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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

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

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Nombre de fichiers déposés

63

Nombre de notices déposées

46