{"id":19246,"date":"2025-09-02T16:37:04","date_gmt":"2025-09-02T14:37:04","guid":{"rendered":"https:\/\/amplitude-laser.com\/applications\/%application_category%\/ultrafast-electron-microscopy\/"},"modified":"2025-09-02T18:10:09","modified_gmt":"2025-09-02T16:10:09","slug":"microscopie-electronique-ultra-rapide","status":"publish","type":"application","link":"https:\/\/amplitude-laser.com\/fr\/applications\/science-fr\/microscopie-electronique-ultra-rapide\/","title":{"rendered":"Microscopie \u00e9lectronique ultra-rapide"},"content":{"rendered":"\n<p><strong>La microscopie \u00e9lectronique \u00e0 transmission (MET) est une technique d&rsquo;imagerie tr\u00e8s puissante qui utilise la transmission d&rsquo;un faisceau d&rsquo;\u00e9lectrons \u00e0 travers un \u00e9chantillon mince pour g\u00e9n\u00e9rer une image 3D \u00e0 l&rsquo;\u00e9chelle atomique. La r\u00e9solution temporelle est assur\u00e9e par l&rsquo;utilisation de lasers \u00e0 impulsions courtes tels que les Satsuma, SatsumaX et Tangor. Dans la plupart des cas, le faisceau d&rsquo;\u00e9lectrons est ensuite g\u00e9n\u00e9r\u00e9 par la deuxi\u00e8me (SHG) ou la troisi\u00e8me (THG) harmonique de ces lasers ultra-stables et \u00e0 haute fr\u00e9quence de r\u00e9p\u00e9tition.<\/strong><\/p>\n\n\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:60%\">\n<h2 class=\"wp-block-heading\">Dynamique structurelle ultrarapide avec diffraction des rayons X<\/h2>\n\n\n\n<p>La diffraction des rayons X est une technique qui fournit des informations sur la dynamique ultra-rapide de la structure de la mati\u00e8re \u00e0 l&rsquo;\u00e9chelle atomique. L&rsquo;\u00e9chantillon est g\u00e9n\u00e9ralement excit\u00e9 par une premi\u00e8re impulsion laser ultra-courte dans l&rsquo;ultraviolet, le visible, l&rsquo;infrarouge moyen ou m\u00eame le t\u00e9rahertz, puis sond\u00e9 par un faisceau de rayons X synchrotron ou \u00e0 \u00e9lectrons libres, ou encore par une source de rayons X compacte aliment\u00e9e par laser, comme pr\u00e9sent\u00e9 dans la section Sources secondaires &#8211; Sources de rayons X.<\/p>\n\n\n\n<p>Lorsque la pompe et la sonde sont produites par deux syst\u00e8mes distincts, le balayage temporel est effectu\u00e9 \u00e0 l&rsquo;aide d&rsquo;une synchronisation \u00e9lectronique du laser esclave (g\u00e9n\u00e9ralement la pompe) avec la source ma\u00eetre (g\u00e9n\u00e9ralement la sonde).<\/p>\n\n\n\n<p>Dans le cas de sources laser pour la pompe et la sonde, la synchronisation est intrins\u00e8quement ultrapr\u00e9cise, et le balayage est r\u00e9alis\u00e9 \u00e0 l&rsquo;aide d&rsquo;une simple ligne \u00e0 retard optique variable avec une pr\u00e9cision de l&rsquo;ordre de la femtoseconde. Amplitude propose une large gamme de solutions pour la pompe optique et la sonde \u00e0 rayons X et leur balayage temporel : sources OPCPA pomp\u00e9es par des lasers \u00e0 ytterbium, pilotes laser pour sources de rayons X laser, lasers \u00e0 photocathode pour FEL\/synchrotron pour sources de rayons X bas\u00e9es sur des acc\u00e9l\u00e9rateurs. Dans chaque cas, la synchronisation \u00e9lectronique est une technologie cl\u00e9 pour assurer le balayage temporel.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:40%\"><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img decoding=\"async\" width=\"292\" height=\"267\" src=\"https:\/\/amplitude-laser.com\/wp-content\/uploads\/2025\/09\/schema-ultrafast-electron-microscopy-amplitude-laser.webp\" alt=\"Ultrafast electron microscopy schema - Amplitude Laser\" class=\"wp-image-19216\"\/><\/figure>\n<\/div>\n\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img decoding=\"async\" width=\"516\" height=\"372\" src=\"https:\/\/amplitude-laser.com\/wp-content\/uploads\/2025\/09\/ultrafast-electron-microscopy-amplitude-laser.webp\" alt=\"Ultrafast electron microscopy - Amplitude Laser\" class=\"wp-image-19220\" srcset=\"https:\/\/amplitude-laser.com\/wp-content\/uploads\/2025\/09\/ultrafast-electron-microscopy-amplitude-laser.webp 516w, https:\/\/amplitude-laser.com\/wp-content\/uploads\/2025\/09\/ultrafast-electron-microscopy-amplitude-laser-300x216.webp 300w\" sizes=\"(max-width: 516px) 100vw, 516px\" \/><\/figure>\n<\/div><\/div>\n<\/div>\n","protected":false},"featured_media":19221,"template":"","application_category":[114],"class_list":["post-19246","application","type-application","status-publish","has-post-thumbnail","hentry","application_category-science-fr"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Microscopie \u00e9lectronique ultra-rapide - Amplitude<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/amplitude-laser.com\/fr\/applications\/science-fr\/microscopie-electronique-ultra-rapide\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Microscopie \u00e9lectronique ultra-rapide - Amplitude\" \/>\n<meta property=\"og:description\" content=\"La microscopie \u00e9lectronique \u00e0 transmission (MET) est une technique d&rsquo;imagerie tr\u00e8s puissante qui utilise la transmission d&rsquo;un faisceau d&rsquo;\u00e9lectrons \u00e0 travers un \u00e9chantillon mince pour g\u00e9n\u00e9rer une image 3D \u00e0 l&rsquo;\u00e9chelle atomique. La r\u00e9solution temporelle est assur\u00e9e par l&rsquo;utilisation de lasers \u00e0 impulsions courtes tels que les Satsuma, SatsumaX et Tangor. 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