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