Steven Peil
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View article: Progress on Optical Clock Technology for Operational Timescales
Progress on Optical Clock Technology for Operational Timescales Open
While optical clock technology has advanced rapidly in recent years, incorporating the technology into operational timescales has progressed more slowly. The highest accuracy frequency standards for groundbreaking measurements do not easil…
View article: Clock synchronization characterization of the Washington DC metropolitan quantum network (DC-QNet)
Clock synchronization characterization of the Washington DC metropolitan quantum network (DC-QNet) Open
Quantum networking protocols relying on interference and precise time-of-flight measurements require high-precision clock synchronization. This study describes the design, implementation, and characterization of two optical time transfer m…
View article: Deployment of a Transportable Yb Optical Lattice Clock
Deployment of a Transportable Yb Optical Lattice Clock Open
We report on the first deployment of a ytterbium (Yb) transportable optical lattice clock (TOLC), commercially shipping the clock 3,000 km from Boulder, Colorado to Washington DC. The system, composed of a rigidly mounted optical reference…
View article: Cold Beam Optical Clock with Multifrequency Spectroscopy
Cold Beam Optical Clock with Multifrequency Spectroscopy Open
We demonstrate an optical clock based on Ramsey-Bordé interferometry in a laser-cooled ${}^{40}$Ca beam. The mean velocity is reduced by an order of magnitude relative to a thermal beam and the transverse temperature approaches the Doppler…
View article: Tellurium spectrometer for 1S–1P1 transitions in strontium and other alkaline-earth atoms
Tellurium spectrometer for 1S–1P1 transitions in strontium and other alkaline-earth atoms Open
We measure the spectrum of tellurium-130 in the vicinity of the 461 nm S01−P11 cycling transition in neutral strontium, a popular element for atomic clocks, quantum information, and quantum-degenerate gases. The lack of hyperfine structure…
View article: Competition between factors determining bright versus dark atomic states within a laser mode
Competition between factors determining bright versus dark atomic states within a laser mode Open
We observe bimodal fluorescence patterns from atoms in a fast atomic beam when the laser excitation occurs in the presence of a magnetic field and the atoms sample only a portion of the laser profile. The behavior is well explained by comp…
View article: Vapor-cell frequency reference for short-wavelength transitions in neutral calcium
Vapor-cell frequency reference for short-wavelength transitions in neutral calcium Open
We have characterized the molecular tellurium (Te$_2$) spectrum in the vicinity of the 423nm $^1S_0-^1P_1$ and the 431nm $^3P_1-^3P_0$ transitions in neutral calcium. These transitions are relevant to optical clocks for atomic-beam charact…
View article: Microwave-clock timescale with instability on order of 10<sup>−17</sup>
Microwave-clock timescale with instability on order of 10<sup>−17</sup> Open
The fundamental limits of atomic fountains as operational clocks are considered. Four rubidium fountains in operation at the U.S. Naval Observatory for over 5.5 years have demonstrated unprecedented long-term stability for continuously run…