Limits to time variation of fundamental constants from comparisons of atomic frequency standards

Lea, S. N.

doi:10.1088/0034-4885/70/9/r01

Cited by 80 publications

(77 citation statements)

References 163 publications

(282 reference statements)

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“…While a more mundane answer might center around the advances in creating UV sources of light and the accuracy of performing spectroscopy with these sources, a host of other more exotic uses for these clocks might exist. In fact, comparing optical clocks made with the same species has already been used to provide more stringent restrictions on the coupling of fundamental constants to weak gravitational forces [38], and in the future measuring frequency ratios of highly accurate optical clocks will put stringent limitations on the drift of the fine structure constant with time [38,39]. As stable long term oscillators, optical lattice clocks offer a path forward for sub-mm wave very long baseline interferometry (VLBI) [40].…”

Section: New Results From a Cryogenic Cs Fountain Clock At The Nationmentioning

confidence: 99%

Building a better atomic clock

Bloom¹

2013

Phys. Today

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DateThe final copy of this thesis has been examined by the signatories, and we find that both the content and the form meet acceptable presentation standards of scholarly work in the above mentioned discipline. this work documents the first optical lattice clock to best all other atomic clock implementations, a mere 8 years after the first proof of principle experiments. In this thesis I will describe how we have overcome a number of important systematic uncertainties to achieve these results. This revolution in accuracy and precision opens the door for new experiments utilizing the clock as a probe of quantum many-body physics. To this end, a new apparatus has been designed that combines the unprecedented precision of clock experiments with the amazing progress attained in quantum gas experiments. DedicationTo my family, both old and new.

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Section: New Results From a Cryogenic Cs Fountain Clock At The Nationmentioning

confidence: 99%

Building a better atomic clock

Bloom¹

2013

Phys. Today

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“…Research with ultracold (< 1 mK) atoms has greatly expanded our knowledge of quantum many-body physics [1], precision metrology [2], possible time and space variation of fundamental constants [3], and quantum information science [4]. Ultracold molecules are desirable as a powerful extension of these efforts, but also as a promising starting point for entirely new investigations.…”

Section: Introductionmentioning

confidence: 99%

Continuous all-optical deceleration and single-photon cooling of molecular beams

et al. 2014

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Ultracold molecular gases are promising as an avenue to rich many-body physics, quantum chemistry, quantum information, and precision measurements. This richness, which flows from the complex internal structure of molecules, makes the creation of ultracold molecular gases using traditional methods (laser plus evaporative cooling) a challenge, in particular due to the spontaneous decay of molecules into dark states. We propose a way to circumvent this key bottleneck using an alloptical method for decelerating molecules using stimulated absorption and emission with a single ultrafast laser. We further describe single-photon cooling of the decelerating molecules that exploits their high dark state pumping rates, turning the principal obstacle to molecular laser cooling into an advantage. Cooling and deceleration may be applied simultaneously and continuously to load molecules into a trap. We discuss implementation details including multi-level numerical simulations of strontium monohydride (SrH). These techniques are applicable to a large number of molecular species and atoms with the only requirement being an electric dipole transition that can be accessed with an ultrafast laser.

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“…Compact and tunable stable light sources are in high demand in metrology [1] and biochemical sensing [2,3] to mention just two predominant fields. Optical resonators are at the heart of narrow frequency light sources.…”

Section: Introductionmentioning

confidence: 99%

Sub-kHz lasing of a CaF_2 whispering gallery mode resonator stabilized fiber ring laser

Collodo¹,

Sedlmeir²,

Sprenger³

et al. 2014

Opt. Express

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We utilize a high quality calcium fluoride whispering-gallerymode resonator to passively stabilize a simple erbium doped fiber ring laser with an emission frequency of 196 THz (wavelength 1530 nm) to an instantaneous linewidth below 650 Hz. This corresponds to a relative stability of 3.3 × 10 −12 over 16 µs. In order to characterize the linewidth we use two identical self-built lasers and a commercial laser to determine the individual lasing linewidth via the three-cornered-hat method. We further show that the lasers are finely tunable throughout the erbium gain region.

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Limits to time variation of fundamental constants from comparisons of atomic frequency standards

Cited by 80 publications

References 163 publications

Building a better atomic clock

Building a better atomic clock

Continuous all-optical deceleration and single-photon cooling of molecular beams

Sub-kHz lasing of a CaF_2 whispering gallery mode resonator stabilized fiber ring laser

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