I.Yu. Blinov, A.F. Kurchanov, V.V. Pyavkina, A.S. Salnikov

FSUE “VNIIFTRI”, Mendeleevo, Moscow region
blinov@vniiftri.ru,
kurchanov@vniiftri.ru,
vvb@vniiftri.ru,
salnikov@vniiftri.ru

Al’manac of Modern Metrology № 3 (23) 2020, pages 115–127

The dependences of the amplitude of the CPT effect discriminator on the laser wavelength were experimentally obtained, allowing choosing the optimal wavelength corresponding to the maximum steepness of the quantum discriminator both for cells with a natural mixture of rubidium (Rb) isotopes and with isotopically pure Rb⁸⁷. It was found that in a cell with natural Rb the expressed maximum of the discriminator amplitude corresponds to the laser wavelength, which does not coincide with the peak of the D₁ line in the absorption spectrum of the Rb⁸⁷ isotope (in the presence of microwave modulation of the laser wavelength). It was revealed that the laser wavelength corresponding to the maximum of the discriminator amplitude approximately coincides with the inflection point in the absorption spectrum in the cell with natural Rb, which is fundamentally different from the cell with Rb⁸⁷. The features of the manufacturing technology of cells with natural rubidium are described, the possibility of creating a small-sized quantum frequency standard on that basis, which can be important in serial production, is discussed.

Key words: coherent population trapping, small-sized cell with natural rubidium, quantum frequency standard.

Full texts of articles are available only in Russian in printed issues of the magazine.