A5032366764- Laser-Matter Interactions and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Frequency and Time Standards
- Atomic and Subatomic Physics Research
- Atomic and Molecular Physics
- Laser Design and Applications
- Laser-induced spectroscopy and plasma
- Mass Spectrometry Techniques and Applications
- Quantum optics and atomic interactions
- Spectroscopy and Quantum Chemical Studies
- Advanced Chemical Physics Studies
- Laser-Plasma Interactions and Diagnostics
- Advanced Fiber Laser Technologies
- Ion-surface interactions and analysis
- Scientific Measurement and Uncertainty Evaluation
- Geophysics and Sensor Technology
- Spectroscopy and Laser Applications
- Quantum Information and Cryptography
Systèmes de Référence Temps-Espace
2017-2023
Sorbonne Université
2017-2020
Université Paris Sciences et Lettres
2017-2020
Centre National de la Recherche Scientifique
2017-2020
Observatoire de Paris
2019-2020
Griffith University
2013-2016
Quantum (Australia)
2013-2016
ARC Centre of Excellence for Coherent X-ray Science
2016
Australian Research Council
2016
We search for transient variations of the fine structure constant using data from a European network fiber-linked optical atomic clocks. By searching coherent in recorded clock frequency comparisons across network, we significantly improve constraints on constant. For example, constrain variation alpha to <5*10^-17 transients duration 10^3 s. This analysis also presents possibility dark matter, mysterious substance hypothesised explain galaxy dynamics and other astrophysical phenomena that...
Ionization of atoms and molecules in strong laser fields is a fundamental process many research, especially the emerging field attosecond science. So far, demonstrably accurate data have only been acquired for atomic hydrogen (H), species that accessible to few investigators. Here, we present measurements ionization yield argon, krypton, xenon with percent-level accuracy, calibrated using H, regime widely used We derive transferable calibration standard peak intensity, 1.3%, based on simple...
Two-dimensional magneto-optical trapping (2D-MOT) is an efficient tool for generating a high flux of precooled atoms. A 2D-MOT mercury (Hg) so far missing despite the potential this atomic species in several areas. Here, we present characterization Hg enabled by addressing ${}^{1}{S}_{0}$- ${}^{3}{P}_{1}$ laser cooling transition at 254 nm. The source based on ytterbium-doped fiber amplifier has low-frequency noise and reliability. Parameters affecting efficiency are studied, i.e., optical...
Abstract We study transverse electron momentum distribution in strong field atomic ionization driven by laser pulses with varying ellipticity. show, both experimentally and theoretically, that the tunneling over barrier regimes evolves a qualitatively different way when ellipticity parameter describing polarization state of driving pulse increases.
We present results for controlled optical collisions of cold, metastable Ne atoms in a magneto-optical trap. The modification the ionizing collision rate is demonstrated using control laser tuned close to (3s)3P2 (3p)3D3 cooling transition. measured ionization spectrum does not contain resonances due formation photoassociated molecules connected Ω = 5 excited state potential as predicted by Doery et al (1998 Phys. Rev. A 57 3603–20). Instead, we observe broad unresolvable that well described...
We observe the population dynamics within a metastable neon magneto-optical trap (MOT) through measurement of average squared Clebsch-Gordan coefficient ${C}^{2}$ over range laser detunings. The magnitude is dependent on internal quantum state an atom interacting with light field and found to show strong dependence applied detuning. Previously it has been reported [Townsend et al., Phys. Rev. A 52, 1423 (1995)] that trapped atoms in MOT are pumped towards states interact most strongly local...
Abstract This work describes the first observations of ionisation neon in a metastable atomic state utilising strong-field, few-cycle light pulse. We compare to theoretical predictions based on Ammosov-Delone-Krainov (ADK) theory and solution time-dependent Schrödinger equation (TDSE). The TDSE provides better agreement with experimental data than ADK theory. optically pump target species measure rate as function different steady-state populations fine structure which shows significant...
We present the results of an investigation measurement transverse electron momentum (TEMD) distribution atoms ionized though interaction strong-field light pulses varying ellipticity. show experiment and theory that TEMD for tunneling regime over-the-barrier (OB) evolves in a qualitatively different way when polarization state ionizing laser changes
We study transverse electron momentum distribution (TEMD) in strong field atomic ionization driven by laser pulses with varying ellipticity. show, both experimentally and theoretically, that the TEMD tunneling over barrier regimes evolves a qualitatively different way when ellipticity parameter describing polarization state of driving pulse increases.
We present experimentally measured photoionization yields of atomic hydrogen as a function laser intensity for few-cycle pulses. Comparison data with exact ab-initio simulations produce better agreement than analytical theories and enable accurate calibration.
In this work we present results for the ionization of metastable neon with ultrashort laser pulses. addition to improving on accuracy previous measurements ion yield, show comparisons advanced TDSE based theory. This presents preliminary experimental evidence effects preparing target atoms into particular angular momentum projection (mj) states total yield.
The interactions of strong-field few-cycle laser pulses with metastable states noble gas atoms are examined. Metastable offer a combination low ionization potential and relatively simple atomic structure, making them excellent targets for examining dynamics in varying experimental conditions. A review the current work performed on is presented.
We present percent-level accurate ionisation yields of atomic hydrogen, argon, krypton, and xenon by few-cycle lasers. From these measurements, a peak laser intensity calibration standard is derived, to 1.3% in the 1014 W/cm2 regime.
This work describes the first observations of ionisation neon in a metastable atomic state utilising strong-field, few-cycle light pulse. We compare to theoretical predictions based on Ammosov-Delone-Krainov (ADK) theory and solution time-dependent Schrodinger equation (TDSE). The TDSE provides better agreement with experimental data than ADK theory. optically pump target species demonstrate that rate depends spin atoms provide physically transparent interpretation such dependence frameworks...
We present the measured photoionization yield of atomic hydrogen as a function laser intensity for few-cycle pulses. Fits with exact ab-initio simulations produce better agreement than analytical theories and enable accurate calibration.
We report on the recent improvements of optical lattice frequency standard at 1.1 PHz based <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">199</sup> Hg operating LNE-SYRTE. In particular we describe a locking scheme that allows us to trace trapping SI second down an accuracy 100 kHz, pushing limit corresponding term in clock error budget below 1 × 10 xmlns:xlink="http://www.w3.org/1999/xlink">−18</sup> . Furthermore will detail preliminary...
We report on the recent improvements of mercury optical lattice clock based <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">199</sup> Hg operating at LNESYRTE. In particular we describe how exploitation a 2D Magneto Optical Trap (2D-MOT) allowed us to increase significantly number useful atoms gathered in given time. As consequence were able decrease loading time clock, so as cycle time, that is main factor Dick effect.