High performance vapour-cell frequency standards

8th Symposium on Frequency Standards and Metrology 2015

Gharavipour, M.^1 ; Affolderbach, C.^1 ; Kang, S.^1 ; Bandi, T.^1 ; Gruet, F.^1 ; Pellaton, M.^1 ; Mileti, G.^1

Laboratoire Temps-Fréquence, Institut de Physique, Université de Neuchâtel, Switzerland^1

关键词: Clock stability;    Continuous waves;    Double resonance;    DR signals;    External volume;    Light shift;    Microwave interactions;    Short term stability;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/723/1/012006/pdf
DOI  :  10.1088/1742-6596/723/1/012006

来源: IOP

【 摘 要 】

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 cm3external 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 1.4×10-13τ-1/2and 2.4×10-13τ-1/2are 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.