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