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Theses

Strontium Optical Lattice Clock: In Quest of the Ultimate Performance

Abstract : This thesis presents the latest achievements regarding the Sr optical lattice clock experiment at LNE-SYRTE, Observatoire de Paris. After having described the general principles for optical lattice clocks and the operation of the clock in question, the emphasis is put on the features that have been added to the experiment since 2007. The most important new elements are an ultra-stable reference cavity for the clock laser, the development of a non-destructive detection technique, and the construction of a second Sr lattice clock. The ultra-stable cavity is constructed from a ULE spacer and fused silica mirrors and has shown a thermal noise floor at 6.5E-16, placing it among the best in the world. The non-destructive detection is effectuated by a phase measurement of a weak probe beam that traverses the atoms placed in one arm of a Mach-Zender interferometer. The non-destructive aspect enables a recycling of the atoms from cycle to cycle which consequently increases the duty cycle, allowing for an increase of the stability of the clock. With these new tools the frequency stability is expected to be 2.2E-16/tau^(1/2) for an optimized sequence. The most recent comparisons between the two Sr clocks reach an accuracy level of 1E-16 after about 1000 s, and this way we have been able to characterize lattice related frequency shifts with an unprecedented accuracy. The measurements ensure a control of lattice related effects at the 1E-18 level even for trap depths as large as 50 Er.
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Contributor : Philip Westergaard <>
Submitted on : Thursday, January 27, 2011 - 10:53:59 AM
Last modification on : Wednesday, September 23, 2020 - 4:39:01 AM
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  • HAL Id : pastel-00560080, version 1

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Philip Westergaard. Strontium Optical Lattice Clock: In Quest of the Ultimate Performance. Atomic Physics [physics.atom-ph]. Télécom ParisTech, 2010. English. ⟨pastel-00560080⟩

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