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

Statistiques

Nombre de fichiers déposés

63

Nombre de notices déposées

46