High performance vapour-cell frequency standards
Résumé We report our investigations on a compact high-performance rubidium (Rb) vapour-cell clock based on microwave-optical double-resonance (DR). These studies are done in both DR continuous-wave (CW) and Ramsey schemes using the same Physics Package (PP), with the same Rb vapour cell and a magnetron-type cavity with only 45 cm3 external volume. In the CW-DR scheme, we demonstrate a DR signal with a contrast of 26% and a linewidth of 334 Hz; in Ramsey-DR mode Ramsey signals with higher contrast up to 35% and a linewidth of 160 Hz have been demonstrated. Short-term stabilities of 1.4×10^-13 τ^-1/2 and 2.4×10^-13 τ^-1/2 are measured for CW-DR and Ramsey-DR schemes, respectively. In the Ramsey-DR operation, thanks to the separation of light and microwave interactions in time, the light-shift effect has been suppressed which allows improving the long-term clock stability as compared to CW-DR operation. Implementations in miniature atomic clocks are considered.
Mots-clés Atomic clocks, Rubidium, vapour-cells, frequency standards, Ramsey scheme.
Citation M. Gharavipour, et al., "High performance vapour-cell frequency standards," in 8th Symposium on Frequency Standards and Metrology 2015, Potsdam, Allemagne, 2015, p. 012001.
Type Actes de congrès (Anglais)
Nom de la conférence 8th Symposium on Frequency Standards and Metrology 2015 (Potsdam, Allemagne)
Date de la conférence 27-10-2015
Editeur commercial Journal of Physics: Conference Series 723
Pages 012001
URL http://iopscience.iop.org/article/10.1088/1742-6596/723/1...