A5052737853- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Frequency and Time Standards
- Atomic and Subatomic Physics Research
- Microwave Engineering and Waveguides
- Antenna Design and Optimization
- Advanced Measurement and Metrology Techniques
- Antenna Design and Analysis
- Radioactive Decay and Measurement Techniques
- Advanced Antenna and Metasurface Technologies
- Laser Design and Applications
- Spectroscopy and Laser Applications
- Astronomical Observations and Instrumentation
- Scientific Measurement and Uncertainty Evaluation
- Linguistics and Discourse Analysis
- Electromagnetic Compatibility and Noise Suppression
- Language, Metaphor, and Cognition
- Plasma Applications and Diagnostics
- 3D Surveying and Cultural Heritage
- Gyrotron and Vacuum Electronics Research
- Particle Accelerators and Free-Electron Lasers
- Humor Studies and Applications
- Advanced Fiber Laser Technologies
- Adaptive optics and wavefront sensing
- Microwave and Dielectric Measurement Techniques
- Retinal Imaging and Analysis
University of Lausanne
2021-2022
Institut d’Optique Graduate School
2018-2020
ALPhANOV (France)
2018-2019
Muquans (France)
2016-2018
Centre National d'Études Spatiales
2009-2017
Laboratoire Charles Fabry
2009-2017
European Organization for Nuclear Research
2013-2014
Centre National de la Recherche Scientifique
2006-2011
Université Paris-Sud
2007-2011
Systèmes de Référence Temps-Espace
2009-2011
Inertial sensors relying on atom interferometry offer a breakthrough advance in variety of applications, such as inertial navigation, gravimetry or ground- and space-based tests fundamental physics. These instruments require quiet environment to reach their performance using them outside the laboratory remains challenge. Here we report first operation an airborne matter-wave accelerometer set up aboard 0g plane operating during standard gravity (1g) microgravity (0g) phases flight. At 1g,...
A technique is introduced which uses the conventional polynomial representation of antenna pattern produced by an equispaced linear array. Certain roots are displaced from unit circle radially, to fill a portion pattern, before this displayed lobes interspersed deep nulls. The angular and radial positions all simultaneously adjusted so that amplitude each ripple in shaped region height sidelobe nonshaped individually controlled. Applications cosec2Θ × cos Θ flat-topped beam presented....
Pertinent theory for the design of longitudinal slot arrays is reviewed and its dependence on dominant mode scattering off a single pinpointed. The critical need to know resonant length versus offset emphasized desirability determining this information theoretically rather than experimentally argued. Then method moments solutions are used calculate given waveguide dimensions frequency. These theoretical results compared new, carefully obtained experimental data. Agreement found be so good,...
Use is made of an existing technique to synthesize a sum pattern whose sidelobe peaks fit prescribed envelope in specified segment the visible region. In terms polynomial representation pattern, certain roots are then displaced radially off unit circle achieve null-filling. The result shaped beam with low, equal-percentage ripple, and heights nonshaped region that individually controlled. procedure illustrated for linear array, designed produce <tex...
We present a compact and stable dual-wavelength laser source for onboard atom interferometry with two different atomic species. It is based on frequency-doubled telecom lasers locked femtosecond optical frequency comb. take advantage of the maturity fiber technology to reduce number free-space components which are intrinsically less stable, make setup immune vibrations thermal fluctuations. The provides agility phase stability required can easily be adapted other cold experiments. have shown...
Abstract We describe the realization and characterization of a compact, autonomous fiber laser system that produces optical frequencies required for cooling, trapping, manipulation, detection 87 Rb atoms - typical atomic species emerging quantum technologies. This device, customized from Muquans company, is designed use in challenging operating environment Laboratoire Souterrain à Bas Bruit (LSBB) France, where new large scale atom interferometer being constructed underground MIGA antenna....
A pattern synthesis procedure is developed for a planar aperture with circular boundary. (Ø-symmetric continuous distribution assumed and required to produce flat-topped beam controlled ripple, surrounded by ring side lobes of height. With M filled-in nulls in the shaped region, there are 2M solutions distribution. Sampling can yield excitation grid array. Linear stretching extends results an elliptical
An extension of Taylor's circular aperture pattern synthesis technique permits the generation a flat-topped beam that is rotationally symmetric, surrounded by ring side lobes controllable height, with ripple amplitude also controllable. The corresponding continuous distribution can be made pure real appropriate root-pairing, which makes results applicable, via sampling, to resonantly-spaced waveguide slot arrays. A one-dimensional linear stretch extends rectangular grid planar arrays...
We suggest different simple schemes to efficiently load and evaporate a ''dimple'' crossed dipolar trap. The collisional processes between atoms which are trapped in reservoir non adiabatic way the dimple. trap can be provided either by dark SPOT Magneto Optical Trap, (aberrated) laser beam itself or quadrupolar quadratic magnetic Optimal parameters for dimple derived from thermodynamical equations loading time, including possible inelastic Majorana losses. at relatively high temperature...
A theory is developed to explain the behavior of planar arrays microstrip dipoles. Relations are obtained involving active input impedances individual dipoles (thus recognizing effects mutual coupling) and radiating currents in resulting from a set impressed voltages. These relations permit establishment design procedure with goals an impedance match desired radiation pattern.
This paper presents the current status and future prospects of Space Atom Interferometer project (SAI), funded by European Agency. interferometry provides extremely sensitive accurate tools for measurement inertial forces. Operation atom interferometers in microgravity is expected to enhance performance such sensors. Main goal SAI demonstrate possibility placing space. The resulting drop-tower compatible acceleration sensor prototype described. Expected limits potential scientific...
An in vitro assay was used to quantitatively determine the ability of a variety bacteria adhere human corneal epithelial cells. Staphylococcus aureus, Streptococcus pneumoniae, and Pseudomonas aeruginosa were found epithelium significantly better than other species that tested. However, there considerable variability adherence individual strains these bacterial species. The results this study support hypothesis frequency with which certain cause ulceration may be related those organisms...
Experiments are described from which determination can be made of the self and mutual impedance for microstrip dipoles backscattering relation involving radiating current. Functional representations these sources input data then permits design planar dipole arrays, including effects coupling. The design, construction, performance a typical array described. Agreement between theory experiment is good.
The scattering from a slot discontinuity in rectangular waveguide can be described by an integral equation. This equation reduced to matrix form application of the well-known moment method technique. success this approach depends on convergence kernel, i.e., Green's dyadic. When dyadic is structured using modes, <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">\hat{z}\hat{z}</tex> component assured. However,...
We demonstrate a compact laser source suitable for trapping and cooling potassium. By frequency doubling fiber diode at 1534 nm in waveguide, we produce 767 light. A current modulation of the allows us to generate two required frequencies simple robust apparatus. successfully used this trap K39.
We realize a 1 W all-fibered polarized compact and robust laser source at 852 nm for cooling of cesium atoms. The architecture is based on the sum-frequency generation 1540 1908 lasers, realized through periodically poled lithium niobate waveguide with conversion efficiency 40%. A linewidth 20 kHz achieved development distributed feedback fiber nm. operation this demonstrated focused ion beam (FIB) experiment cold
Design techniques and procedures for microstrip dipole arrays transversely fed by proximity coupled lines are presented. Two design equations which include the effects of mutual coupling developed, corresponding curves obtained a rigorous integral equation solution. A seven-element standing wave linear array is designed to illustrate developed procedures. The data checked complete solution array, with good agreement. measurements radiation pattern input impedance found be in agreement goal.<...
The insertion loss of an experimental high-frequency fiberoptic link is reduced to 7 dB with 800-MHz (9%) 3-dB bandwidth at 9 GHz by improving the optical performance and using reactive passive RF impedance matching. signal-to-noise ratio measured found be about 125 dBc/Hz over bandwidth. This a significant improvement from typical X-band 40 could help open way many microwave applications links in radar avionics systems.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML"...
Long-standing practice has been to view a longitudinal slot in broad wall of rectangular waveguide as shunt element. This becomes more questionable assumption the b dimension guide is decreased and/or offset increased. A symmetrical T or <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">\pi</tex> model accurate. procedure for developing parameter values described. The further complication accounting external mutual coupling also discussed.