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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
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