8th Symposium on Frequency Standards and Metrology 2015 | |
High performance vapour-cell frequency standards | |
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 |
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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.
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High performance vapour-cell frequency standards | 787KB | download |