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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

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

Statistiques

Nombre de fichiers déposés

63

Nombre de notices déposées

46