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Affolderbach, Christoph
Nom
Affolderbach, Christoph
Affiliation principale
Fonction
Collaborateur scientifique
Email
christoph.affolderbach@unine.ch
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Résultat de la recherche
19 Résultats
Voici les éléments 1 - 10 sur 19
- PublicationAccès libreA Microcell Atomic Clock Based on a Double-Resonance Ramsey Scheme(2022)
; ; ; ; ;Maddalena Violetti ;Yuanyan Su ;Anja K. Skrivervik - PublicationAccès libre3D printed microwave cavity for atomic clock applications: proof of concept(2018-6-7)
; ; ; ;Skrivervik, A.K. ;Ivanov, A.E. ;Debogovic, T.de Rijk, E.The authors present the realisation and characterisation of an additively manufactured (AM) microwave resonator cavity for double-resonance (DR) vapour-cell atomic clocks. The design of the compact microwave cavity is based on the loop-gap resonator approach, previously demonstrated for conventionally-machined aluminium components. In the present study, the resonator is fabricated by AM using a metal-coated polymer. A resonance frequency at the desired 6.835 GHz rubidium atomic frequency is obtained. When employed in an atomic clock setup, the AM cavity enables a DR signal of <;500 Hz linewidth and of nearly 20% contrast, thus fulfilling the stringent requirements for DR atomic clocks. A clock short-term stability of 1 × 10 -12 τ -1/2 is demonstrated, comparable to state-of-the-art clock performances. - 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 libreLow-temperature indium-bonded alkali vapor cell for chip-scale atomic clocks(2013-11-9)
;Straessle, Rahel; ; ;Pétremand, Yves ;Briand, Danick; De Rooij, Nicolaas-F. - PublicationAccès libreImaging of relaxation times and microwave field strength in a microfabricated vapor cell(2013-11-9)
;Horsley, Andrew ;Du, Guan-Xiang; ; ; Treutlein, Philipp - PublicationAccès libreStudy of laser-pumped double-resonance clock signals using a microfabricated cell(2012-11-9)
; ; ;Pétremand, Yves ;De Rooij, Nicolaas-F. - PublicationAccès libreMicrofabricated rubidium vapour cell with a thick glass core for small-scale atomic clock applications(2012-11-9)
;Pétremand, Yves; ;Straessle, Rahel; ;Briand, Danick; De Rooij, Nicolaas-F. - PublicationAccès libreCompact microwave cavity for high performance rubidium frequency standards(2012-11-9)
; ;Bandi, Thejesh ;Merli, Francesco; ; ; Skrivervik, Anja K. - PublicationAccès libreMicrofabricated alkali vapor cell with anti-relaxation wall coating
;Straessle, Rahel; ; ;Pétremand, Yves ;Briand, Danick; de Rooij, Nicolas F.We present a microfabricated alkali vapor cell equipped with an anti-relaxation wall coating. The anti-relaxation coating used is octadecyltrichlorosilane and the cell was sealed by thin-film indium-bonding at a low temperature of 140 °C. The cell body is made of silicon and Pyrex and features a double-chamber design. Depolarizing properties due to liquid Rb droplets are avoided by confining the Rb droplets to one chamber only. Optical and microwave spectroscopy performed on this wallcoated cell are used to evaluate the cell’s relaxation properties and a potential gas contamination. Double-resonance signals obtained from the cell show an intrinsic linewidth that is significantly lower than the linewidth that would be expected in case the cell had no wall coating but only contained a buffer-gas contamination on the level measured by optical spectroscopy. Combined with further experimental evidence this proves the presence of a working anti-relaxation wall coating in the cell. Such cells are of interest for applications in miniature atomic clocks, magnetometers, and other quantum sensors. - PublicationAccès libreThe Microloop-Gap Resonator: A Novel Miniaturized Microwave Cavity for Double-Resonance Rubidium Atomic Clocks
;Violetti, Maddalena; ; ;Merli, Francesco ;Zürcher, Jean-François; Skrivervik, Anja KNowadays mobile and battery-powered applications push the need for radically miniaturized and low-power frequency standards that surpass the stability achievable with quartz oscillators. For the miniaturization of double-resonance rubidium (87Rb) atomic clocks, the size reduction of the microwave cavity or resonator (MWR) to well below the wavelength of the atomic transition (6.835 GHz for 87Rb) is of high interest. Here, we present a novel miniaturized MWR, the µ-LGR, for use in a miniature DR atomic clock and designed to apply a well-defined microwave field to a microfabricated Rb cell that provides the reference signal for the clock. This µ-LGR consists of a loop-gap resonator-based cavity with very compact dimensions (<0.9 cm3). The µ-LGR meets the requirements of the application and its fabrication and assembly can be performed using repeatable and low-cost techniques. The concept of the proposed device was proven through simulations, and prototypes were successfully tested. Experimental spectroscopic evaluation shows that the µ-LGR is well-suited for use in an atomic clock. In particular, a clock short-term stability of 7 × 10-12τ-1/2 was measured, which is better than for other clocks using microfabricated cells and competitive with stabilities of compact Rb clocks using conventional glass-blown cells.