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