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Am 27. Juni starb Christoph (Chris) Meier, international anerkannter Spezialist für die Quantendynamik komplexer molekularer Systeme.

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Nous présentons une méthodologie de conception, basée sur une modélisation exacte de la diffraction par des réseaux, qui vise à concevoir des réseaux de diffraction qui satisfont aux exigences du piégeage atomique tout en tenant compte des contraintes et des tolérances de fabrication. Nos résultats montrent que des réseaux pertinents peuvent être facilement conçus à l'aide de cette méthode, et nous identifions des conceptions avec des tolérances de fabrication accrues et une meilleure résistance à l'imprécision, ce qui simplifie et augmente les chances de réaliser des pièges atomiques magnéto-optiques à réseaux (GMOTs) efficaces.

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We present a design strategy for grating magneto-optical traps (GMOTs). It takes the three most relevant optical properties for laser cooling (radiation pressure balance, specular reflection cancellation, and diffracted polarization) to build a scalar figure of merit. We use a rigorous coupled wave analysis (RCWA) simulation to find a geometry that maximizes this figure of merit. We also introduce a criterion that takes into account the robustness of the manufacturing processes to select a geometry that is reliable to manufacture. Finally, we demonstrate that the fabricated grating exhibits the expected optical properties and achieves typical GMOT performance.

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We have observed the decoherence of a lithium atomic wave during its propagation in the presence of the radiation emitted by tungsten-halogen lamps, i.e., decoherence induced by blackbody radiation. We used our atom interferometer to detect this decoherence by measuring the atom fringe-visibility loss. The absorption of a photon excites the atom, which spontaneously emits a fluorescence photon. The momenta of these two photons have random directions, and this random character is the main source of decoherence. All previous similar experiments used small-bandwidth coherent excitation by a laser, whereas incoherent radiation involves several technical and conceptual differences. Our approach is interesting as blackbody radiation is omnipresent and decoherence should be considered if particles resonant to electromagnetic fields are used.

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Sujets

Condensat de Bose-Einstein Geometric phases Diffraction atomique Atom inerteferometry Condensates Cold atoms Experiment Coupled oscillators Atom interferometer Frequency metrology Optique atomique Effet Stark Atomic polarisability Optical pumping Sagnac effect Close-coupling Polarisabilité Ring cavity Lithium Polarizability Coherence Parallel velocity Experimental results Atom diffraction Critical phenomena Amortissement Birefringence Vibrations Laser diffraction Effet Zeeman Condensats de Bose-Einstein Fringe contrast He-McKellar-Wilkens Collisions atome-atome Detector sensitivity Franges d'interférence Diode-pumped solid state lasers Dark matter Anisotropy CAVITY Cosmic string Atomic interferometry Friction Cohérence Matter wave Stark effect Diffraction laser Effet Aharonov-Bohm Interférométrie atomique Atom interferometry Black hole Cooling effect FIELD Electric polarizability Diffraction d'une onde atomique Electro-optics Topological phase Aharonov-Bohm Atom optics Diffraction Bose-Einstein condensate Adsorbats moléculaires Birefringences Aharonov-Casher Lithium atoms Compensation Zeeman effect Atom Optics Accurate measurement Non reciprocal effect Atome de lithium Aharonov-Bohm effect Interferometry Damping Laser cooling of atoms ATOMS Atom interferometers CERN Lab Fringe visibility Axion Atomic Bloch states Frequency doubling Fringevisibility Diffraction atomique par laser Bragg diffraction Mesures de précision Condensats Aharononov-Bohm Muonic hydrogen Fringe phase shift Détecteur à fil chaud Atom Phase géométrique Atomes froids Decoherence Diffraction de Bragg Magneto-optics Bose Einstein condensate Atom chip Atom Interferometry

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Nombre de fichiers déposés

63

Nombre de notices déposées

46