A5081548221- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Frequency and Time Standards
- Atomic and Subatomic Physics Research
- Quantum, superfluid, helium dynamics
- Photonic and Optical Devices
- Non-Invasive Vital Sign Monitoring
- Semiconductor Lasers and Optical Devices
- Strong Light-Matter Interactions
- Spectroscopy and Laser Applications
- Advanced Thermodynamics and Statistical Mechanics
- Fluid Dynamics and Turbulent Flows
- Acoustic Wave Resonator Technologies
- Mechanical and Optical Resonators
- Inertial Sensor and Navigation
- Advanced Thermodynamic Systems and Engines
- Quantum Information and Cryptography
- Phase-change materials and chalcogenides
- Spectroscopy and Quantum Chemical Studies
- Photorefractive and Nonlinear Optics
- GNSS positioning and interference
- Thin-Film Transistor Technologies
- Quantum optics and atomic interactions
- Nonlinear Optical Materials Studies
- Physics of Superconductivity and Magnetism
- Organic Electronics and Photovoltaics
Mitre (United States)
2020-2021
Microsemi (United States)
2015
Physical Sciences (United States)
2009-2012
University of Arizona
2007-2008
We report observations of vortex formation by merging and interfering multiple $^{87}\mathrm{Rb}$ Bose-Einstein condensates (BECs) in a confining potential. In this experiment, single harmonic potential well is partitioned into three sections barrier, enabling the simultaneous independent, uncorrelated BECs. The BECs may either automatically merge together during their growth, or for high-energy barriers, can be merged barrier removal after formation. Either process instigate resulting BEC,...
Rydberg atom electric field sensors are projected to enable novel capabilities for resilient communications and sensing. This quantum sensor is small-size, highly sensitive, broadly tunable, it has the potential performing precision vector angle-of-arrival measurements. While these atomic will not replace traditional receivers in commodity applications RF signal reception, could be an enabling technology niche application spaces. review outlines principles of operation compares their...
Recently, there has been significant interest in providing positioning, navigation, and timing (PNT) capability from low-Earth orbit (LEO) satellites. Providing PNT independently of medium-Earth (MEO) global navigation satellite systems (GNSS) offers the potential to complement or back up these systems. LEO satellites offer several advantages over MEO satellites, including lower required transmit power potentially cost-to-orbit. In parallel, recent progress development high-performance,...
The radial acceleration relation (RAR) follows from Milgromian gravitation (MoND) and velocity dispersion data of many dwarf spheroidal galaxies (dSphs) galaxy clusters have been reported to be in tension with it. We consider the generalized Poisson equation (GPE), expressed terms p-Laplacian, which has applied electrodynamics, investigate whether it can address these tensions. From GPE we derive a RAR characterized by p parameter p-Laplacian formula for Plummer model. apply models Milky Way...
A glass ultrahigh vacuum chamber with rubidium alkali metal dispensers and nonevaporable getter pumps has been developed used to create a cold atomic sample in that operates only passive pumps. The ion-mass spectrum of evaporated gases from the dispenser recorded as function current. efficacy promoting maintaining characterized by observation Rb vapor optical absorption on D2 transition at 780 nm pressure rate rise tests. authors have demonstrated laser-cooled atoms this when isolated...
We describe the development and frequency instability measurements of a highly miniaturized, buffer gas cooled, trapped-ion atomic clock. The clock utilizes 12.6 GHz hyperfine transition <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">171</sup> Yb xmlns:xlink="http://www.w3.org/1999/xlink">+</sup> ion. A custom-built 3 cm xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> vacuum package containing ion trap is integrated with other key elements...
Atomic clocks play a crucial role in timekeeping, communications, and navigation systems. Recent efforts enabled by heterogeneous MEMS integration have led to the commercial introduction of Chip-Scale Clocks (CSAC) with volume 16 cm3, power consumption 120 mW, instability (Allan Deviation) {\sigma}({\tau} = 1 sec) < 2e-10. In order reduce temperature sensitivity next-generation CSACs for timing applications, interaction atoms environment must be minimized, which can accomplished an...
An apparatus for producing atomic-gas Bose-Einstein condensates (BECs) of 87-Rb atoms is described. The produces BECs in a dual-chamber vacuum system that incorporates magnetic transport trapped from the magneto-optical trapping cell to BEC production via operation series overlapping magnet coils. design, construction, and are described detail. used study creation quantized vortices by merging interference multiple condensates. In this experiment, single harmonic potential well partitioned...
We demonstrate an improvement in short-term stability by a factor of 10 over previous generation miniature buffer gas cooled trapped ion clock. describe the enhancement to detection SNR that has enabled this improvement, method clock operation, and measurement stability. Additionally, we numerically investigate magnitude Dick effect our pulsed
We present numerical results indicating 18% enhancement in the percentage of light absorbed organic photovoltaic cells with embedded metallic nano-gratings. show initial nanofabrication nano-gratings ~200 nm period.
We are developing prototype chip-scale low-power integrated-optic gas-phase chemical sensors based on infrared Tunable Diode Laser Absorption Spectroscopy (TDLAS). TDLAS is able to sense many gas phase chemicals with high sensitivity and selectivity. Using semiconductor fabrication assembly techniques, the low-cost integrated optic technology will permit mass production of that have wide ranging industrial, medical, environmental, consumer applications. Novel sensing elements using low-loss...
Over the past several decades, laboratory atomic clocks have been improving far faster than their industrial counterparts. We discuss expected improvements in clock products near future.
Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text D. R. Scherer, J. M. Hensley, K. Parameswaran, B. F. Casse, V. Singh, P. T. Lin, A. Agarwal, L. C. Kimerling, Giammarco, Wilkinson, I. Luzinov, Musgraves, Richardson, Hu, S. Kim, W. Bewley, Canedy, Vurgaftman, Abell, Meyer, and "Characterization of Mid-Infrared Interband Cascade Laser Coupling a GeSbS Chalcogenide Glass Waveguide," in Conference Lasers Electro-Optics...
Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text D. R. Scherer, J. Montoya, M. Hensley, and G. Allen, "Tunable External-Cavity Quantum Cascade Laser Sources for Gas Sensing Spectroscopy," in Conference Lasers Electro-Optics/International Electronics Conference, OSA Technical Digest (CD) (Optica Publishing Group, 2009), paper JTuD18. Export BibTex Endnote (RIS) HTML Plain alert Save article
Qubits based on trapped ions are being investigated as a promising platform for scalable quantum information processing. One challenge associated with the scalability of such multi-qubit ion system is need an ultraviolet (UV) laser beam switching and control to independently modulate address large qubit arrays. In this work, we propose experimentally demonstrate novel architecture computing fast electro-optic amplitude high-fidelity electromechanical shuttering using microelectromechanical...
We report on experiments and simulations of the growth a Bose-Einstein condensate in which vortices are observed to form spontaneously non-rotating potential. Between 10% 50% result between one three unambiguous vortex cores. simulate temperature quench Bose gas through critical point using stochastic Gross-Pitaevskii equation find remarkable agreement with experimental data. Faster cooling results higher probability formation, we interpret these light Kibble-Zurek scenario for formation...