Switching atomic fountain clock microwave interrogation signal and high-resolution phase measurements

Santarelli, G.; Governatori, G.; Chambon, D.; Lours, M.; Rosenbusch, P.; Guéna, Jocelyne; Chapelet, F.; Bize, S.; Tobar, Michael E.; Laurent, P.; Potier, T.; Clairon, A.

doi:10.1109/tuffc.2009.1188

Cited by 42 publications

(45 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The test is repeated from time to time at the nominal power. We also occasionally (once a year) analyze the interrogation signal using a dedicated triggered phase transient analyzer with microradian resolution [58]. Both phase transients associated with the switching of the microwave and with phase perturbations synchronous with the fountain cycle can be addressed.…”

Section: F Microwave Leakage and Spectral Puritymentioning

confidence: 99%

Contributing to TAI with a secondary representation of the SI second

et al. 2014

View full text Add to dashboard Cite

Abstract-We report the first contribution to the international atomic time (TAI) based on a secondary representation of the SI second. This work is done with the LNE-SYRTE FO2-Rb fountain frequency standard using the 87 Rb ground state hyperfine transition. We describe FO2-Rb and how it is connected to local and international time scales. We report on local measurements of this frequency standard in the SI system, i.e. against primary frequency standards, down to a fractional uncertainty of 4.4 × 10 −16 , and on the establishment of the recommended value for the 87 Rb hyperfine transition by the CIPM. We also report on the process that led to the participation of the FO2-Rb frequency standard to Circular T and to the elaboration of TAI. This participation enables us to demonstrate absolute frequency measurement directly in terms of the SI second realized by the TAI ensemble with a statistical uncertainty of 1.1 × 10 −16 , therefore at the limit allowed by the accuracy of primary frequency standards. This work constitutes a demonstration of how other secondary representations, based on optical transitions, could also be used for TAI, and an investigation of a number of issues relevant to a future redefinition of the SI second.

show abstract

Section: F Microwave Leakage and Spectral Puritymentioning

confidence: 99%

Contributing to TAI with a secondary representation of the SI second

et al. 2014

View full text Add to dashboard Cite

show abstract

“…Finally, the synthesized microwave of 9.19263177 GHz is sent to the atomic fountain. For pulsed microwave operation in the fountain, an interferometer switch [23] is used. The microwave signal delivered to the fountain is switched by switching the 100-MHz signal as shown in Fig.…”

Section: B Qpn-limited Operation Of the Atomic Fountain Clockmentioning

confidence: 99%

Drift-Compensated Low-Noise Frequency Synthesis Based on a cryoCSO for the KRISS-F1

Heo

Park

Lee

et al. 2016

IEEE Trans. Instrum. Meas.

View full text Add to dashboard Cite

“…We developed microwave synthesizers that can be switched without introducing phase transients and a phase transient analyzer with 1 µrad.s −1 resolution [19]. Using these tools, we lowered the uncertainty related to these putative frequency shifts to less than 10 −16 .…”

Section: Atomic Fountainsmentioning

confidence: 99%

Atomic fountains and optical clocks at SYRTE: Status and perspectives

Abgrall

Chupin

Sarlo

et al. 2015

Comptes Rendus. Physique

View full text Add to dashboard Cite

In this article, we report on the work done with the LNE-SYRTE atomic clock ensemble during the last 10 years. We cover progress made in atomic fountains and in their application to timekeeping. We also cover the development of optical lattice clocks based on strontium and on mercury. We report on tests of fundamental physical laws made with these highly accurate atomic clocks. We also report on work relevant to a future possible redefinition of the SI second. IntroductionResearch on highly accurate atomic frequency standards and their applications is making fast and steady progress. The quest for ever increased accuracy is advancing hand in hand with advances in quantum physics, with better understanding and manipulation of atomic systems, with exploration of fundamental laws of nature and with the development of important services and infrastructures for science and society. The quest for increased accuracy is also a powerful incentive to innovation in such areas as lasers, laser stabilization, low noise electronics, stable oscillators, low noise detection of optical signals, fiber devices and cold-atom based instrumentation for ground or space applications. Finally, in addition to enhancing existing applications, improved accuracy leads to new applications.This article focuses on key achievements and trends of the last 10 years. Over this period of time, the first generation of laser-cooled standards, using the atomic fountain geometry, reached maturity and had large impact on international timekeeping. The typical accuracy of these frequency standards, 2 parts in 10 16 , is now permanently accessible both locally and globally. At the same time, a new generation of optical clocks showed tremendous and steady improvement, gaining more than two orders of magnitude in a decade. To date, an accuracy of 6.4 × 10 −18 [1] was reported. Similarly, major improvements occurred in many other aspects of optical frequency metrology, notably in optical frequency combs and optical fiber links.In this article, we will report on developments of the LNE-SYRTE atomic clock ensemble since our 2004 report in the Special Issue of the Comptes Rendus de l'Académie des sciences on Fundamental Metrology [2]. This work exemplifies many of the above mentioned features of research on highly accurate atomic frequency standards. We will focus on frequency standards and their impact on timescales and timekeeping, on clock comparisons, including optical-to-microwave comparisons with combs, and their applications. Several

show abstract

Switching atomic fountain clock microwave interrogation signal and high-resolution phase measurements

Cited by 42 publications

References 28 publications

Contributing to TAI with a secondary representation of the SI second

Contributing to TAI with a secondary representation of the SI second

Drift-Compensated Low-Noise Frequency Synthesis Based on a cryoCSO for the KRISS-F1

Atomic fountains and optical clocks at SYRTE: Status and perspectives

Contact Info

Product

Resources

About