A5001847256- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Subatomic Physics Research
- Advanced Frequency and Time Standards
- Quantum, superfluid, helium dynamics
- Quantum optics and atomic interactions
- Spectroscopy and Laser Applications
- Optical properties and cooling technologies in crystalline materials
- Quantum Information and Cryptography
- Advanced Fiber Laser Technologies
- Advanced Chemical Physics Studies
- Strong Light-Matter Interactions
- Dust and Plasma Wave Phenomena
- Semiconductor Lasers and Optical Devices
- Particle accelerators and beam dynamics
- Scientific Measurement and Uncertainty Evaluation
- Analytical Chemistry and Sensors
- Optical Wireless Communication Technologies
- Gas Sensing Nanomaterials and Sensors
- Network Time Synchronization Technologies
- Spectroscopy and Quantum Chemical Studies
- Experimental and Theoretical Physics Studies
- Boron and Carbon Nanomaterials Research
- Laser-induced spectroscopy and plasma
- Advanced Sensor Technologies Research
- Topological Materials and Phenomena
Utah State University Space Dynamics Laboratory
2017-2024
Energy Dynamics (Norway)
2024
United States Air Force Research Laboratory
2020-2022
Kirtland Air Force Base
2018-2022
Utah State University
2022
Applied Technology Associates (United States)
2020
National Institute of Standards and Technology
2006-2015
Joint Quantum Institute
2015
University of Colorado Boulder
2006-2013
Cornell University
2006
We demonstrate one- and two-dimensional transverse laser cooling magneto-optical trapping of the polar molecule yttrium (II) oxide (YO). In a 1D trap (MOT), we characterize force decrease temperature by an order magnitude, from 25 to 2 mK, limited interaction time. 2D MOT, enhance intensity YO beam reduce in both directions. The approach demonstrated here can be applied many molecular species also extended 3D.
We engineered a two-dimensional magnetic lattice in an elongated strip geometry, with effective per-plaquette flux ~4/3 times the quanta. imaged localized edge and bulk states of atomic Bose-Einstein condensates this strip, single lattice-site resolution along narrow direction. Further, we observed both skipping orbits excited atoms traveling down our system's edges, analogues to magnetoplasmons 2-D electron systems, dynamical Hall effect for excitations. Our lattice's long direction...
We propose a method for laser cooling and trapping substantial class of polar molecules and, in particular, titanium (II) oxide (TiO). This uses pulsed electric fields to nonadiabatically remix the ground-state magnetic sublevels molecule, allowing one build magneto-optical trap based on quasicycling ${J}^{\ensuremath{'}}={J}^{\ensuremath{'}\ensuremath{'}}\ensuremath{-}1$ transition. Monte Carlo simulations this electrostatically remixed demonstrate feasibility TiO temperature $10\text{...
We report magnetic confinement of neutral, ground state OH at a density approximately 3 x 10(3) cm(-3) and temperature 30 mK. An adjustable electric field sufficiently large to polarize the is superimposed on trap in various geometries, making an overall potential arising from both Zeeman Stark effects. effective molecular Hamiltonian constructed, with Monte Carlo simulations accurately modeling observed single-molecule dynamics configurations. Magnetic trapping cold polar molecules under...
Optical frequency standards surpass their microwave counterparts in both stability and accuracy, yet they are often bulky, power-hungry, unable to operate outside of a well-controlled laboratory environment. Leveraging two-photon transition ${}^{87}$Rb vapor recent advances fiber combs, the authors build an optical clock beat current portable standards, with architecture that can be made compact low-power. These results point way real-world standard even higher stability, for applications...
Cold, neutral hydroxyl radicals are Stark decelerated and efficiently loaded into a permanent magnetic trap. The OH molecules trapped in the rovibrational ground state at density of approximately 10;{6} cm;{-3} temperature 70 mK. Collision studies between sample supersonic beams atomic He molecular D2 determine absolute collision cross sections. He-OH D2-OH center-of-mass energies tuned from 60 cm;{-1} to 230 145 510 cm;{-1}, respectively, yielding evidence quantum threshold scattering...
Cold molecules promise to reveal a rich set of novel collision dynamics in the low-energy regime. By combining for first time techniques Stark deceleration, magnetic trapping, and cryogenic buffer gas cooling, we present experimental observation cold collisions between two different species state-selected neutral polar molecules. This has enabled an absolute measurement total trap loss cross sections OH ND(3) at mean energy 3.6 cm(-1) (5 K). Due dipolar interaction, section increases upon...
Microgravity eases several constraints limiting experiments with ultracold and condensed atoms on ground. It enables extended times of flight without suspension eliminates the gravitational sag for trapped atoms. These advantages motivated numerous initiatives to adapt operate experimental setups microgravity platforms. We describe design payload, motivations choices, capabilities Bose-Einstein Condensate Cold Atom Laboratory (BECCAL), a NASA-DLR collaboration. BECCAL builds heritage...
Abstract Multi-node optical clock networks will enable future studies of fundamental physics and applications in quantum classical communications as well navigation geodesy. We implement the first ever multi-node network with real-time, relative synchronization over free-space communication channels precision on order 10 femtoseconds, realized a three-node system hub-and-spoke topology. In this paper we describe its performance, including measurement time between nodes no direct link or...
We demonstrate a two-dimensional (2D) grating magneto-optical trap (GMOT) with single input cooling laser beam and planar diffraction using $^{87}\mathrm{Rb}$. This configuration increases experimental access when compared traditional 2D (MOT). As described in the paper, output flux is several hundred million rubidium atoms/s at mean velocity of 16.5(9) m/s distribution 4(3) standard deviation. use atomic from GMOT to loading three-dimensional (3D)...
Optical clocks are emerging as next-generation timekeeping devices with technological and scientific use cases. Simplified atomic sources such vapor cells may offer a straightforward path to field use, but suffer from long-term frequency drifts environmental sensitivities. Here, we measure laboratory optical clock based on warm rubidium atoms find low levels of drift the month-long timescale. We observe quantify helium contamination inside glass cell by gradually removing via vacuum...
The $5S_{1/2}\rightarrow 5D_{5/2}$ two-photon transition in Rb is of interest for the development a compact optical atomic clock. Here we present rigorous calculation 778.1~nm ac-Stark shift ($2.30(4) \times10^{-13}$(mW/mm$^2$)$^{-1}$) that good agreement with our measured value $2.5(2) \times10^{-13}$(mW/mm$^2$)$^{-1}$. We include temperature-dependent blackbody radiation shift, predict clock could be operated either zero net BBR ($T=495.9(27)$~K) or first-order sensitivity...
Cold and ultracold polar molecules with nonzero electronic angular momenta are of great interest for studies in quantum chemistry control, investigations novel systems, precision measurement. However, mixed electric magnetic fields, these generically subject to a large set avoided crossings among their Zeeman sublevels; traps, lead distorted potentials trap loss from bias fields. We have characterized OH by microwave-transferring trapped the upper...
Free-space optical time and frequency transfer techniques can synchronize fixed ground stations at the femtosecond level, over distances of tens kilometers. However, will be required to span intercontinental in order truly unlock performance standards support an eventual redefinition SI second. Fiber dispersion Sagnac uncertainty severely limit long-range fiber networks, so satellite-based free-space is a promising solution. In pursuit ground-to-space transfer, previous work has considered...
The superconducting cavities in an Energy-Recovery-Linac will be operated with a high loaded Q of several 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">7</sup> , possible up to xmlns:xlink="http://www.w3.org/1999/xlink">8</sup> . Not only has no prior control system ever stabilized the RF field elliptical linac cavity such Q, but also highest stability amplitude and phase is required at this Q. Because resulting bandwidth few Hz, presents...
Ultracold atoms and molecules provide ideal stages for precision tests of fundamental physics. With microkelvin neutral strontium confined in an optical lattice, we have achieved a fractional resolution 4 × 10 -15 on the 1 S 0 – 3 P doubly forbidden 87 Sr clock transition at 698 nm. Measurements line shifts as function experimental parameters indicate systematic errors below level. The ultrahigh spectral permits resolving nuclear spin states small magnetic fields, leading to measurements...
Inelastic collisions are observed between magnetically trapped neutral hydroxyl (OH•) radicals at a temperature of 45 mK in the presence an electric field. The collision rate is measured over range fields from 0.2 to 10 kV/cm. However, two-body rates must be deconvolved novel electric-field induced non-adiabatic single particle loss, which arises Landau–Zener crossings energy surfaces plane where field vector transverse trapping magnetic inelastic follows approximate quadratic power law...
We directly measured the normalized s-wave scattering cross-section of ultracold 40K atoms across a magnetic-field Feshbach resonance by colliding pairs degenerate Fermi gases (DFGs) and imaging scattered atoms. extracted fraction for range bias magnetic fields, location to be B0 = 20.206(15) mT with width Δ 1.0(5) mT. To optimize signal-to-noise ratio atom number in images, we developed techniques interpret absorption images regime where recoil induced detuning corrections are significant....
We report the fabrication, characterization, and use of rubidium vapor dispensers based on highly-oriented pyrolytic graphite (HOPG) intercalated with metallic rubidium. Compared to commercial chromate salt dispensers, these HOPG (IHOPG) hold an order magnitude more in a similar volume, require less than one-fourth heating power, emit one-half as many impurities. Appropriate processing permits exposure IHOPG atmosphere for over ninety minutes without any adverse effects. Intercalation cesium...