dorsal/arxiv
View SchemaCold atom Clocks and Applications
| Authors | S. Bize, P. Laurent, M. Abgrall, H. Marion, I. Maksimovic, L. Cacciapuoti, J. Gruenert, C. Vian, F. Pereira dos Santos, P. Rosenbusch, P. Lemonde, G. Santarelli, P. Wolf, A. Clairon, A. Luiten, M. Tobar, C. Salomon |
|---|---|
| Categories | |
| ArXiv ID | physics/0502117 |
| URL | https://arxiv.org/abs/physics/0502117 |
| DOI | 10.1088/0953-4075/38/9/002 |
Abstract
This paper describes advances in microwave frequency standards using laser-cooled atoms at BNM-SYRTE. First, recent improvements of the $^{133}$Cs and $^{87}$Rb atomic fountains are described. Thanks to the routine use of a cryogenic sapphire oscillator as an ultra-stable local frequency reference, a fountain frequency instability of $1.6\times 10^{-14}\tau^{-1/2}$ where $\tau $ is the measurement time in seconds is measured. The second advance is a powerful method to control the frequency shift due to cold collisions. These two advances lead to a frequency stability of $2\times 10^{-16}$ at $50,000s for the first time for primary standards. In addition, these clocks realize the SI second with an accuracy of $7\times 10^{-16}$, one order of magnitude below that of uncooled devices. In a second part, we describe tests of possible variations of fundamental constants using $^{87}$Rb and $^{133}$Cs fountains. Finally we give an update on the cold atom space clock PHARAO developed in collaboration with CNES. This clock is one of the main instruments of the ACES/ESA mission which is scheduled to fly on board the International Space Station in 2008, enabling a new generation of relativity tests.
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"abstract": "This paper describes advances in microwave frequency standards using\nlaser-cooled atoms at BNM-SYRTE. First, recent improvements of the $^{133}$Cs\nand $^{87}$Rb atomic fountains are described. Thanks to the routine use of a\ncryogenic sapphire oscillator as an ultra-stable local frequency reference, a\nfountain frequency instability of $1.6\\times 10^{-14}\\tau^{-1/2}$ where $\\tau $\nis the measurement time in seconds is measured. The second advance is a\npowerful method to control the frequency shift due to cold collisions. These\ntwo advances lead to a frequency stability of $2\\times 10^{-16}$ at $50,000s\nfor the first time for primary standards. In addition, these clocks realize the\nSI second with an accuracy of $7\\times 10^{-16}$, one order of magnitude below\nthat of uncooled devices. In a second part, we describe tests of possible\nvariations of fundamental constants using $^{87}$Rb and $^{133}$Cs fountains.\nFinally we give an update on the cold atom space clock PHARAO developed in\ncollaboration with CNES. This clock is one of the main instruments of the\nACES/ESA mission which is scheduled to fly on board the International Space\nStation in 2008, enabling a new generation of relativity tests.",
"arxiv_id": "physics/0502117",
"authors": [
"S. Bize",
"P. Laurent",
"M. Abgrall",
"H. Marion",
"I. Maksimovic",
"L. Cacciapuoti",
"J. Gruenert",
"C. Vian",
"F. Pereira dos Santos",
"P. Rosenbusch",
"P. Lemonde",
"G. Santarelli",
"P. Wolf",
"A. Clairon",
"A. Luiten",
"M. Tobar",
"C. Salomon"
],
"categories": [
"physics.atom-ph"
],
"doi": "10.1088/0953-4075/38/9/002",
"title": "Cold atom Clocks and Applications",
"url": "https://arxiv.org/abs/physics/0502117"
},
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