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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.
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.
This document presents a summary of the 2023 Terrestrial Very-Long-Baseline Atom Interferometry Workshop hosted by CERN. The workshop brought together experts from around the world to discuss the exciting developments in large-scale atom interferometer (AI) prototypes and their potential for detecting ultralight dark matter and gravitational waves. The primary objective of the workshop was to lay the groundwork for an international TVLBAI proto-collaboration. This collaboration aims to unite researchers from different institutions to strategize and secure funding for terrestrial large-scale AI projects. The ultimate goal is to create a roadmap detailing the design and technology choices for one or more km-scale detectors, which will be operational in the mid-2030s. The key sections of this report present the physics case and technical challenges, together with a comprehensive overview of the discussions at the workshop together with the main conclusions.
We report here on the realization of light-pulse atom interferometers with large-momentum-transfer atom optics based on a sequence of Bragg transitions. We demonstrate momentum splitting up to 200 photon recoils in an ultracold atom interferometer. We highlight a new mechanism of destructive interference of the losses leading to a sizable efficiency enhancement of the beam splitters. We perform a comprehensive study of parasitic interferometers due to the inherent multiport feature of the quasi-Bragg pulses. Finally, we experimentally verify the phase shift enhancement and characterize the interferometer visibility loss
Sujets
Electric polarizability
Bose Einstein condensate
Détecteur à fil chaud
Polarisabilité
ATOMS
Atom interferometry
Optique atomique
CERN Lab
Lithium
Bose-Einstein condensate
Diode-pumped solid state lasers
Axion
Atomic polarisability
Atom diffraction
Aharononov-Bohm
Atome de lithium
Critical phenomena
Accurate measurement
Electro-optics
Cold atoms
Atom
Atom optics
Diffraction atomique par laser
Effet Stark
Condensat de Bose-Einstein
Mesures de précision
Diffraction d'une onde atomique
Coherence
Black hole
Optical pumping
Atomic interferometry
Polarizability
Diffraction
Fringevisibility
Lithium atoms
Ring cavity
Diffraction de Bragg
Amortissement
Cohérence
Adsorbats moléculaires
Fringe contrast
Atomes froids
Dark matter
Interferometry
Compensation
Geometric phases
Condensats
Magneto-optics
Matter wave
Atom Interferometry
Birefringences
Phase géométrique
Diffraction atomique
Experiment
Effet Aharonov-Bohm
Collisions atome-atome
Laser diffraction
Vibrations
Fringe visibility
Non reciprocal effect
Experimental results
Laser cooling of atoms
Aharonov-Bohm
He-McKellar-Wilkens
Frequency doubling
Franges d'interférence
Coupled oscillators
Aharonov-Casher
Damping
Decoherence
Cosmic string
Effet Zeeman
Atom chip
Zeeman effect
Atom interferometers
Interférométrie atomique
FIELD
Condensats de Bose-Einstein
Friction
Sagnac effect
Anisotropy
Stark effect
Diffraction laser
Bragg diffraction
Fringe phase shift
Atom Optics
Aharonov-Bohm effect
Atom interferometer
Condensates
Atom inerteferometry
Atomic Bloch states
Cooling effect
Close-coupling
Detector sensitivity
Frequency metrology
Muonic hydrogen
Topological phase
CAVITY
Parallel velocity
Birefringence