A5054341575- Advanced Frequency and Time Standards
- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Subatomic Physics Research
- Quantum optics and atomic interactions
- Quantum Information and Cryptography
- Cardiovascular Syncope and Autonomic Disorders
- Scientific Measurement and Uncertainty Evaluation
- Advanced Electrical Measurement Techniques
- Advanced Fiber Laser Technologies
- Radioactive Decay and Measurement Techniques
- Photonic and Optical Devices
- Semiconductor Lasers and Optical Devices
- Network Time Synchronization Technologies
- Optical measurement and interference techniques
- Legal and Policy Issues
- Magnetic properties of thin films
- Advanced Chemical Physics Studies
- Magneto-Optical Properties and Applications
- Nonlinear Dynamics and Pattern Formation
- Nasal Surgery and Airway Studies
- Spectroscopy and Laser Applications
- Healthcare Technology and Patient Monitoring
- Advanced Fiber Optic Sensors
- Physics and Engineering Research Articles
- Vietnamese History and Culture Studies
National Physical Laboratory
2011-2023
Teddington Memorial Hospital
2012
University of Stuttgart
2001-2003
The design, operating parameters and the accuracy evaluation of NPL Rb atomic fountain are described. employs a double magneto-optical arrangement that allows large number 87Rb atoms to be trapped, water-cooled temperature-stabilized interrogation region high quality factor cavity. From uncertainties measured calculated systematic frequency shifts, fractional is estimated 3.7 × 10−16. stability, limited predominantly by noise in local oscillator, 7 10−16 after one day averaging. Based on...
The use of ultra-precise optical clocks in space ("master clocks") will allow for a range new applications the fields fundamental physics (tests Einstein's theory General Relativity, time and frequency metrology by means comparison distant terrestrial clocks), geophysics (mapping gravitational potential Earth), astronomy (providing local oscillators radio ranging interferometry space). Within ELIPS-3 program ESA, "Space Optical Clocks" (SOC) project aims to install operate an lattice clock...
We present the design, construction, and characterization of longitudinal- transverse-field Zeeman slowers, based on arrays permanent magnets, for slowing thermal beams atomic Sr. The slowers are optimized operation with deceleration related to local laser intensity (by parameter ), which uses more effectively available power, in contrast usual constant mode. Slowing efficiencies up ≈18% realized compared those predicted by modelling. highlight slower, is compact, highly tunable,...
Integrated photonic circuits based on suspended rib waveguides, which can be used for coherent trapping, guiding, and splitting of ultra-cold neutral atoms in two-colour evanescent light fields near their surfaces, are described. Configurations quantum inertial sensors such integrated atomo-photonic simultaneously guiding photons along the same paths, presented. The difference between free-space guided atom interferometers presence external forces is explained. theoretical technological...
The ESA mission "Space Optical Clock" project aims at operating an optical lattice clock on the ISS in approximately 2023. scientific goals of are to perform tests fundamental physics, enable space-assisted relativistic geodesy and intercompare clocks ground using microwave links. performance goal space is less than $1 \times 10^{-17}$ uncertainty 10^{-15} {\tau}^{-1/2}$ instability. Within EU-FP7-funded project, a strontium demonstrator has been developed. Goal performances instability...
Coherent guiding of atoms in two-colour evanescent light fields two main single modes suspended optical rib waveguides is investigated theoretically. Special attention paid to widths larger than the wavelength light, which provide better lateral stability surface traps and waveguides, can be used coherent Bragg beam splitters for matter waves, based on gratings formed by interference waves crossed waveguides. A single-mode regime evanescent-wave investigated. The general structure key...
The use of ultra-precise optical clocks in space ("master clocks") will allow for a range new applications the fields fundamental physics (tests Einstein's theory General Relativity, time and frequency metrology by means comparison distant terrestrial clocks), geophysics (mapping gravitational potential Earth), astronomy (providing local oscillators radio ranging interferometry space). Within ELIPS-3 program ESA, "Space Optical Clocks" (SOC) project aims to install operate an lattice clock...
The results of precision measurements the 87Rb ground-state hyperfine transition frequency, which were conducted at NPL from 2009 to 2013, are reported. resulting measured using NPL's Cs and Rb atomic frequency standards, demonstrates reasonable agreement with most recent reported by LNE-SYRTE.
Abstract We perform an experimental and theoretical study of a novel distributed quasi-Bragg splitter for cold atoms propagating in crossed optical waveguides. The are guided by horizontal red-detuned laser beams which cross with angle roughly 90°. lattice formed the interference between two waveguides is used as to continuously deflect atomic flux from one waveguide into other. In limit strong confinement depending on velocity cloud, three main regimes observed corresponding (1) absence...
The evolution of the transverse momentum monochromatic light entering a multimode planar waveguide at large angle is investigated. We report on oscillations caused by beatings between adjacent populated modes and their periodic collapses revivals. A new type an interferometer based this effect with fringe spacing as small lambda/9 demonstrated experimentally, periods lambda/1000 seem to be feasible.
We report the successful demonstration and characterisation of a Zeeman slower based on an array permanent magnets, implemented for atomic Sr <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sup> S <sub xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> → P xmlns:xlink="http://www.w3.org/1999/xlink">1</sub> transition at 461 nm. Measurements longitudinal velocity distributions MOT loading characteristics are presented. In particular, we...
Optical dipole traps and fractional Talbot optical lattices based on the interference between multiple copropagating laser beams are proposed. The variation of relative amplitudes phases interfering light these makes it possible to manipulate spatial position trapped atoms. Examples translation splitting atoms a set considered. prospect constructing all-light atom chips proposed technique is presented.
In this paper it is proposed to use a periodic array of very strong and compact neodymium magnets create the desired magnetic field Zeeman slower. A model slower based on point-like dipoles has been introduced, which key element in designing such type The high precision that simple confirmed with exact numerical calculations for finite-size magnets. two basic configurations dipole slower, longitudinal transverse direction dipoles, have investigated.
Objective 1) To study laser septochondrocorrection (LSC) technology. 2) characterize the medical equipment. 3) present clinical data. The LSC uses thermo‐mechanical effect of non‐destructive radiation for a bloodless and painless correction septonasal deformities. Methods equipment non‐invasive reshaping cartilage includes fiber 1.56‐micrometer laser, special instrument feedback control system. was performed on 1000 patients whose ages ranged between 12 68 years age, including 934 in Russia...
The first characterization of the distributed cavity phase frequency shift NPL Rb fountain standard is reported. It shown how symmetric part can be used to set up vertical angle fountain. estimated uncertainty 1.25×10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-16</sup> reduces total type B down 2.4×10 .