{"id":809,"date":"2016-07-08T11:58:57","date_gmt":"2016-07-08T09:58:57","guid":{"rendered":"https:\/\/www.labex-palm.fr\/generation-des-premiers-photons-uvx-et-caracterisation-de-la-structure-attoseconde\/"},"modified":"2019-07-10T14:53:00","modified_gmt":"2019-07-10T12:53:00","slug":"generation-des-premiers-photons-uvx-et-caracterisation-de-la-structure-attoseconde","status":"publish","type":"post","link":"https:\/\/www.labex-palm.fr\/en\/generation-des-premiers-photons-uvx-et-caracterisation-de-la-structure-attoseconde\/","title":{"rendered":"G\u00e9n\u00e9ration des premiers photons UVX et caract\u00e9risation de la structure attoseconde"},"content":{"rendered":"<div class=\"art-article\">\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" style=\"display: block; margin-left: auto; margin-right: auto;\" src=\"\/images\/highkights\/IMAPS\/IMAPS_1.png\" alt=\"IMAPS 1\" width=\"500\" height=\"312\"><\/p>\n<p style=\"text-align: center;\" align=\"center\"><span style=\"font-size: 8pt;\"><em>Figure 1&nbsp;: Spectre brut 2D et spectre int\u00e9gr\u00e9 spatialement et calibr\u00e9 en \u00e9nergie<\/em><\/span><\/p>\n<p style=\"text-align: justify;\">La structure attoseconde de l\u2019\u00e9mission harmonique a r\u00e9cemment \u00e9t\u00e9 caract\u00e9ris\u00e9e. Pour cela, la phase spectrale de la source harmonique a \u00e9t\u00e9 mesur\u00e9e \u00e0 l\u2019aide d\u2019un spectrom\u00e8tre \u00e0 temps de vol, en appliquant la technique RABBIT (Reconstruction of Attosecond Beating By Interference of two-photon Transitons). Le faisceau harmonique a \u00e9t\u00e9 pour cela refocalis\u00e9 dans un jet de gaz noble (ici de l\u2019argon) de fa\u00e7on \u00e0 induire un processus d\u2019ionisation. Le spectre d\u2019\u00e9nergie cin\u00e9tique des photo\u00e9lectrons, compos\u00e9 de pics s\u00e9par\u00e9s par deux fois la fr\u00e9quence laser, refl\u00e8te le spectre de la source. En combinant le faisceau harmonique avec un champ laser d\u2019intensit\u00e9 mod\u00e9r\u00e9 et de retard contr\u00f4l\u00e9, on observe l\u2019apparition de bandes lat\u00e9rales aux fr\u00e9quences paires du laser, dont l\u2019intensit\u00e9 d\u00e9pend de l\u2019interf\u00e9rence entre deux chemins quantiques : i) absorption simultan\u00e9e d\u2019un photon harmonique d\u2019ordre q et d\u2019un photon laser, et ii) absorption d\u2019un photon harmonique d\u2019ordre q+2 et \u00e9mission d\u2019un photon laser. L\u2019\u00e9volution de l\u2019intensit\u00e9 des bandes lat\u00e9rales en fonction du retard UVX-IR permet d\u2019acc\u00e9der \u00e0 la phase relative entre les ordres q et q+2, et ainsi de mesurer la phase spectrale de la source harmonique. Par transform\u00e9e de Fourier inverse de l\u2019amplitude et de la phase spectrale, on reconstruit le train d\u2019impulsions attosecondes correspondant. Une trace RABBIT typique mesur\u00e9e dans l\u2019argon est pr\u00e9sent\u00e9e en Figure 2.<\/p>\n<p style=\"line-height: 18px;\"><img decoding=\"async\" loading=\"lazy\" style=\"display: block; margin-left: auto; margin-right: auto;\" src=\"\/images\/highkights\/IMAPS\/IMAPS_2.png\" alt=\"IMAPS 2\" width=\"500\" height=\"280\"><\/p>\n<p style=\"text-align: center;\"><em><span style=\"font-size: 8pt;\"><\/span><span style=\"font-size: 8pt;\">Figure 2: Trace RABBIT prise dans l&#8217;argon, donnant acc\u00e8s \u00e0 la phase spectrale de l\u2019\u00e9mission harmonique. Elle&nbsp; permet ainsi de reconstruire le train d\u2019impulsions attosecondes correspondant.<\/span><\/em><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #1486d7;\">R\u00e9sultats obtenus dans le cadre du projet de chaire junior externe d&#8217;Antonin Borot intitul\u00e9 &#8221;&nbsp;<strong>Isolated Multiple Attosecond Pulse Source <\/strong><strong>(IMAPS)<\/strong>&nbsp;&#8221; financ\u00e9 par le th\u00e8me 3 du LabEx PALM et port\u00e9 par&nbsp;<span style=\"color: #1486d7; text-align: justify;\">Thierry Ruchon (LIDyL),<\/span> Pascal Sali\u00e8re (LIDyL), Rodrigo Lopez-Martens (LOA), Franck Delmotte (LCF).<\/span><\/p>\n<p style=\"line-height: 18px; text-align: center;\"><span style=\"text-align: center;\"><img decoding=\"async\" loading=\"lazy\" src=\"\/images\/stories\/Logo_labo\/LIDyL.jpg\" alt=\"LIDyL\" width=\"136\" height=\"75\">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;<img decoding=\"async\" loading=\"lazy\" src=\"\/images\/stories\/Logo_labo\/LOA.jpg\" alt=\"LOA\" width=\"150\" height=\"75\">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;<img decoding=\"async\" loading=\"lazy\" src=\"\/images\/stories\/Logo_labo\/LCF.png\" alt=\"LCF\" width=\"152\" height=\"75\"><\/span><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp; Figure 1&nbsp;: Spectre brut 2D et spectre int\u00e9gr\u00e9 spatialement et calibr\u00e9 en \u00e9nergie [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1454,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[43],"tags":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.8.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>G\u00e9n\u00e9ration des premiers photons UVX et caract\u00e9risation de la structure attoseconde - Labex-Palm<\/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:\/\/www.labex-palm.fr\/en\/generation-des-premiers-photons-uvx-et-caracterisation-de-la-structure-attoseconde\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"G\u00e9n\u00e9ration des premiers photons UVX et caract\u00e9risation de la structure attoseconde - Labex-Palm\" \/>\n<meta property=\"og:description\" content=\"&nbsp; 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