732 citations · 915 across the 14 of their papers we have counts for
15 papers
Two-photon Doppler-free spectroscopy of the Rydberg transition for quantum sensing in ytterbium
Benjamin D. Hunt, Kyle Beloy, Roger C. Brown +5
Here we report atomic structure calculations and experimental observations of the two-photon transition in Yb. The unique level structure of…
Atomic clock frequency ratios with fractional uncertainty
Alexander Aeppli, Willa J. Arthur-Dworschack, Kyle Beloy +24
We report high-precision frequency ratio measurements between optical atomic clocks based on Al, Yb, and Sr. With total fractional uncertainties at or bel…
Cryogenic Optical Lattice Clock with Blackbody Radiation Stark Uncertainty
Youssef S. Hassan, Kyle Beloy, Jacob L. Siegel +9
Controlling the Stark perturbation from ambient thermal radiation is key to advancing the performance of many atomic frequency standards, including state-of-the-art optical lattice…
Radio Frequency from Optical with Instabilities below - Generation and Measurement
A. Hati, M. Pomponio, N. V. Nardelli +7
This paper presents a frequency synthesis that achieves exceptional stability by transferring optical signals to the radio frequency (RF) domain at 100 MHz. We describe and charact…
Deployment of a Transportable Yb Optical Lattice Clock
Tobias Bothwell, Wesley Brand, Robert Fasano +16
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.…
Lattice Light Shift Evaluations In a Dual-Ensemble Yb Optical Lattice Clock
Tobias Bothwell, Benjamin D. Hunt, Jacob L. Siegel +9
In state-of-the-art optical lattice clocks, beyond-electric-dipole polarizability terms lead to a break-down of magic wavelength trapping. In this Letter, we report a novel approac…
Clock-line-mediated Sisyphus Cooling
Chun-Chia Chen, Jacob L. Siegel, Benjamin D. Hunt +6
We demonstrate sub-recoil Sisyphus cooling using the long-lived clock state in alkaline-earth-like ytterbium. A 1388 nm optical standing wave nearly resonant w…
Ratchet Loading and Multi-Ensemble Operation in an Optical Lattice Clock
Youssef S. Hassan, Takumi Kobayashi, Tobias Bothwell +6
We demonstrate programmable control over the spatial distribution of ultra-cold atoms confined in an optical lattice. The control is facilitated through a combination of spatial ma…
Excited-Band Coherent Delocalization for Improved Optical Lattice Clock Performance
Jacob Siegel, William McGrew, Youssef Hassan +5
We implement coherent delocalization as a tool for improving the two primary metrics of atomic clock performance: systematic uncertainty and instability. By decreasing atomic densi…
Sub-recoil clock-transition laser cooling enabling shallow optical lattice clocks
X. Zhang, K. Beloy, Y. S. Hassan +5
Laser cooling is a key ingredient for quantum control of atomic systems in a variety of settings. In divalent atoms, two-stage Doppler cooling is typically used to bring atoms to t…
Characterization and suppression of background light shifts in an optical lattice clock
R. J. Fasano, Y. J. Chen, W. F. McGrew +3
Experiments involving optical traps often require careful control of the ac Stark shifts induced by strong confining light fields. By carefully balancing light shifts between two a…
Atomic clock performance beyond the geodetic limit
W. F. McGrew, X. Zhang, R. J. Fasano +9
The passage of time is tracked by counting oscillations of a frequency reference, such as Earth's revolutions or swings of a pendulum. By referencing atomic transitions, frequency…
Sub-femtosecond absolute timing precision with a 10 GHz hybrid photonic-microwave oscillator
T. M. Fortier, C. W. Nelson, A. Hati +10
We present an optical-electronic approach to generating microwave signals with high spectral purity. By circumventing shot noise and operating near fundamental thermal limits, we d…
Cold collision shift cancelation and inelastic scattering in a Yb optical lattice clock
A. D. Ludlow, N. D. Lemke, J. A. Sherman +4
Recently, p-wave cold collisions were shown to dominate the density-dependent shift of the clock transition frequency in a 171Yb optical lattice clock. Here we demonstrate that by…
Two-photon absorption in potassium niobate
A. D. Ludlow, H. M. Nelson, S. D. Bergeson
We report measurements of thermal self-locking of a Fabry-Perot cavity containing a potassium niobate (KNbO3) crystal. We develop a method to determine linear and nonlinear optical…