization and finite width of spectra of the laser radiation and influence of the bufer gas on the processes of excitation of active atoms. Under this theory we made calculations short-term stability of the physical part of the quantum frequency standard, based on CPT-resonance, depending on optical thickness of the cell, intensity and width of spectra of the laser radiation. The parameters, which provide the short-term stability of quantum frequency standard on the level 10−14 per one second, were determined. Dependence of the light shift of the CPT-resonance on optical thickness and temperature of the cell was analized. It was found that the light shift can be supressed by optical thickness changing with a specific ratio of the intensities of the spectral components of radiation in the input of the cell.
Pages: 164-170
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