A5052006999- Atomic and Molecular Physics
- Laser-induced spectroscopy and plasma
- Advanced Chemical Physics Studies
- Photonic and Optical Devices
- Semiconductor Lasers and Optical Devices
- Cold Atom Physics and Bose-Einstein Condensates
- Historical Linguistics and Language Studies
- Advanced Fiber Optic Sensors
- Plasma Diagnostics and Applications
- Laser-Matter Interactions and Applications
- Laser Design and Applications
- Solid State Laser Technologies
- Optical Coatings and Gratings
- Advanced Fiber Laser Technologies
- Linguistics and Discourse Analysis
- Spectroscopy and Laser Applications
- Historical and Literary Studies
- Photonic Crystal and Fiber Optics
- Stellar, planetary, and galactic studies
- Laser-Plasma Interactions and Diagnostics
- Astrophysics and Star Formation Studies
- Education, sociology, and vocational training
- Medieval European Literature and History
- Magnetic confinement fusion research
- Spectroscopy and Quantum Chemical Studies
Laboratoire Interactions, Dynamiques et Lasers
2014-2024
CEA Paris-Saclay
2014-2024
Université Paris-Saclay
2011-2024
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2014-2024
Centre National de la Recherche Scientifique
2016-2022
CEA DAM Île-de-France
2021
Centre de Haute Energie
2011-2020
Institut Rayonnement-Matière de Saclay
2009-2019
Institut National d'Optique
1998-2018
Los Alamos National Laboratory
2015
2014 Une fluorescence bleue intense a été observée à la suite d'une excitation laser jaune orangé dans le multiplet 1D2 de l'ion Pr3+ LaF3.Cette présente une évolution temporelle différente lorsqu'on explore sélectivement raie d'absorption.Des techniques d'excitation résolue temps ont utilisées afin d'étudier cette évolution.Il est ainsi montré que les transferts d'énergie produisant sont très efficaces entre ions responsables raies satellites spectre d'absorption.Nous proposons un méca-...
Plasma environment effects on atomic structure are analyzed using various codes. To monitor the effect of high free-electron density or low temperatures, Fermi-Dirac and Maxwell-Boltzmann statistics compared. After a discussion implementation approach within ion-sphere model, several applications considered. In order to check consistency modifications brought here extant codes, calculations have been performed Los Alamos Cowan Atomic Structure (cats) code in its Hartree-Fock...
It is shown that the absorption of photons by electrons above ionisation threshold can take place through one- and two-step processes. These competing mechanisms show quite different features. Diagnostic methods based on intensity pressure dependences magnitude angular distribution probabilities are proposed.
This paper is devoted to the autoionization process of large-angular-momentum Rydberg states. After a brief account formalism in nonrelativistic theory and single-configuration approximation, we apply it atomic states with one electron large angular momentum. The dominant contribution direct exchange ignored. In this framework, width varies principal quantum number as ${n}^{\mathrm{\ensuremath{-}}3}$ exponentially When two excited electrons interact spherically symmetric core, demonstrated...
In order to design extreme ultraviolet (EUV) sources for nanolithography, xenon EUV emission has been experimentally studied in a plasma generated by the interaction of high-power laser with droplet jet. A theoretical model assuming that resulting is optically thick allows one find distribution relevant ions and transitions involved process. Atomic physics computations are performed using HULLAC code give detailed account involved. The importance 4p–4d, 4d–4f, 4d–5p stressed, as well need...
We report the observation of permanent photoinduced birefringence in a Ge-doped fiber exposed to cw mode locked at 532 nm. This effect is enhanced by increasing Ge concentration core fiber, or submitting it thermal hydrogen treatment. The however very weak, nonexistent, with irradiation 514 488 nm argon laser light.
Frequency multiplication of a microwave signal was achieved by modulating one arm dual-wavelength distibuted-feedback (DPB) laser device and injection locking the other on modulation sidebands. The consists two DFB lasers integrated with Y-junction combiner same semiconductor substrate, thus making compact (L=500 /spl mu/m). output allowed to beat high-speed photodetector. resulting had narrow line shape superimposed Lorentzian pedestal at multiple radio frequency. Three regimes operation...
This paper deals with theoretical studies on the $2p\ensuremath{-}3d$ absorption in iron, nickel, and copper plasmas related to LULI2000 (Laboratoire pour l'Utilisation des Lasers Intenses, 2000J facility) measurements which target temperatures were of order 20 eV plasma densities range 0.004--0.01 ${\mathrm{g}/\mathrm{cm}}^{3}$. The radiatively heated targets close local thermodynamic equilibrium (LTE). structure transitions has been studied help statistical superconfiguration opacity code...
The translation of CARS imaging towards real time, high resolution, chemically selective endoscopic tissue applications is limited by a lack sensitivity in scanning probes sufficiently small for incorporation into endoscopes.We have developed here custom double clad fiber (DCF)-based probe which designed to suppress the contaminant Four-Wave-Mixing (FWM) background generated within and integrated it based head few millimeters diameter.The DCF includes large mode area (LMA) core as first...
We report two experiments on UV light-induced bleaching of the 400-nm luminescence associated with 240-nm absorption band in Ge-doped optical fiber. have measured dynamics for different intensities and show that it is well fitted by a stretched exponential function, which indicates site-dependent rate. also shown anisotropic, confirming model defects having dipole moment aligned light polarization are preferentially excited bleached.
Density effects in plasmas are analyzed using a Thomas-Fermi approach for free electrons. First, scaling properties determined the free-electron potential and density. For hydrogen-like ions, first two terms of an analytical expansion this as function plasma coupling parameter obtained. In such from these numerical calculations, simple fit is proposed potential, which holds any electron density, temperature, atomic number, at least assuming that Maxwell-Boltzmann statistics applicable. This...
In connection with a recent experiment of vacuum-ultraviolet generation in multiphoton resonant ionization xenon at increasing pressure, model is elaborated to account for the simultaneous effect laser excitation tuned near three-photon resonance and pressure-induced emission from state ground state. Under certain assumptions usual various super-radiance treatments, system Bloch equations derived numerically solved. The dependence probability third-harmonic production versus interaction...
An InP based 4×4 Multi-Mode Interferometer 90° hybrid is described. The fabricated device showed a common mode rejection ratio in excess of 20 dB, and less than 1.5 dB variation responsivity over the C-band.
Opacity calculations are basic ingredients of stellar modelling. They play a crucial role in the interpretation acoustic modes detected by SoHO, COROT and KEPLER. In this review we present our activities on both theoretical experimental sides. We show new opacity spectra comparisons between eight groups who produce domain where experiments scheduled. Real differences noticed with real astrophysical consequences when one extends helioseismology to cluster studies different compositions. Two...
A general method is proposed to obtain the distribution of total quantum number $M$ for a set $N$ identical fermions with momentum $j$, which cornerstone nuclear shell model. This can be performed using recursive procedure on $N$, yielding closed-form expressions, are found linear combinations piecewise polynomials. We also highlight and implement in that framework two three-term recurrence relations over more convenient than Talmi's five-term has nevertheless already proved its worth past....
2014 Dans ce papier, nous presentons de nouvelles methodes d'attaque du problème l'observation d'une violation la parité dans les transitions magnétiques interdites d'atomes lourds.Le principe base est interférence entre l'amplitude dipolaire électrique induite par l'interaction avec courants neutres violant et un champ statique,.dans à seul photon nS ~ n' S. Le caractère nouveau des expériences discutées ici qu'elles nécessitent magnétique statique l'ordre kilogauss perpendiculaire au...
A collisional-radiative model describing nonlocal-thermodynamic-equilibrium plasmas is developed. It based on the HULLAC (Hebrew University Lawrence Livermore Atomic Code) suite for transitions rates, in zero-temperature radiation field hypothesis. Two variants of are presented: first one configuration averaged, while second a detailed level version. Comparisons made between them case carbon plasma; they show that configuration-averaged code gives correct results an electronic temperature...