Publications

2003

• Equation d'état et métallisation de l'eau comprimée par choc laser.
  
  • Henry Emeric
  , 2003. Résumé non disponible
• Nd:glass diode-pumped regenerative amplifier, multimillijoule short-pulse chirped-pulse-amplifier laser
  
  • Ribeyre Xavier
  • Videau Laurent
  • Migus Arnold
  • Mercier Raymond
  • Mullot Michel
  Optics Letters, Optical Society of America - OSA Publishing, 2003, 18 (15), pp.1374-1376. We have built a diode-pumped Nd:glass regenerative amplifier that is able to produce energies up to 20 mJ within a 470-fs pulse duration at a 1-Hz repetition rate. We obtained this amplifier by using specific intracavity components such as a phase mirror and a birefringent filter to generate a large spatial mode and a large spectral width. (10.1364/OL.28.001374)
  DOI : 10.1364/OL.28.001374
• Electron and photon production from relativistic laser–plasma interactions
  
  • Lefebvre E.
  • Cochet N.
  • Fritzler S.
  • Malka Victor
  • Aleonard M.-M.
  • Chemin J.-F.
  • Darbon S.
  • Disdier L.
  • Faure Jérôme
  • Fedotoff A.
  • Landoas O.
  • Malka G.
  • Meot V.
  • Morel Pierre
  • Rabec Le Gloahec M.
  • Rouyer A.
  • Rubbelynck Ch.
  • Tikhonchuk V.
  • Wrobel R.
  • Audebert P.
  • Rousseaux C.
  Nuclear Fusion, IOP Publishing, 2003, 43 (7), pp.629. The interaction of short and intense laser pulses with plasmas is a very efficient source of relativistic electrons with tunable properties. In low-density plasmas, we observed bunches of electrons up to 200 MeV, accelerated in the wakefield of the laser pulse. Less energetic electrons (tens of megaelectronvolt) have been obtained, albeit with a higher efficiency, during the interaction with a pre-exploded foil or a solid target. When these relativistic electrons slow down in a thick tungsten target, they emit very energetic Bremsstrahlung photons which have been diagnosed directly with photoconductors, and indirectly through photonuclear activation measurements. Dose, photoactivation, and photofission measurements are reported. These results are in reasonable agreement, over three orders of magnitude, with a model built on laser–plasma interaction and electron transport numerical simulations. (10.1088/0029-5515/43/7/317)
  DOI : 10.1088/0029-5515/43/7/317
• Production and perception of grip force without proprioception: is there a sense of effort in deafferented subjects?
  
  • Lafargue Gilles
  • Paillard Jacques
  • Lamarre Yves
  • Sirigu Angela
  European Journal of Neuroscience, Wiley, 2003, 17 (12), pp.2741-9. We assessed the ability of healthy subjects (n = 7) and a patient deprived of proprioception (GL) to produce and assess different levels of isometric forces. They first produced a target force with one hand (the reference control hand) and then, after a delay of 3 s, they attempted to match it with the other hand (the experimental matching hand). Despite abnormal variations in motor outputs, we found that GL could, as could the control subjects, maintain a constant relationship between the force exerted by the control hand and the force exerted by the experimental hand. As GL was deprived of proprioceptive cues, these results suggest that she indirectly perceived muscular force through central effort. Interestingly, when carrying out the task the patient reported neither feelings of fatigue nor awareness of how hard she tried to perform the matches. Hence, under certain circumstances (such as in our motor task), it seems possible to assess and scale muscular force on the basis of endogenous signals only. However, internally generated signals related to the size of the motor command may need to interact with afferent input to gain full access to consciousness.
• Production d'électrons relativistes par interaction laser-plasma et application à la génération d'impulsions femtosecondes d'X dans le domaine du keV
  
  • Marques J.R.
  • David P.-G.
  • Faure Jérôme
  • Fritzler S.
  • Malka Victor
  • Najmudin Z.
  • Rousse Antoine
  • Ta Phuoc Kim
  • Walton B.
  Journal de Physique IV Proceedings, EDP Sciences, 2003, 108, pp.143-146. Nous avons étudié la production de particules énergétiques par l'interaction d'un laser ultra-bref et intense avec un plasma issu de l'ionisation laser d'un jet de gaz. A haute densité électronique ( ne > 10^19 cm^-3) un faisceau d'électrons relativistes est produit par sillage laser auto-modulé. A basse densité plasma ( ne > 10^19 cm^-3) un faisceau de rayons X est produit par émission Larmor des électrons du plasma oscillants dans te champ laser. Nous avons étudié les distributions en énergies et en angles de ces deux de faisceaux de particules. Les distributions angulaires sont gaussiennes et orientées suivant l'axe laser. La distribution en énergie du faisceau d'X est large, piquée autour de 0.15 keV, et s'étend jusqu'à 2 keV. Celle du faisceau d'électrons est maxwellienne de température eV. Ces résultats ont été obtenus avec un laser 10 Hz, ouvrant la porte à de nombreuses applications. (10.1051/jp4:20030615)
  DOI : 10.1051/jp4:20030615
• Transport d'électrons relativistes dans une cible solide : Etude du chauffage dans le cadre de l'allumage rapide.
  
  • Martinolli Emanuele
  , 2003. Ce travail de these s'inscrit dans le contexte des recherches sur la fusion par confinement inertiel. Il concerne plus particulierement le schema de l'allumage rapide, qui prevoit l'utilisation d'impulsions laser ultra-intenses pour amorcer les reactions nucleaires dans le combustible. Jusqu'a present, la faisabilite de ce scenario n'a pas encore ete prouvee. Il depend de nombreux aspects fondamentaux de la physique mise en jeu, qui ne sont pas encore entierement maıtrises. Dans ce travail, nous nous sommes proposes d'etudier experimentalement un des aspects fondamentaux de ce nouveau schema : le transport d'energie par les electrons relativistes crees par un faisceau laser ultra-intense.
• Enhanced Spatiotemporal Laser-Beam Smoothing in Gas-Jet Plasmas
  
  • Malka Victor
  • Faure Jérôme
  • Hüller Stefan
  • Tikhonchuk V. T.
  • Weber Sébastien J.
  • Amiranoff François
  Physical Review Letters, American Physical Society, 2003, 90 (7), pp.075002. Spatiotemporal smoothing of large-scale laser intensity fluctuations is observed for a laser beam focused into underdense helium plasmas. This smoothing is found to be severely enhanced when focusing the laser beam into a helium gas jet. In contrast to other experiments with preformed plasmas, the average and the peak laser intensities are well below the threshold for ponderomotive self-focusing. The coherence characteristics of the transmitted light are measured for various electron densities, and the smoothing effect is explained by multiple scattering of laser light on self-induced density perturbations. (10.1103/PhysRevLett.90.075002)
  DOI : 10.1103/PhysRevLett.90.075002
• Experimental and numerical studies of structure of cluster targets for femtosecond laser pulses
  
  • Boldarev A. S.
  • Gasilov V. A.
  • Blasco F.
  • Dorchies F.
  • Stenz C.
  , 2003, 5228, pp.446-454. no abstract
• Multi-keV picosecond x-ray source development from ultra-intense kHz laser-cluster interaction
  
  • Dorchies F.
  • Blasco F.
  • Bonte C.
  • Caillaud T.
  • Gauthier J. C.
  • Stenz C.
  • Stevefelt J.
  , 2003, 5196, pp.319-325. no abstract
• The effect of high intensity laser propagation instabilities on channel formation in underdense plasmas
  
  • Najmudin Z.
  • Krushelnick K.
  • Tatarakis M.
  • Clark E. L.
  • Danson C.N.
  • Malka Victor
  • Neely D.
  • Santala M. I. K.
  • Dangor A.E.
  Physics of Plasmas, American Institute of Physics, 2003, 10 (2), pp.438. Experiments have been performed using high power laser pulses (up to 50 TW) focused into underdense helium plasmas (ne ⩽ 5×10^19 cm^−3). Using shadowgraphy, it is observed that the laser pulse can produce irregular density channels, which exhibit features such as long wavelength hosing and “sausage-like” self-focusing instabilities. This phenomenon is a high intensity effect and the characteristic period of oscillation of these instabilities is typically found to correspond to the time required for ions to move radially out of the region of highest intensity. (10.1063/1.1534585)
  DOI : 10.1063/1.1534585
• Medical imaging with X-ray sources created by laser
  
  • Dorchies F.
  • Chen L. M.
  • Ichalalene Z.
  • Jiang Z.
  • Kieffer J. C.
  • Chamberlain C. C.
  • Krol A.
  Journal de Physique IV Proceedings, EDP Sciences, 2003, 108, pp.147-153. no abstract
• Polychromatic x-ray production in helium from a femtosecond high-intensity laser system
  
  • Ta Phuoc Kim
  • Rousse Antoine
  • Notebaert L.
  • Pittman M.
  • Rousseau Jean-Philippe
  • Malka Victor
  • Fritzler S.
  • Sebban Stéphane
  • Balcou Philippe
  • Hulin D.
  • Marques J.R.
  • David P. G.
  Journal of the Optical Society of America B, Optical Society of America, 2003, 20 (1), pp.221-223. Polychromatic x-ray radiation has been produced during the relativistic interaction of a 50-TW femtosecond laser with a helium gas jet. We have characterized the spectrum and the angular distribution of the x-ray emission as well as its dependency on the laser polarization and on the plasma electronic density. We have observed a broad continuous spectrum peaking at 0.15 keV with a significant tail up to 2 keV. The radiation was fairly collimated. (10.1364/JOSAB.20.000221)
  DOI : 10.1364/JOSAB.20.000221
• Characterization of argon cluster jets for laser interaction studies
  
  • Blasco F.
  • Caillaud T.
  • Dorchies F.
  • Stenz C.
  • Stevefelt J.
  • Boldarev A. S.
  • Gasilov V. A.
  Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Elsevier, 2003, 205, pp.324-328. no abstract
• Measurement of the time-resolved X-ray emission of different elements irradiated with a subpicosecond high-power laser
  
  • Chenais-Popovics C.
  • Audebert P.
  • Nagels V.
  • Geindre J. P.
  • Gauthier J. C.
  • Gary S.
  • Girard F.
  • Dorchies F.
  • Shepherd R.
  • Peyrusse O.
  , 2003, 5196, pp.205-212. no abstract
• Measurement of the X-ray emission time of different elements irradiated with a subpicosecond laser
  
  • Chenais-Popovics C.
  • Dorchies F.
  • Audebert P.
  • Nagels V.
  • Geindre J. P.
  • Gauthier J. C.
  • Peyrusse O.
  • Gary S.
  • Girard F.
  Journal de Physique IV Proceedings, EDP Sciences, 2003, 108, pp.137-142. no abstract
• Extra ion feature of Thomson scattered light in the interaction of a 600 ps laser with helium gas jet
  
  • Malka Victor
  • de Wispelaere E.
  • Mounaix Ph.
  • Hüller Stefan
  • Amiranoff François
  • Dorchies F.
  • Modena A.
  Physics of Plasmas, American Institute of Physics, 2003, 10 (2), pp.495. The interaction of a 600 ps laser pulse at 0.53 μm wavelength with helium gas jet with an electron density of 8×10^19 cm^−3 has been studied. In this experiment the plasma parameters for density and temperature were well-defined via time-resolved Thomson scattering. Ion Thomson scattering measurements at 45° show two extra satellites which correspond to the rescattering of the Brillouin backscattered light off the thermal ion acoustic waves. Analysis of the relative amplitudes of these satellites gives a very high value of 65% of the instantaneous reflectivity at its maximum. Theoretical spectra are in good agreement with the experimental ones. (10.1063/1.1535417)
  DOI : 10.1063/1.1535417
• Spatial distribution of cluster size and density in supersonic jets as targets for intense laser pulses
  
  • Dorchies F.
  • Blasco F.
  • Caillaud T.
  • Stevefelt J.
  • Stenz C.
  • Boldarev A. S.
  • Gasilov V. A.
  Physical Review A : Atomic, molecular, and optical physics [1990-2015], American Physical Society, 2003, 68 (2). no abstract
• Dynamics of Al thin foils irradiated by a subpicosecond high intensity laser pulse
  
  • Gallant P.
  • Kieffer J. C.
  • Dorchies F.
  • Peyrusse O.
  Physics of Plasmas, American Institute of Physics, 2003, 10 (3), pp.577-580. no abstract
• X-ray spectromicroscopy of clusters heated by fs laser radiation
  
  • Faenov A. Y.
  • Magunov A. I.
  • Pikuz T. A.
  • Skobelev I. Y.
  • Blasco F.
  • Dorchies F.
  • Stenz C.
  • Salin F.
  • Junkel-Vives G. C.
  • Abdallah J.
  • Auguste T.
  • Dobosz S.
  • d'Oliveira P.
  • Hulin S.
  • Monot P.
  • Biémont É.
  • Quinet P.
  • Hansen S.
  • Shlyaptseva A.
  • Safronova U. I.
  • Fournier K. B.
  , 2003, 652, pp.404-414. no abstract
• Spectra of Laser Irradiated Xenon and Krypton in the Wavelength Range 0.5–1.0 nm
  
  • Nagels V.
  • Chenais-Popovics C.
  • Malka Victor
  • Gauthier J.C.
  • Bachelier A.
  • Wyart Jean-François
  Physica Scripta, IOP Publishing, 2003, 68 (4), pp.233. X-ray spectra of highly-ionized xenon and krypton measured in a laser-irradiated gas jet are presented with a main purpose of line identification. The spectral range of 0.5 to 1 nm was covered using two flat Bragg crystal spectrographs. The very rich spectra of xenon cover the transitions 3p–nd and 3d–nf, with n = 5 to 10, of Xe26+ to Xe30+ (Ni-like to Cr-like). Transitions 2p–nd and 2s–np with n = 3, 4 of Kr24+ to Kr28+ (Mg-like to O-like) have also been recorded, in a range covering some unidentified lines. Ab initio detailed calculations performed with the RELAC code have permitted to identify lines of Xe and Kr, including transitions which were measured but not identified until now. Ionic fractions were deduced by adjusting the experimental spectra with a least-squares fit based on the RELAC data. (10.1238/Physica.Regular.068a00233)
  DOI : 10.1238/Physica.Regular.068a00233
• X-ray spectroscopy of a thin foil plasma produced by a short-pulse high-intensity laser
  
  • Audebert P.
  • Nagels V.
  • Geindre J. P.
  • Dorchies F.
  • Peyrusse O.
  • Gary S.
  • Girard F.
  • Shepherd R.
  • Gauthier J. C.
  • Chenais-Popovics C.
  Journal of Quantitative Spectroscopy and Radiative Transfer, Elsevier, 2003, 81 (1-4), pp.19-30. no abstract
• Experimental study of K-shell X-ray emission from argon clusters irradiated by an ultra-intense laser pulse
  
  • Glinec Y.
  • Stenz C.
  • Stevefelt J.
  • Caillaud T.
  • Blasco F.
  • Dorchies F.
  Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Elsevier, 2003, 205, pp.329-333. no abstract
• Time-dependent study of K-shell satellite line structure from L-shell ions in ultra-short laser argon cluster experiments
  
  • Abdallah J.
  • Junkel-Vives G. C.
  • Faenov A. Y.
  • Skobelev I. Y.
  • Pikuz T. A.
  • Magunov A. I.
  • Blasco F.
  • Bonte C.
  • Dorchies F.
  • Caillaud T.
  • Salin C.
  • Stenz C.
  Journal of Quantitative Spectroscopy and Radiative Transfer, Elsevier, 2003, 81 (1-4), pp.3-12. no abstract
• Characterization of argon cluster jets for the study of laser-cluster interaction
  
  • Blasco F.
  • Caillaud T.
  • Dorchies F.
  • Stenz C.
  • Boldarev A. S.
  • Gasilov V. A.
  Journal de Physique IV Proceedings, EDP Sciences, 2003, 108, pp.199-202. no abstract
• Experimental study on X-ray emission of nanometric argon clusters irradiated with intense laser pulses
  
  • Caillaud T.
  • Blasco F.
  • Dorchies F.
  • Glinec Y.
  • Stenz C.
  • Stevefelt J.
  Journal de Physique IV Proceedings, EDP Sciences, 2003, 108, pp.203-206. no abstract