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Pellaton, Matthieu
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Pellaton, Matthieu
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19 Résultats
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- PublicationAccès libreA Microcell Atomic Clock Based on a Double-Resonance Ramsey Scheme(2022)
; ; ; ; - PublicationAccès libre3D printed microwave cavity for atomic clock applications: proof of concept(2018-6-7)
; ; ; - PublicationAccès libreHigh performance vapour-cell frequency standardsWe 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.
- PublicationAccès libreImaging of relaxation times and microwave field strength in a microfabricated vapor cell(2013-11-9)
; ; ; Treutlein, Philipp - PublicationAccès libreLow-temperature indium-bonded alkali vapor cell for chip-scale atomic clocks(2013-11-9)
; ; ; De Rooij, Nicolaas-F. - PublicationAccès libreCompact microwave cavity for high performance rubidium frequency standards(2012-11-9)
; ; ; ; Skrivervik, Anja K. - PublicationAccès libreMicrofabricated rubidium vapour cell with a thick glass core for small-scale atomic clock applications(2012-11-9)
; ; ; De Rooij, Nicolaas-F. - PublicationAccès libreStudy of laser-pumped double-resonance clock signals using a microfabricated cell(2012-11-9)
; ; - PublicationAccès libreImpact of microwave-field inhomogeneity in an alkali vapour cell using Ramsey double-resonance spectroscopyWe numerically and experimentally evaluate the impact of the inhomogeneity of the microwave field in the cavity used to perform double-resonance (DR) Ramsey spectroscopy in a buffer gas alkali vapour cell. The Ramsey spectrum is numerically simulated using a simple theoretical model and taking into account the field distribution in a magnetron-type microwave resonator. An experimental evaluation is performed using a DR pulsed optically pumped (POP) atomic clock. It is shown that the sensitivity to the micro-wave power of the DR POP clock can be reproduced from the combination of two inhomogeneities across the vapour cell: microwave field inhomogeneity and atomic ground-state resonance frequency inhomogeneity. Finally, we present the existence of an optimum operation point for which the microwave power sensitivity of our DR POP clock is reduced by two orders of magnitude. It leads into a long-term frequency stability of 1 × 10-14.
- PublicationAccès libreCompact microwave cavity for high performance rubidium frequency standards
; ; ; ; ; Skrivervik, Anja K.The design, realization, and characterization of a compact magnetron-type microwave cavity operating with a TE011-like mode are presented. The resonator works at the rubidium hyperfine ground-state frequency (i.e., 6.835 GHz) by accommodating a glass cell of 25 mm diameter containing rubidium vapor. Its design analysis demonstrates the limitation of the loop-gap resonator lumped model when targeting such a large cell, thus numerical optimization was done to obtain the required performances. Microwave characterization of the realized prototype confirmed the expected working behavior. Double-resonance and Zeeman spectroscopy performed with this cavity indicated an excellent microwave magnetic field homogeneity: the performance validation of the cavity was done by achieving an excellent short-term clock stability as low as 2.4 × 10−13τ−1/2. The achieved experimental results and the compact design make this resonator suitable for applications in portable atomic high-performance frequency standards for both terrestrial and space applications.