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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

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

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Nombre de notices déposées

46