A5005093448- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- High-pressure geophysics and materials
- Advanced X-ray Imaging Techniques
- Semiconductor Lasers and Optical Devices
- Photonic and Optical Devices
- Laser Design and Applications
- Particle Detector Development and Performance
- Magnetic confinement fusion research
- Atomic and Molecular Physics
- Superconducting Materials and Applications
- Plasma Diagnostics and Applications
- Advanced X-ray and CT Imaging
- Laser-Matter Interactions and Applications
- Near-Field Optical Microscopy
- Ion-surface interactions and analysis
- Advancements in Photolithography Techniques
- Semiconductor Quantum Structures and Devices
- Ocular and Laser Science Research
- Pulsed Power Technology Applications
- Electron and X-Ray Spectroscopy Techniques
- Particle Accelerators and Free-Electron Lasers
- Astrophysical Phenomena and Observations
- Advanced Surface Polishing Techniques
- Advanced Optical Sensing Technologies
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2004-2023
CEA DAM Île-de-France
2006-2023
Universität Ulm
2002-2010
Bruyère
2000
The first indirect drive Inertial Confinement Fusion (ICF) experiments on the Laser Megajoule facility were carried out with approximately 150 kJ of laser energy distributed 48 beams (12 quads) arranged in two cones. target consisted a gold vacuum rugby-shaped hohlraum and plastic capsule located at its center, filled deuterium gas fuel. arrangement 12 quads is such that irradiation wall generated three-dimensional (3D) x-ray flux around creating 3D deformations imploding shell. This...
The diagnostic designs for the Laser Megajoule (LMJ) will require components to operate in environments far more severe than those encountered present facilities. This harsh environment be induced by fluxes of neutrons, gamma rays, energetic ions, electromagnetic radiations, and, some cases, debris and shrapnel, at levels several orders magnitude higher experienced today on existing lessons learned about vulnerabilities parts fielded mainly OMEGA many years, have been very useful guide...
The Laser Megajoule (LMJ) facility located at CEA/CESTA started to operate in the early 2014 with two quadruplets (20 kJ 351 nm) focused on target for first experimental campaign. We present here set of gated x-ray imaging (GXI) diagnostics implemented LMJ since mid-2014. This consists spatial, temporal, and broadband spectral resolution. These will give basic measurements, during entire life facility, such as position, structure, balance beams, but they also be used characterize gas filled...
This article describes x-ray imaging with grazing-incidence microscopes, developed for the experimental program carried out on Ligne d’Intégration Laser (LIL) facility [J. P. Le Breton et al., Inertial Fusion Sciences and Applications 2001 (Elsevier, Paris, 2002), pp. 856–862] (24kJ, UV—0.35nm). The design includes a large target-to-microscope (400–700mm) distance required by ablation issues anticipated MégaJoule [P. A. Holstein Part. Beams 17, 403 (1999)] (1.8MJ) which is under...
The Laser Integration Line (LIL) is part of the Megajoule (LMJ) project. LMJ installation, which National Ignition Facility (NIF) class, will deliver 1.8MJ at 0.35μm wavelength on target with 60 quadruplets elementary beams. energy LIL 30kJ corresponding to one quadruplet, it housed in a separate building and has its own experimental setup. Target diagnostics have been progressively installed area. Energy imaging as well broadband high resolution spectrometers fabricated frame unique...
We detail results of an experiment performed at the Laser Mégajoule facility aimed studying transition from supersonic radiation front to shock in a low density CHOBr foam enclosed plastic tube driven by thermal emission produced laser heated spherical gold cavity. Time resolved 2D hard x-ray radiography imaging using Sc source (photon energy ∼4.3 keV) is employed measure perturbation position, absorption, curvature, and shocked material compression (defined as compressed normalized its...
In this paper, we present a carefully elaborated layer design for semiconductor disk lasers. Experimental results of devices mounted on simple copper heat spreaders reveal conversion efficiency 54% at 13.2 W 970-nm wavelength laser emission and differential quantum 73%.
The time resolved crystal x-ray spectrometers called SXDHR-lt of the Ligne d’Intégration laser is presented. It necessary to calibrate all sensitive elements diagnostics before using them in matter interaction experiments. In particular, crystals need be calibrated. Measurements integrated coefficient reflection a beryl cylindrical used this spectrometer were performed with synchrotron radiation and an tube are A test homogeneity was also performed. Aging or accidental pollution installed...
The Ligne d'Integration Laser (LIL) facility has been designed as a prototype for the MegaJoule (LMJ) which is cornerstone of French 'Simulation Program'. This laser intensively used to test and improve LMJ components. In addition, large panel plasma diagnostics installed currently perform laser–plasma experiments. After brief discussion about LIL design, we present last results in various physics domains.
Since the first experimental campaign conducted in 2014 with mid field Gated X-ray Imager (GXI) and two quadruplets (20 kJ at 351 nm) focused on target, Laser MégaJoule (LMJ) operational capability is still growing up. New plasma diagnostics have been implemented: a large 2D GXI, broadband x-ray spectrometers (called DMX miniDMX), specific soft spectrometer Entrance Hole (LEH) imaging diagnostic. A series of experiments performed leading to more than 60 shots target. We will present...
Abstract This contribution reports on a GaN sapphire mesa technology for lattice matched InAlN/GaN HEMTs similar to silicon insulator technology. Ultrathin buffer layers between 500 nm and 100 have been deep etched down the substrate avoid cross talk devices through provide full transparency outside active device area (of special interest biochemical sensor applications).The heterostructure characteristics were: N S > 1.6 x 10 13 cm ‐2 , R sh < 600 Ω/□. 0.25 µm gate length HEMT are...
With regards to the future Laser Megajoules french facility (LMJ), our laboratory is developing advanced time-resolved High Resolution X-ray Imaging (HRXI) systems diagnose laser produced plasma. Shrapnel and loading on this imposes place any HRXI as far away from source possible. Grazing incidence microscopes are best solution overpass limitation. These imagers combine therefore grazing microscope camera. We designed imaging diagnostics, mainly with a long working distance (> 50 cm) high...
Densely packed arrays of vertical-cavity surface-emitting lasers (VCSELs) are presented, serving as low-cost and small-sized laser sources in optical particle manipulation systems. A novel, self-aligned fabrication process enables both a pitch the 20 µm range selective surface etch for enhanced transverse singlemode emission. Homogeneous array performance output powers up to 3.8 mW observed. By inserting into an tweezer setup with external optics, multiple traps easily created....
Nous décrivons les premiers diagnostics X développés actuellement pour le LMJ. Ceux-ci sont principalement dédiés à la qualification de l'installation (mesure tache focale, contrôle du pointage et l'équilibrage des faisceaux), mais également au diagnostic cavité, transfert radiatif rendement conversion X), l'hydrodynamique (expériences radiographie d'instabilités hydrodynamiques) l'imagerie microballons DT. Ce premier lot comprend deux systèmes multi imagerie bidimensionnelle associés un...
Les miroirs multicouches interférentiels, constitués d'un empilement alternant des couches minces de matériaux lourds et légers, permettent, par un phénomène d'addition en phase rayons réfléchis à chaque interface, d'obtenir pouvoirs réflecteurs élevés dans le domaine X. Malheureusement les largeurs spectrales accessibles avec périodiques sont peu étendues, l'ordre quelques centaines d'eV aux énergies photons keV incompatibles fonctionnement large bande envisagé pour certains microscopes X...
We have fabricated arrays of top-emitting VCSELs with pitches down to 24 mum and an only 2 wide gap between the devices. For enhanced single-mode emission, inverted surface relief technique was applied on some The output facets then contain a shallow, circular etch in their center.
Previous experiments at 0.1 TW level have shown that stability and X-ray emission of fast Z -pinch could be significantly improved by imploding an Al vapor jet onto a very thin coaxial wire (Wessel et al. , 1992). Here we present the first results using similar liner but mega-ampere level. The pinch is driven AMBIORIX facility, 2 TW, 0.5 Ω, MA, 50-ns pulse-line generator. We study effect its diameter (20–50 μm) on implosion dynamics, yield, on-axis magnetohydrodynamics (MHD) stability,...
Cet article traite du dimensionnement des diagnostics imageurs X à haute résolution spatiale (≤ 10μm) conçus et développés pour le Laser MégaJoule. On introduira ceux-ci en abordant les objectifs physiques expériences mettant jeu ces ainsi que l'environnement hostile dans lequel ils seront susceptibles de travailler. étudiera concepts géométriques liés au caractère imageurs. Enfin, on s'attachera l'aspect particulier la conception imageant rayons avec une bande passante allant jusqu'à 20 keV.
We report on bottom emitting oxide confined InGaAs MQW VCSEL arrays with high packing densities at 980 nm wavelength. CW output powers of 560 mW room temperature resulting in 330 W/cm/sup 2/ spatially averaged optical power density are achieved using appropriate heat sinking.