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Book Description
CETTE THESE S'INSCRIT DANS LE CADRE DES PROJETS DE GRANDS LASERS MEGAJOULES (LMJ EN FRANCE ET NIF AUX ETATS-UNIS) POUR LA FUSION PAR CONFINEMENT INERTIEL. DANS UN SCHEMA D'ATTAQUE INDIRECTE, LES FAISCEAUX LASER DOIVENT TRAVERSER 1 CM DE PLASMA SOUS-DENSE AVANT D'ATTEINDRE LES PAROIS DE LA CAVITE. LES CONDITIONS SONT ALORS REUNIES POUR QUE SE DEVELOPPENT LES INSTABILITES PARAMETRIQUES BRILLOUIN OU RAMAN, QUI PROVOQUENT UNE RETRODIFFUSION ANORMALE, SOURCE D'UNE IMPORTANTE PERTE D'ENERGIE. CE TRAVAIL S'ATTACHE A DECRIRE L'EFFET MODERATEUR DU LISSAGE SPATIO-TEMPOREL DU FAISCEAU LASER INCIDENT SUR LA RETRODIFFUSION. NOUS COMMENCONS PAR CARACTERISER LE PLASMA RENCONTRE, A PARTIR DE SIMULATIONS HYDRODYNAMIQUES, PUIS LA REPARTITION EN INTENSITE DU FAISCEAU LISSE, LA MAJEURE PARTIE DE LA PUISSANCE INCIDENTE ETANT LOCALISEE DANS DE NOMBREUSES SUR-INTENSITES LOCALES, LES POINTS CHAUDS. ON DEVELOPPE ENSUITE UN MODELE DE POINTS CHAUDS INDEPENDANTS QUI, CONNAISSANT LA FORME GENERIQUE D'UN POINT CHAUD, DECRIT LA CROISSANCE TRANSITOIRE DES INSTABILITES PARAMETRIQUES DE RETRODIFFUSION EN SON SEIN, ET PERMET D'OBTENIR UNE ESTIMATION DE LA REFLECTIVITE TOTALE EN MOYENNANT SUR LA DISTRIBUTION EN INTENSITE DE CES POINTS CHAUDS. CES CALCULS SONT FINALEMENT COMPARES A QUELQUES SIMULATIONS NUMERIQUES. ON RETIENDRA QUE LES EFFETS DE DIFFRACTION 3D PEUVENT REDUIRE FORTEMENT LA CROISSANCE DES INSTABILITES, CE PHENOMENE ETANT AMPLIFIE PAR LA FORME OBLONGUE DES POINTS CHAUDS. PAR AILLEURS, EN PARTICULIER POUR L'INSTABILITE DE RETRODIFFUSION BRILLOUIN, LE FAIBLE TEMPS DE COHERENCE (QQ PS) OBTENU PAR LISSAGE OPTIQUE PEUT STOPPER LA CROISSANCE DE L'INSTABILITE AVANT L'OBTENTION D'UN ETAT SATURE, ET CE MEME SI LE TAUX DE CROISSANCE INSTANTANE DE CELLE-CI EST SUPERIEUR A L'INVERSE DU TEMPS DE COHERENCE DU FAISCEAU LASER. AINSI, ON A MONTRE QUE LE LISSAGE SPATIO-TEMPOREL PEUT REDUIRE DIRECTEMENT LA REFLECTIVITE DES FAISCEAUX LASERS INCIDENTS, CE QUI LIMITE LES PERTES D'ENERGIE UTILE DANS UN SCHEMA D'ATTAQUE INDIRECTE.
Book Description
CETTE THESE S'INSCRIT DANS LE CADRE DES PROJETS DE GRANDS LASERS MEGAJOULES (LMJ EN FRANCE ET NIF AUX ETATS-UNIS) POUR LA FUSION PAR CONFINEMENT INERTIEL. DANS UN SCHEMA D'ATTAQUE INDIRECTE, LES FAISCEAUX LASER DOIVENT TRAVERSER 1 CM DE PLASMA SOUS-DENSE AVANT D'ATTEINDRE LES PAROIS DE LA CAVITE. LES CONDITIONS SONT ALORS REUNIES POUR QUE SE DEVELOPPENT LES INSTABILITES PARAMETRIQUES BRILLOUIN OU RAMAN, QUI PROVOQUENT UNE RETRODIFFUSION ANORMALE, SOURCE D'UNE IMPORTANTE PERTE D'ENERGIE. CE TRAVAIL S'ATTACHE A DECRIRE L'EFFET MODERATEUR DU LISSAGE SPATIO-TEMPOREL DU FAISCEAU LASER INCIDENT SUR LA RETRODIFFUSION. NOUS COMMENCONS PAR CARACTERISER LE PLASMA RENCONTRE, A PARTIR DE SIMULATIONS HYDRODYNAMIQUES, PUIS LA REPARTITION EN INTENSITE DU FAISCEAU LISSE, LA MAJEURE PARTIE DE LA PUISSANCE INCIDENTE ETANT LOCALISEE DANS DE NOMBREUSES SUR-INTENSITES LOCALES, LES POINTS CHAUDS. ON DEVELOPPE ENSUITE UN MODELE DE POINTS CHAUDS INDEPENDANTS QUI, CONNAISSANT LA FORME GENERIQUE D'UN POINT CHAUD, DECRIT LA CROISSANCE TRANSITOIRE DES INSTABILITES PARAMETRIQUES DE RETRODIFFUSION EN SON SEIN, ET PERMET D'OBTENIR UNE ESTIMATION DE LA REFLECTIVITE TOTALE EN MOYENNANT SUR LA DISTRIBUTION EN INTENSITE DE CES POINTS CHAUDS. CES CALCULS SONT FINALEMENT COMPARES A QUELQUES SIMULATIONS NUMERIQUES. ON RETIENDRA QUE LES EFFETS DE DIFFRACTION 3D PEUVENT REDUIRE FORTEMENT LA CROISSANCE DES INSTABILITES, CE PHENOMENE ETANT AMPLIFIE PAR LA FORME OBLONGUE DES POINTS CHAUDS. PAR AILLEURS, EN PARTICULIER POUR L'INSTABILITE DE RETRODIFFUSION BRILLOUIN, LE FAIBLE TEMPS DE COHERENCE (QQ PS) OBTENU PAR LISSAGE OPTIQUE PEUT STOPPER LA CROISSANCE DE L'INSTABILITE AVANT L'OBTENTION D'UN ETAT SATURE, ET CE MEME SI LE TAUX DE CROISSANCE INSTANTANE DE CELLE-CI EST SUPERIEUR A L'INVERSE DU TEMPS DE COHERENCE DU FAISCEAU LASER. AINSI, ON A MONTRE QUE LE LISSAGE SPATIO-TEMPOREL PEUT REDUIRE DIRECTEMENT LA REFLECTIVITE DES FAISCEAUX LASERS INCIDENTS, CE QUI LIMITE LES PERTES D'ENERGIE UTILE DANS UN SCHEMA D'ATTAQUE INDIRECTE.
Author: Fabio Remondino Publisher: Springer Science & Business Media ISBN: 3642275230 Category : Technology & Engineering Languages : en Pages : 243
Book Description
Today the cost of solid-state two-dimensional imagers has dramatically dropped, introducing low cost systems on the market suitable for a variety of applications, including both industrial and consumer products. However, these systems can capture only a two-dimensional projection (2D), or intensity map, of the scene under observation, losing a variable of paramount importance, i.e., the arrival time of the impinging photons. Time-Of-Flight (TOF) Range-Imaging (TOF) is an emerging sensor technology able to deliver, at the same time, depth and intensity maps of the scene under observation. Featuring different sensor resolutions, RIM cameras serve a wide community with a lot of applications like monitoring, architecture, life sciences, robotics, etc. This book will bring together experts from the sensor and metrology side in order to collect the state-of-art researchers in these fields working with RIM cameras. All the aspects in the acquisition and processing chain will be addressed, from recent updates concerning the photo-detectors, to the analysis of the calibration techniques, giving also a perspective onto new applications domains.
Author: Gian-Franco Dalla Betta Publisher: BoD – Books on Demand ISBN: 953307163X Category : Technology & Engineering Languages : en Pages : 482
Book Description
Photodiodes, the simplest but most versatile optoelectronic devices, are currently used in a variety of applications, including vision systems, optical interconnects, optical storage systems, photometry, particle physics, medical imaging, etc. Advances in Photodiodes addresses the state-of-the-art, latest developments and new trends in the field, covering theoretical aspects, design and simulation issues, processing techniques, experimental results, and applications. Written by internationally renowned experts, with contributions from universities, research institutes and industries, the book is a valuable reference tool for students, scientists, engineers, and researchers.
Author: Publisher: Academic Press ISBN: 0123876966 Category : Science Languages : en Pages : 593
Book Description
Single-photon generation and detection is at the forefront of modern optical physics research. This book is intended to provide a comprehensive overview of the current status of single-photon techniques and research methods in the spectral region from the visible to the infrared. The use of single photons, produced on demand with well-defined quantum properties, offers an unprecedented set of capabilities that are central to the new area of quantum information and are of revolutionary importance in areas that range from the traditional, such as high sensitivity detection for astronomy, remote sensing, and medical diagnostics, to the exotic, such as secretive surveillance and very long communication links for data transmission on interplanetary missions. The goal of this volume is to provide researchers with a comprehensive overview of the technology and techniques that are available to enable them to better design an experimental plan for its intended purpose. The book will be broken into chapters focused specifically on the development and capabilities of the available detectors and sources to allow a comparative understanding to be developed by the reader along with and idea of how the field is progressing and what can be expected in the near future. Along with this technology, we will include chapters devoted to the applications of this technology, which is in fact much of the driver for its development. This is set to become the go-to reference for this field. - Covers all the basic aspects needed to perform single-photon experiments and serves as the first reference to any newcomer who would like to produce an experimental design that incorporates the latest techniques - Provides a comprehensive overview of the current status of single-photon techniques and research methods in the spectral region from the visible to the infrared, thus giving broad background that should enable newcomers to the field to make rapid progress in gaining proficiency - Written by leading experts in the field, among which, the leading Editor is recognized as having laid down the roadmap, thus providing the reader with an authenticated and reliable source
Author: LAURENT.. DIVOL
Author: LAURENT.. DIVOL
Author: Fabio Remondino
Author: Gian-Franco Dalla Betta
Author: