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Cold atom clocks and applications

Identifieur interne : 00A319 ( Main/Exploration ); précédent : 00A318; suivant : 00A320

Cold atom clocks and applications

Auteurs : S. Bize [France] ; P. Laurent [France] ; M. Abgrall [France] ; H. Marion [France] ; I. Maksimovic [France] ; L. Cacciapuoti [France] ; J. Grnert [France] ; C. Vian [France] ; F Pereira Dos Santos [France] ; P. Rosenbusch [France] ; P. Lemonde [France] ; G. Santarelli [France] ; P. Wolf [France] ; A. Clairon [France] ; A. Luiten [Australie] ; M. Tobar [Australie] ; C. Salomon [France]

Source :

RBID : ISTEX:35B0F63C9E227184543EF23D585A57387EC6A29D

Descripteurs français

English descriptors

Abstract

This paper describes advances in microwave frequency standards using laser-cooled atoms at BNM-SYRTE. First, recent improvements of the 133Cs and 87Rb 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 1014 1/2 where 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 1016 at 50000 s for the first time for primary standards. In addition, these clocks realize the SI second with an accuracy of 7 1016, one order of magnitude below that of uncooled devices. In a second part, we describe tests of possible variations of fundamental constants using 87Rb and 133Cs 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.

Url:
DOI: 10.1088/0953-4075/38/9/002


Affiliations:


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Le document en format XML

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<term>Differential measurement</term>
<term>Differential method</term>
<term>Distant clocks</term>
<term>Doppler</term>
<term>Dual fountain</term>
<term>Eftf conf</term>
<term>Einstein equivalence principle</term>
<term>Electronic transition</term>
<term>Engineering model</term>
<term>Femtosecond laser phys</term>
<term>Flambaum</term>
<term>Fountain</term>
<term>Fountain cycles</term>
<term>Fountain ensemble</term>
<term>Fractional</term>
<term>Fractional frequency instability</term>
<term>Fractional variations</term>
<term>Frequency</term>
<term>Frequency accuracy</term>
<term>Frequency comparisons</term>
<term>Frequency instabilities</term>
<term>Frequency instability</term>
<term>Frequency measurement</term>
<term>Frequency shift</term>
<term>Frequency stability</term>
<term>Frequency standards</term>
<term>Frequency transfer system</term>
<term>Frequency transfer systems</term>
<term>Fundamental constants</term>
<term>Fundamental parameters</term>
<term>Fundamental physics tests</term>
<term>Great deal</term>
<term>Gure</term>
<term>High density</term>
<term>High precision</term>
<term>High stability</term>
<term>Hydrogen maser</term>
<term>Ieee</term>
<term>Ight model</term>
<term>Inertial sensors</term>
<term>International space station</term>
<term>Interrogation</term>
<term>Interrogation oscillator</term>
<term>Interrogation signal</term>
<term>Laboratoire kastler brossel</term>
<term>Large number</term>
<term>Laser</term>
<term>Laser source</term>
<term>Lett</term>
<term>Long observation times</term>
<term>Magnetic shields</term>
<term>Major role</term>
<term>Maser</term>
<term>Matter wave interferometry</term>
<term>Microgravity environment</term>
<term>Microwave</term>
<term>Microwave cavity</term>
<term>Microwave domain</term>
<term>Microwave power</term>
<term>Neutral atoms</term>
<term>Numerical factor</term>
<term>Optical clock</term>
<term>Optical clocks</term>
<term>Optical domain</term>
<term>Optical lattice phys</term>
<term>Optical molasses</term>
<term>Oscillator</term>
<term>Other hand</term>
<term>Overall uncertainty</term>
<term>Particular atom</term>
<term>Pharao</term>
<term>Phase gradient</term>
<term>Phase noise</term>
<term>Phys</term>
<term>Planck institute</term>
<term>Possible variations</term>
<term>Precision measurements</term>
<term>Primary frequency standards</term>
<term>Proc</term>
<term>Quality factor</term>
<term>Quantum limit</term>
<term>Quark masses</term>
<term>Ramsey interrogation</term>
<term>Recent improvements</term>
<term>Recent progress</term>
<term>Recent results ieee trans</term>
<term>Relativistic effects</term>
<term>Residual doppler effect</term>
<term>Routine operation</term>
<term>Rubidium</term>
<term>Rubidium fountains</term>
<term>Same level</term>
<term>Second part</term>
<term>Several years</term>
<term>Short term stability</term>
<term>Solid line</term>
<term>Square root</term>
<term>Strong interaction</term>
<term>Systematic effects</term>
<term>Systematic frequency shifts</term>
<term>Temporal variation</term>
<term>Temps atomique</term>
<term>Term stability</term>
<term>Time variation</term>
<term>Transition probability</term>
<term>Transportable fountain</term>
<term>Uctuations</term>
<term>Wave component</term>
<term>Western australia</term>
</keywords>
</textClass>
<langUsage>
<language ident="en">en</language>
</langUsage>
</profileDesc>
</teiHeader>
<front>
<div type="abstract">This paper describes advances in microwave frequency standards using laser-cooled atoms at BNM-SYRTE. First, recent improvements of the 133Cs and 87Rb 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 1014 1/2 where 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 1016 at 50000 s for the first time for primary standards. In addition, these clocks realize the SI second with an accuracy of 7 1016, one order of magnitude below that of uncooled devices. In a second part, we describe tests of possible variations of fundamental constants using 87Rb and 133Cs 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.</div>
</front>
</TEI>
<affiliations>
<list>
<country>
<li>Australie</li>
<li>France</li>
</country>
<region>
<li>Australie-Occidentale</li>
<li>Île-de-France</li>
</region>
<settlement>
<li>Paris</li>
</settlement>
</list>
<tree>
<country name="France">
<region name="Île-de-France">
<name sortKey="Bize, S" sort="Bize, S" uniqKey="Bize S" first="S" last="Bize">S. Bize</name>
</region>
<name sortKey="Abgrall, M" sort="Abgrall, M" uniqKey="Abgrall M" first="M" last="Abgrall">M. Abgrall</name>
<name sortKey="Cacciapuoti, L" sort="Cacciapuoti, L" uniqKey="Cacciapuoti L" first="L" last="Cacciapuoti">L. Cacciapuoti</name>
<name sortKey="Clairon, A" sort="Clairon, A" uniqKey="Clairon A" first="A" last="Clairon">A. Clairon</name>
<name sortKey="Grnert, J" sort="Grnert, J" uniqKey="Grnert J" first="J" last="Grnert">J. Grnert</name>
<name sortKey="Laurent, P" sort="Laurent, P" uniqKey="Laurent P" first="P" last="Laurent">P. Laurent</name>
<name sortKey="Lemonde, P" sort="Lemonde, P" uniqKey="Lemonde P" first="P" last="Lemonde">P. Lemonde</name>
<name sortKey="Maksimovic, I" sort="Maksimovic, I" uniqKey="Maksimovic I" first="I" last="Maksimovic">I. Maksimovic</name>
<name sortKey="Marion, H" sort="Marion, H" uniqKey="Marion H" first="H" last="Marion">H. Marion</name>
<name sortKey="Rosenbusch, P" sort="Rosenbusch, P" uniqKey="Rosenbusch P" first="P" last="Rosenbusch">P. Rosenbusch</name>
<name sortKey="Salomon, C" sort="Salomon, C" uniqKey="Salomon C" first="C" last="Salomon">C. Salomon</name>
<name sortKey="Santarelli, G" sort="Santarelli, G" uniqKey="Santarelli G" first="G" last="Santarelli">G. Santarelli</name>
<name sortKey="Santos, F Pereira Dos" sort="Santos, F Pereira Dos" uniqKey="Santos F" first="F Pereira Dos" last="Santos">F Pereira Dos Santos</name>
<name sortKey="Vian, C" sort="Vian, C" uniqKey="Vian C" first="C" last="Vian">C. Vian</name>
<name sortKey="Wolf, P" sort="Wolf, P" uniqKey="Wolf P" first="P" last="Wolf">P. Wolf</name>
</country>
<country name="Australie">
<region name="Australie-Occidentale">
<name sortKey="Luiten, A" sort="Luiten, A" uniqKey="Luiten A" first="A" last="Luiten">A. Luiten</name>
</region>
<name sortKey="Tobar, M" sort="Tobar, M" uniqKey="Tobar M" first="M" last="Tobar">M. Tobar</name>
</country>
</tree>
</affiliations>
</record>

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