{"id":1096,"date":"2022-12-03T13:45:17","date_gmt":"2022-12-03T12:45:17","guid":{"rendered":"http:\/\/s848664668.onlinehome.fr\/Wordpress\/?p=1096"},"modified":"2025-10-06T00:34:54","modified_gmt":"2025-10-05T22:34:54","slug":"1096","status":"publish","type":"post","link":"https:\/\/www.swissrocketman.fr\/Wordpress\/?p=1096","title":{"rendered":"Laser femtoseconde DPSS\u00a0 \u00a0\u00ab\u00a0HIGH Q\u00a0\u00bb IC1030-100fs\u00a0 YAG:Yb"},"content":{"rendered":"<div class=\"flex_column av_one_full  flex_column_div av-zero-column-padding first  avia-builder-el-0  el_before_av_one_full  avia-builder-el-first  \" style='border-radius:0px; '><section class=\"av_textblock_section \"  itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock  '   itemprop=\"text\" ><h2><\/h2>\n<h1>Laser femtoseconde DPSS\u00a0 \u00a0\u00ab\u00a0HIGH Q\u00a0\u00bb IC1030-100fs\u00a0 Yb<\/h1>\n<\/div><\/section><\/div>\n<div class=\"flex_column av_one_full  flex_column_div av-zero-column-padding first  avia-builder-el-2  el_after_av_one_full  el_before_av_one_full  column-top-margin\" style='border-radius:0px; '><section class=\"av_textblock_section \"  itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock  '   itemprop=\"text\" ><h3 data-start=\"1056\" data-end=\"1314\">Les noms du type <strong data-start=\"1073\" data-end=\"1090\">IC-1030-100FS<\/strong> sugg\u00e8rent : centre \u00e0 <strong data-start=\"1112\" data-end=\"1123\">1030 nm<\/strong>, <strong data-start=\"1125\" data-end=\"1136\">~100 fs<\/strong> dur\u00e9e d\u2019impulsion. Voici les caract\u00e9ristiques typiques que l\u2019on trouve pour des oscillateurs femtoseconde 1030 nm ~100 fs (sources constructeur \/ annonces produits similaires) :<\/h3>\n<ul data-start=\"1316\" data-end=\"2182\">\n<li data-start=\"1316\" data-end=\"1402\">\n<h3 data-start=\"1318\" data-end=\"1402\"><strong data-start=\"1318\" data-end=\"1348\">Longueur d\u2019onde centrale :<\/strong> ~<strong data-start=\"1350\" data-end=\"1361\">1030 nm<\/strong>. <span class=\"\" data-state=\"closed\"><span class=\"ms-1 inline-flex max-w-full items-center relative top-&#091;-0.094rem&#093; animate-&#091;show_150ms_ease-in&#093;\" data-testid=\"webpage-citation-pill\"><a class=\"flex h-4.5 overflow-hidden rounded-xl px-2 text-&#091;9px&#093; font-medium transition-colors duration-150 ease-in-out text-token-text-secondary! bg-&#091;#F4F4F4&#093;! dark:bg-&#091;#303030&#093;!\" href=\"https:\/\/www.youtube.com\/watch?v=MwO1_8aNChM&amp;utm_source=chatgpt.com\" target=\"_blank\" rel=\"noopener\"><span class=\"relative start-0 bottom-0 flex h-full w-full items-center\"><span class=\"flex h-4 w-full items-center justify-between\"><span class=\"max-w-&#091;15ch&#093; grow truncate overflow-hidden text-center\">YouTube<\/span><span class=\"-me-1 flex h-full items-center rounded-full px-1 text-&#091;#8F8F8F&#093;\">+1<\/span><\/span><\/span><\/a><\/span><\/span><\/h3>\n<\/li>\n<li data-start=\"1403\" data-end=\"1529\">\n<h3 data-start=\"1405\" data-end=\"1529\"><strong data-start=\"1405\" data-end=\"1428\">Dur\u00e9e d\u2019impulsion :<\/strong> \u2248 <strong data-start=\"1431\" data-end=\"1441\">100 fs<\/strong> (ou \u00ab typique &lt;100 fs \u00bb pour certains mod\u00e8les). <span class=\"\" data-state=\"closed\"><span class=\"ms-1 inline-flex max-w-full items-center relative top-&#091;-0.094rem&#093; animate-&#091;show_150ms_ease-in&#093;\" data-testid=\"webpage-citation-pill\"><a class=\"flex h-4.5 overflow-hidden rounded-xl px-2 text-&#091;9px&#093; font-medium transition-colors duration-150 ease-in-out text-token-text-secondary! bg-&#091;#F4F4F4&#093;! dark:bg-&#091;#303030&#093;!\" href=\"https:\/\/www.youtube.com\/watch?v=MwO1_8aNChM&amp;utm_source=chatgpt.com\" target=\"_blank\" rel=\"noopener\"><span class=\"relative start-0 bottom-0 flex h-full w-full items-center\"><span class=\"flex h-4 w-full items-center justify-between overflow-hidden\"><span class=\"max-w-&#091;15ch&#093; grow truncate overflow-hidden text-center\">YouTube<\/span><\/span><\/span><\/a><\/span><\/span><\/h3>\n<\/li>\n<li data-start=\"1530\" data-end=\"1711\">\n<h3 data-start=\"1532\" data-end=\"1711\"><strong data-start=\"1532\" data-end=\"1556\">Taux de r\u00e9p\u00e9tition :<\/strong> oscillateurs fixes usuels 40\u201380 MHz (des gammes High-Q\/\u00e9quivalentes listent par ex. 50 MHz pour certains mod\u00e8les). <span class=\"\" data-state=\"closed\"><span class=\"ms-1 inline-flex max-w-full items-center relative top-&#091;-0.094rem&#093; animate-&#091;show_150ms_ease-in&#093;\" data-testid=\"webpage-citation-pill\"><a class=\"flex h-4.5 overflow-hidden rounded-xl px-2 text-&#091;9px&#093; font-medium transition-colors duration-150 ease-in-out text-token-text-secondary! bg-&#091;#F4F4F4&#093;! dark:bg-&#091;#303030&#093;!\" href=\"https:\/\/www.youtube.com\/watch?v=MwO1_8aNChM&amp;utm_source=chatgpt.com\" target=\"_blank\" rel=\"noopener\"><span class=\"relative start-0 bottom-0 flex h-full w-full items-center\"><span class=\"flex h-4 w-full items-center justify-between\"><span class=\"max-w-&#091;15ch&#093; grow truncate overflow-hidden text-center\">YouTube<\/span><span class=\"-me-1 flex h-full items-center rounded-full px-1 text-&#091;#8F8F8F&#093;\">+1<\/span><\/span><\/span><\/a><\/span><\/span><\/h3>\n<\/li>\n<li data-start=\"1712\" data-end=\"2038\">\n<h3 data-start=\"1714\" data-end=\"2038\"><strong data-start=\"1714\" data-end=\"1747\">Puissance moyenne de sortie :<\/strong> typique pour oscillateurs de table : <strong data-start=\"1785\" data-end=\"1813\">quelques centaines de mW<\/strong> \u00e0 <strong data-start=\"1816\" data-end=\"1834\">quelques watts<\/strong> selon la version (les syst\u00e8mes industriels \u00e0 haute puissance peuvent \u00eatre bien plus \u00e9lev\u00e9s, mais un oscillateur \u00ab 100 fs \u00bb de table est en g\u00e9n\u00e9ral &lt; a quelques W). <span class=\"\" data-state=\"closed\"><span class=\"ms-1 inline-flex max-w-full items-center relative top-&#091;-0.094rem&#093; animate-&#091;show_150ms_ease-in&#093;\" data-testid=\"webpage-citation-pill\"><a class=\"flex h-4.5 overflow-hidden rounded-xl px-2 text-&#091;9px&#093; font-medium transition-colors duration-150 ease-in-out text-token-text-secondary! bg-&#091;#F4F4F4&#093;! dark:bg-&#091;#303030&#093;!\" href=\"https:\/\/www.laserlabsource.com\/files\/pdfs\/solidstatelasersource_com\/product-22\/Fiber_Laser_Femtosecond_Laser_1030nm_30uJ_Calmar_Laser-1461549927.pdf?utm_source=chatgpt.com\" target=\"_blank\" rel=\"noopener\"><span class=\"relative start-0 bottom-0 flex h-full w-full items-center\"><span class=\"flex h-4 w-full items-center justify-between\"><span class=\"max-w-&#091;15ch&#093; grow truncate overflow-hidden text-center\">laserlabsource.com<\/span><span class=\"-me-1 flex h-full items-center rounded-full px-1 text-&#091;#8F8F8F&#093;\">+1<\/span><\/span><\/span><\/a><\/span><\/span><\/h3>\n<\/li>\n<li data-start=\"2039\" data-end=\"2182\">\n<h3 data-start=\"2041\" data-end=\"2182\"><strong data-start=\"2041\" data-end=\"2066\">Qualit\u00e9 de faisceau :<\/strong> TEM\u2080\u2080 tr\u00e8s bonne, M\u00b2 proche de 1 (sp\u00e9cification habituelle pour ces sources).<\/h3>\n<\/li>\n<\/ul>\n<\/div><\/section><\/div>\n<div class=\"flex_column av_one_full  flex_column_div av-zero-column-padding first  avia-builder-el-4  el_after_av_one_full  el_before_av_one_full  column-top-margin\" style='border-radius:0px; '><div  class='avia-image-container  av-styling-    avia-builder-el-5  avia-builder-el-no-sibling  avia-align-center '  itemprop=\"image\" itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/ImageObject\"  ><div class='avia-image-container-inner'><div class='avia-image-overlay-wrap'><img decoding=\"async\" class='wp-image-1098 avia-img-lazy-loading-not-1098 avia_image' src=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/Capture-decran-2022-12-03-133850-1.jpg\" alt='' title='Capture d\u2019\u00e9cran 2022-12-03 133850' height=\"799\" width=\"722\"  itemprop=\"thumbnailUrl\" srcset=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/Capture-decran-2022-12-03-133850-1.jpg 722w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/Capture-decran-2022-12-03-133850-1-271x300.jpg 271w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/Capture-decran-2022-12-03-133850-1-637x705.jpg 637w\" sizes=\"(max-width: 722px) 100vw, 722px\" \/><\/div><\/div><\/div><\/div>\n<div class=\"flex_column av_one_full  flex_column_div av-zero-column-padding first  avia-builder-el-6  el_after_av_one_full  el_before_av_one_half  column-top-margin\" style='border-radius:0px; '><section class=\"av_textblock_section \"  itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock  '   itemprop=\"text\" ><h3 data-start=\"2569\" data-end=\"2693\">Les designs courants pour ces lasers (High-Q et pairs) utilisent des \u00e9l\u00e9ments\/techniques r\u00e9currents \u2014 je r\u00e9sume ci-dessous :<\/h3>\n<ol data-start=\"2695\" data-end=\"4502\">\n<li data-start=\"2695\" data-end=\"2999\">\n<h3 data-start=\"2698\" data-end=\"2754\"><strong data-start=\"2698\" data-end=\"2752\">Milieu actif Yb (Ytterbium) \u2014 type solide ou fibre<\/strong><\/h3>\n<ul data-start=\"2758\" data-end=\"2999\">\n<li data-start=\"2758\" data-end=\"2999\">\n<h3 data-start=\"2760\" data-end=\"2999\">Beaucoup de lasers \u00e0 1030 nm utilisent un gain \u00e0 base d\u2019Yb (ex. Yb:YAG, Yb:KGW, ou fibres Yb-doped). C\u2019est courant pour obtenir 1 \u00b5m (\u22481030 nm) avec bonnes performances et possibilit\u00e9 de pompage diode.<\/h3>\n<\/li>\n<\/ul>\n<\/li>\n<li data-start=\"3001\" data-end=\"3303\">\n<h3 data-start=\"3004\" data-end=\"3043\"><strong data-start=\"3004\" data-end=\"3041\">Pompage par diodes (diode-pumped)<\/strong><\/h3>\n<ul data-start=\"3047\" data-end=\"3303\">\n<li data-start=\"3047\" data-end=\"3303\">\n<h3 data-start=\"3049\" data-end=\"3303\">Les oscillateurs et amplificateurs modernes sont habituellement <strong data-start=\"3113\" data-end=\"3129\">diode-pumped<\/strong> (efficace, compact, refroidissement plus simple). Les annonces produits High-Q et concurrents \u00e9voquent des modules diodes rempla\u00e7ables.<\/h3>\n<\/li>\n<\/ul>\n<\/li>\n<li data-start=\"3305\" data-end=\"3708\">\n<h3 data-start=\"3308\" data-end=\"3389\"><strong data-start=\"3308\" data-end=\"3387\">Mode-verrouillage passif (Saturable absorber \u2014 souvent SESAM ou \u00e9quivalent)<\/strong><\/h3>\n<ul data-start=\"3393\" data-end=\"3708\">\n<li data-start=\"3393\" data-end=\"3708\">\n<h3 data-start=\"3395\" data-end=\"3708\">Les oscillateurs femtoseconde de table sont souvent <strong data-start=\"3447\" data-end=\"3479\">passivement mode-verrouill\u00e9s<\/strong> \u00e0 l\u2019aide d\u2019un <strong data-start=\"3494\" data-end=\"3503\">SESAM<\/strong> (Saturable Absorber Mirror) ou d\u2019absorbeurs non-lin\u00e9aires int\u00e9gr\u00e9s. Le SESAM permet une g\u00e9n\u00e9ration stable d\u2019impulsions femtoseconde sans dispositif actif compliqu\u00e9.<\/h3>\n<\/li>\n<\/ul>\n<\/li>\n<li data-start=\"3710\" data-end=\"4042\">\n<h3 data-start=\"3713\" data-end=\"3765\"><strong data-start=\"3713\" data-end=\"3763\">Gestion de la dispersion + composants optiques<\/strong><\/h3>\n<ul data-start=\"3769\" data-end=\"4042\">\n<li data-start=\"3769\" data-end=\"4042\">\n<h3 data-start=\"3771\" data-end=\"4042\">Pour obtenir ~100 fs il faut compenser la dispersion du trajet optique (miroirs chirp\u00e9s, prismes, fibres avec compensation, etc.) et un r\u00e9seau de miroirs, montures de miroirs et optiques de focalisation comme visibles sur ta photo.<\/h3>\n<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<\/div><\/section><\/div>\n<div class=\"flex_column av_one_half  flex_column_div av-zero-column-padding first  avia-builder-el-8  el_after_av_one_full  el_before_av_one_half  column-top-margin\" style='border-radius:0px; '><div  class='avia-image-container  av-styling-    avia-builder-el-9  avia-builder-el-no-sibling  avia-align-center '  itemprop=\"image\" itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/ImageObject\"  ><div class='avia-image-container-inner'><div class='avia-image-overlay-wrap'><img decoding=\"async\" class='wp-image-1099 avia-img-lazy-loading-not-1099 avia_image' src=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/Capture-decran-2022-12-03-133931.jpg\" alt='' title='Capture d\u2019\u00e9cran 2022-12-03 133931' height=\"370\" width=\"494\"  itemprop=\"thumbnailUrl\" srcset=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/Capture-decran-2022-12-03-133931.jpg 494w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/Capture-decran-2022-12-03-133931-300x225.jpg 300w\" sizes=\"(max-width: 494px) 100vw, 494px\" \/><\/div><\/div><\/div><\/div>\n<div class=\"flex_column av_one_half  flex_column_div av-zero-column-padding   avia-builder-el-10  el_after_av_one_half  el_before_av_one_full  column-top-margin\" style='border-radius:0px; '><div  class='avia-image-container  av-styling-    avia-builder-el-11  avia-builder-el-no-sibling  avia-align-center '  itemprop=\"image\" itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/ImageObject\"  ><div class='avia-image-container-inner'><div class='avia-image-overlay-wrap'><img decoding=\"async\" class='wp-image-1100 avia-img-lazy-loading-not-1100 avia_image' src=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/Capture-decran-2022-12-03-134002.jpg\" alt='' title='Capture d\u2019\u00e9cran 2022-12-03 134002' height=\"373\" width=\"499\"  itemprop=\"thumbnailUrl\" srcset=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/Capture-decran-2022-12-03-134002.jpg 499w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/Capture-decran-2022-12-03-134002-300x224.jpg 300w\" sizes=\"(max-width: 499px) 100vw, 499px\" \/><\/div><\/div><\/div><\/div>\n<div class=\"flex_column av_one_full  flex_column_div av-zero-column-padding first  avia-builder-el-12  el_after_av_one_half  el_before_av_one_full  column-top-margin\" style='border-radius:0px; '><div  class='avia-image-container  av-styling-    avia-builder-el-13  avia-builder-el-no-sibling  avia-align-center '  itemprop=\"image\" itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/ImageObject\"  ><div class='avia-image-container-inner'><div class='avia-image-overlay-wrap'><img decoding=\"async\" class='wp-image-3199 avia-img-lazy-loading-not-3199 avia_image' src=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/Capture-decran-2024-01-21-110120.jpg\" alt='' title='Capture d\u2019\u00e9cran 2024-01-21 110120' height=\"857\" width=\"1640\"  itemprop=\"thumbnailUrl\" srcset=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/Capture-decran-2024-01-21-110120.jpg 1640w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/Capture-decran-2024-01-21-110120-300x157.jpg 300w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/Capture-decran-2024-01-21-110120-1030x538.jpg 1030w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/Capture-decran-2024-01-21-110120-768x401.jpg 768w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/Capture-decran-2024-01-21-110120-1536x803.jpg 1536w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/Capture-decran-2024-01-21-110120-1500x784.jpg 1500w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/Capture-decran-2024-01-21-110120-705x368.jpg 705w\" sizes=\"(max-width: 1640px) 100vw, 1640px\" \/><\/div><\/div><\/div><\/div>\n<div class=\"flex_column av_one_full  flex_column_div av-zero-column-padding first  avia-builder-el-14  el_after_av_one_full  el_before_av_one_full  column-top-margin\" style='border-radius:0px; '><div  class='avia-image-container  av-styling-    avia-builder-el-15  avia-builder-el-no-sibling  avia-align-center '  itemprop=\"image\" itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/ImageObject\"  ><div class='avia-image-container-inner'><div class='avia-image-overlay-wrap'><img decoding=\"async\" class='wp-image-3200 avia-img-lazy-loading-not-3200 avia_image' src=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/20240120_173954mm-scaled.jpg\" alt='' title='20240120_173954mm' height=\"1440\" width=\"2560\"  itemprop=\"thumbnailUrl\" srcset=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/20240120_173954mm-scaled.jpg 2560w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/20240120_173954mm-300x169.jpg 300w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/20240120_173954mm-1030x579.jpg 1030w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/20240120_173954mm-768x432.jpg 768w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/20240120_173954mm-1536x864.jpg 1536w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/20240120_173954mm-2048x1152.jpg 2048w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/20240120_173954mm-1500x844.jpg 1500w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/20240120_173954mm-705x397.jpg 705w\" sizes=\"(max-width: 2560px) 100vw, 2560px\" \/><\/div><\/div><\/div><\/div>\n<div class=\"flex_column av_one_full  flex_column_div av-zero-column-padding first  avia-builder-el-16  el_after_av_one_full  el_before_av_one_full  column-top-margin\" style='border-radius:0px; '><div  class='avia-image-container  av-styling-    avia-builder-el-17  avia-builder-el-no-sibling  avia-align-center '  itemprop=\"image\" itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/ImageObject\"  ><div class='avia-image-container-inner'><div class='avia-image-overlay-wrap'><img decoding=\"async\" class='wp-image-3201 avia-img-lazy-loading-not-3201 avia_image' src=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/20240120_174030-scaled.jpg\" alt='' title='20240120_174030' height=\"1440\" width=\"2560\"  itemprop=\"thumbnailUrl\" srcset=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/20240120_174030-scaled.jpg 2560w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/20240120_174030-300x169.jpg 300w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/20240120_174030-1030x579.jpg 1030w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/20240120_174030-768x432.jpg 768w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/20240120_174030-1536x864.jpg 1536w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/20240120_174030-2048x1152.jpg 2048w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/20240120_174030-1500x844.jpg 1500w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/20240120_174030-705x397.jpg 705w\" sizes=\"(max-width: 2560px) 100vw, 2560px\" \/><\/div><\/div><\/div><\/div>\n<div class=\"flex_column av_one_full  flex_column_div av-zero-column-padding first  avia-builder-el-18  el_after_av_one_full  el_before_av_one_half  column-top-margin\" style='border-radius:0px; '><section class=\"av_textblock_section \"  itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock  '   itemprop=\"text\" ><h2 data-start=\"248\" data-end=\"299\">\u2699\ufe0f 1. La cavit\u00e9 optique : un \u00e9quilibre ultra-fin<\/h2>\n<p data-start=\"300\" data-end=\"427\">Un laser femtoseconde est une <strong data-start=\"330\" data-end=\"350\">cavit\u00e9 r\u00e9sonante<\/strong> (souvent 10\u2013100 mm de long) o\u00f9 les faisceaux font des allers-retours entre :<\/p>\n<ul data-start=\"428\" data-end=\"581\">\n<li data-start=\"428\" data-end=\"494\">\n<p data-start=\"430\" data-end=\"494\">un <strong data-start=\"433\" data-end=\"458\">cristal amplificateur<\/strong> (Nd:YVO\u2084, Ti:saphir, Yb:KYW, etc.),<\/p>\n<\/li>\n<li data-start=\"495\" data-end=\"581\">\n<p data-start=\"497\" data-end=\"581\">et un <strong data-start=\"503\" data-end=\"529\">miroir de mode-locking<\/strong> (souvent un <strong data-start=\"542\" data-end=\"551\">SESAM<\/strong> ou une <strong data-start=\"559\" data-end=\"579\">lentille de Kerr<\/strong>).<\/p>\n<\/li>\n<\/ul>\n<h3 data-start=\"583\" data-end=\"608\">\u27a4 Alignement critique<\/h3>\n<ul data-start=\"609\" data-end=\"972\">\n<li data-start=\"609\" data-end=\"721\">\n<p data-start=\"611\" data-end=\"721\">La <strong data-start=\"614\" data-end=\"636\">position angulaire<\/strong> et <strong data-start=\"640\" data-end=\"657\">longitudinale<\/strong> des miroirs d\u00e9termine <strong data-start=\"680\" data-end=\"705\">le trajet du faisceau<\/strong> au micron pr\u00e8s.<\/p>\n<\/li>\n<li data-start=\"722\" data-end=\"972\">\n<p data-start=\"724\" data-end=\"769\">Si la cavit\u00e9 n\u2019est pas parfaitement align\u00e9e :<\/p>\n<ul data-start=\"772\" data-end=\"972\">\n<li data-start=\"772\" data-end=\"833\">\n<p data-start=\"774\" data-end=\"833\">les modes longitudinaux ne se recouvrent plus correctement,<\/p>\n<\/li>\n<li data-start=\"836\" data-end=\"896\">\n<p data-start=\"838\" data-end=\"896\">le faisceau ne repasse pas dans le m\u00eame volume du cristal,<\/p>\n<\/li>\n<li data-start=\"899\" data-end=\"972\">\n<p data-start=\"901\" data-end=\"972\">le <strong data-start=\"904\" data-end=\"920\">mode-locking<\/strong> se casse \u2192 le laser retombe en r\u00e9gime continu (CW).<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3 data-start=\"974\" data-end=\"999\">\u27a4 Tol\u00e9rances typiques<\/h3>\n<ul data-start=\"1000\" data-end=\"1253\">\n<li data-start=\"1000\" data-end=\"1129\">\n<p data-start=\"1002\" data-end=\"1129\">Quelques <strong data-start=\"1011\" data-end=\"1026\">microm\u00e8tres<\/strong> de d\u00e9placement ou <strong data-start=\"1045\" data-end=\"1061\">milliradians<\/strong> d\u2019erreur angulaire suffisent \u00e0 d\u00e9truire le verrouillage de modes.<\/p>\n<\/li>\n<li data-start=\"1130\" data-end=\"1253\">\n<p data-start=\"1132\" data-end=\"1253\">Une variation de <strong data-start=\"1149\" data-end=\"1171\">longueur de cavit\u00e9<\/strong> de l\u2019ordre de <strong data-start=\"1186\" data-end=\"1214\">la longueur de coh\u00e9rence<\/strong> (~\u00b5m) perturbe le r\u00e9gime femtoseconde.<\/p>\n<\/li>\n<\/ul>\n<hr data-start=\"1255\" data-end=\"1258\" \/>\n<h2 data-start=\"1260\" data-end=\"1306\">\u26a1 2. Le SESAM : d\u00e9clencheur du mode-locking<\/h2>\n<p data-start=\"1307\" data-end=\"1367\">Le SESAM (n\u00b06 sur ta photo) est un <strong data-start=\"1342\" data-end=\"1365\">miroir non lin\u00e9aire<\/strong> :<\/p>\n<ul data-start=\"1368\" data-end=\"1582\">\n<li data-start=\"1368\" data-end=\"1436\">\n<p data-start=\"1370\" data-end=\"1436\">\u00e0 faible intensit\u00e9 \u2192 il r\u00e9fl\u00e9chit faiblement (pertes introduites),<\/p>\n<\/li>\n<li data-start=\"1437\" data-end=\"1582\">\n<p data-start=\"1439\" data-end=\"1582\">\u00e0 forte intensit\u00e9 \u2192 il devient transparent (saturation d\u2019absorption),<br \/>\nce qui favorise l\u2019auto-modulation du faisceau en impulsions tr\u00e8s courtes.<\/p>\n<\/li>\n<\/ul>\n<h3 data-start=\"1584\" data-end=\"1611\">\u27a4 Alignement sp\u00e9cifique<\/h3>\n<ul data-start=\"1612\" data-end=\"1969\">\n<li data-start=\"1612\" data-end=\"1969\">\n<p data-start=\"1614\" data-end=\"1709\">Le faisceau doit <strong data-start=\"1631\" data-end=\"1675\">frapper le SESAM exactement au bon point<\/strong> et avec la bonne <strong data-start=\"1693\" data-end=\"1707\">divergence<\/strong> :<\/p>\n<ul data-start=\"1712\" data-end=\"1969\">\n<li data-start=\"1712\" data-end=\"1817\">\n<p data-start=\"1714\" data-end=\"1817\">Si l\u2019incidence est trop d\u00e9centr\u00e9e \u2192 la r\u00e9flexion devient inhomog\u00e8ne \u2192 bruit ou absence de mode-locking.<\/p>\n<\/li>\n<li data-start=\"1820\" data-end=\"1969\">\n<p data-start=\"1822\" data-end=\"1969\">Si la taille du faisceau est trop grande\/petite \u2192 la <strong data-start=\"1875\" data-end=\"1898\">saturation du SESAM<\/strong> est inadapt\u00e9e (pas assez d\u2019intensit\u00e9 ou trop forte \u2192 dommage optique).<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3 data-start=\"1971\" data-end=\"1991\">\u27a4 Cons\u00e9quences :<\/h3>\n<ul data-start=\"1992\" data-end=\"2181\">\n<li data-start=\"1992\" data-end=\"2076\">\n<p data-start=\"1994\" data-end=\"2076\">Le <strong data-start=\"1997\" data-end=\"2023\">SESAM peut surchauffer<\/strong> ou \u00eatre endommag\u00e9 si l\u2019intensit\u00e9 est mal distribu\u00e9e.<\/p>\n<\/li>\n<li data-start=\"2077\" data-end=\"2181\">\n<p data-start=\"2079\" data-end=\"2181\">Un mauvais alignement emp\u00eache la <strong data-start=\"2112\" data-end=\"2155\">synchronisation des modes longitudinaux<\/strong> \u2192 pas d\u2019impulsion stable.<\/p>\n<\/li>\n<\/ul>\n<hr data-start=\"2183\" data-end=\"2186\" \/>\n<h2 data-start=\"2188\" data-end=\"2245\">\ud83e\udde0 3. Facteurs aggravants dans les lasers femtoseconde<\/h2>\n<ol data-start=\"2246\" data-end=\"2783\">\n<li data-start=\"2246\" data-end=\"2437\">\n<p data-start=\"2249\" data-end=\"2437\"><strong data-start=\"2249\" data-end=\"2263\">Dispersion<\/strong> :<br data-start=\"2265\" data-end=\"2268\" \/>Chaque lentille, miroir ou cristal ajoute de la dispersion \u2192 il faut compenser avec pr\u00e9cision la dispersion de groupe (GDD) pour \u00e9viter l\u2019\u00e9largissement d\u2019impulsion.<\/p>\n<\/li>\n<li data-start=\"2438\" data-end=\"2616\">\n<p data-start=\"2441\" data-end=\"2616\"><strong data-start=\"2441\" data-end=\"2483\">Alignement spatial et spectral coupl\u00e9s<\/strong> :<br data-start=\"2485\" data-end=\"2488\" \/>Le spectre large du faisceau implique qu\u2019une erreur d\u2019alignement modifie aussi la phase spectrale \u2192 d\u00e9grade la compression.<\/p>\n<\/li>\n<li data-start=\"2617\" data-end=\"2783\">\n<p data-start=\"2620\" data-end=\"2783\"><strong data-start=\"2620\" data-end=\"2653\">Effet Kerr (autofocalisation)<\/strong> :<br data-start=\"2655\" data-end=\"2658\" \/>Le faisceau modifie localement l\u2019indice du milieu \u2192 de petits d\u00e9salignements changent le r\u00e9gime optique (CW \u2194 mode-lock\u00e9).<\/p>\n<\/li>\n<\/ol>\n<hr data-start=\"2785\" data-end=\"2788\" \/>\n<h2 data-start=\"2790\" data-end=\"2807\">\ud83d\udd0d En r\u00e9sum\u00e9 :<\/h2>\n<div class=\"_tableContainer_1rjym_1\">\n<div class=\"group _tableWrapper_1rjym_13 flex w-fit flex-col-reverse\" tabindex=\"-1\">\n<table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"2808\" data-end=\"3238\">\n<thead data-start=\"2808\" data-end=\"2866\">\n<tr data-start=\"2808\" data-end=\"2866\">\n<th data-start=\"2808\" data-end=\"2818\" data-col-size=\"sm\">\u00c9l\u00e9ment<\/th>\n<th data-start=\"2818\" data-end=\"2832\" data-col-size=\"sm\">Sensibilit\u00e9<\/th>\n<th data-start=\"2832\" data-end=\"2866\" data-col-size=\"md\">Cons\u00e9quence d\u2019un d\u00e9salignement<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"2928\" data-end=\"3238\">\n<tr data-start=\"2928\" data-end=\"3000\">\n<td data-start=\"2928\" data-end=\"2945\" data-col-size=\"sm\">Cavit\u00e9 optique<\/td>\n<td data-start=\"2945\" data-end=\"2961\" data-col-size=\"sm\">Microm\u00e9trique<\/td>\n<td data-start=\"2961\" data-end=\"3000\" data-col-size=\"md\">Perte de r\u00e9sonance \/ de mode commun<\/td>\n<\/tr>\n<tr data-start=\"3001\" data-end=\"3078\">\n<td data-start=\"3001\" data-end=\"3009\" data-col-size=\"sm\">SESAM<\/td>\n<td data-start=\"3009\" data-end=\"3046\" data-col-size=\"sm\">Submillim\u00e9trique \/ micro-angulaire<\/td>\n<td data-start=\"3046\" data-end=\"3078\" data-col-size=\"md\">Pas de mode-lock ou dommages<\/td>\n<\/tr>\n<tr data-start=\"3079\" data-end=\"3172\">\n<td data-start=\"3079\" data-end=\"3092\" data-col-size=\"sm\">Dispersion<\/td>\n<td data-start=\"3092\" data-end=\"3120\" data-col-size=\"sm\">Picoseconde\u00b2 de tol\u00e9rance<\/td>\n<td data-start=\"3120\" data-end=\"3172\" data-col-size=\"md\">Impulsions \u00e9largies, perte de puissance de cr\u00eate<\/td>\n<\/tr>\n<tr data-start=\"3173\" data-end=\"3238\">\n<td data-start=\"3173\" data-end=\"3187\" data-col-size=\"sm\">Temp\u00e9rature<\/td>\n<td data-start=\"3187\" data-end=\"3201\" data-col-size=\"sm\">Quelques \u00b0C<\/td>\n<td data-start=\"3201\" data-end=\"3238\" data-col-size=\"md\">D\u00e9rive du point de fonctionnement<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div><\/section><\/div><div class=\"flex_column av_one_half  flex_column_div av-zero-column-padding first  avia-builder-el-20  el_after_av_one_full  el_before_av_one_half  column-top-margin\" style='border-radius:0px; '><div  class='avia-image-container  av-styling-    avia-builder-el-21  avia-builder-el-no-sibling  avia-align-center '  itemprop=\"image\" itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/ImageObject\"  ><div class='avia-image-container-inner'><div class='avia-image-overlay-wrap'><img decoding=\"async\" class='wp-image-3202 avia-img-lazy-loading-not-3202 avia_image' src=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/Capture-decran-2023-03-31-120804.jpg\" alt='' title='Capture d\u2019\u00e9cran 2023-03-31 120804' height=\"363\" width=\"545\"  itemprop=\"thumbnailUrl\" srcset=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/Capture-decran-2023-03-31-120804.jpg 545w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/Capture-decran-2023-03-31-120804-300x200.jpg 300w\" sizes=\"(max-width: 545px) 100vw, 545px\" \/><\/div><\/div><\/div><\/div><\/p>\n<div class=\"flex_column av_one_half  flex_column_div av-zero-column-padding   avia-builder-el-22  el_after_av_one_half  avia-builder-el-last  column-top-margin\" style='border-radius:0px; '><div  class='avia-image-container  av-styling-    avia-builder-el-23  avia-builder-el-no-sibling  avia-align-center '  itemprop=\"image\" itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/ImageObject\"  ><div class='avia-image-container-inner'><div class='avia-image-overlay-wrap'><img decoding=\"async\" class='wp-image-3203 avia-img-lazy-loading-not-3203 avia_image' src=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/P1020530m10.jpg\" alt='' title='P1020530m10' height=\"750\" width=\"1000\"  itemprop=\"thumbnailUrl\" srcset=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/P1020530m10.jpg 1000w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/P1020530m10-300x225.jpg 300w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/P1020530m10-768x576.jpg 768w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/12\/P1020530m10-705x529.jpg 705w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/div><\/div><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":1097,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-1096","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-lasers-a-solides"],"_links":{"self":[{"href":"https:\/\/www.swissrocketman.fr\/Wordpress\/index.php?rest_route=\/wp\/v2\/posts\/1096","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.swissrocketman.fr\/Wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.swissrocketman.fr\/Wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.swissrocketman.fr\/Wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.swissrocketman.fr\/Wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1096"}],"version-history":[{"count":10,"href":"https:\/\/www.swissrocketman.fr\/Wordpress\/index.php?rest_route=\/wp\/v2\/posts\/1096\/revisions"}],"predecessor-version":[{"id":3457,"href":"https:\/\/www.swissrocketman.fr\/Wordpress\/index.php?rest_route=\/wp\/v2\/posts\/1096\/revisions\/3457"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.swissrocketman.fr\/Wordpress\/index.php?rest_route=\/wp\/v2\/media\/1097"}],"wp:attachment":[{"href":"https:\/\/www.swissrocketman.fr\/Wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1096"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.swissrocketman.fr\/Wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1096"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.swissrocketman.fr\/Wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1096"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}