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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 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