{"id":843,"date":"2022-11-10T10:48:29","date_gmt":"2022-11-10T09:48:29","guid":{"rendered":"http:\/\/s848664668.onlinehome.fr\/Wordpress\/?p=843"},"modified":"2025-12-21T16:07:39","modified_gmt":"2025-12-21T15:07:39","slug":"843","status":"publish","type":"post","link":"https:\/\/www.swissrocketman.fr\/Wordpress\/?p=843","title":{"rendered":"TETE LASER FEMTOSECOND COHERENT VPUF"},"content":{"rendered":"<div  style='padding-bottom:10px; ' class='av-special-heading av-special-heading-h1  blockquote classic-quote  avia-builder-el-0  el_before_av_one_full  avia-builder-el-first  '><h1 class='av-special-heading-tag '  itemprop=\"headline\"  >TETE LASER FEMTOSECOND COHERENT VPUF<\/h1><div class='special-heading-border'><div class='special-heading-inner-border' ><\/div><\/div><\/div>\n<div class=\"flex_column av_one_full  flex_column_div av-zero-column-padding first  avia-builder-el-1  el_after_av_heading  el_before_av_one_full  \" style='border-radius:0px; '><div  class='avia-video avia-video-16-9   av-lazyload-immediate  av-lazyload-video-embed  ' style='background-image:url(\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/20221025_105345-300x169.jpg\");'  itemprop=\"video\" itemtype=\"https:\/\/schema.org\/VideoObject\"  data-original_url='https:\/\/youtube.com\/shorts\/HsyEqIHHgTY' ><script type='text\/html' class='av-video-tmpl'><div class='avia-iframe-wrap'><iframe loading=\"lazy\" title=\"VPUF  laser femtoseconde COHERENT\" width=\"1500\" height=\"844\" src=\"https:\/\/www.youtube.com\/embed\/HsyEqIHHgTY?feature=oembed&autoplay=0&loop=0&controls=1&mute=0\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" allowfullscreen><\/iframe><\/div><\/script><div class='av-click-to-play-overlay'><div class=\"avia_playpause_icon\"><\/div><\/div><\/div><\/div>\n<div class=\"flex_column av_one_full  flex_column_div av-zero-column-padding first  avia-builder-el-3  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=\"0\" data-end=\"357\"><strong data-start=\"6\" data-end=\"14\">VPUF<\/strong> chez Coherent signifie <em data-start=\"38\" data-end=\"63\">Verdi-Pumped Ultra-Fast<\/em> : c\u2019est la t\u00eate ultrarapide Ti:saphir pomp\u00e9e par un laser Verdi (vert 532 nm) utilis\u00e9e dans les syst\u00e8mes <strong data-start=\"169\" data-end=\"180\">Vitesse<\/strong> (et d\u00e9riv\u00e9s). Je te r\u00e9sume les principales caract\u00e9ristiques techniques et comportementales qu\u2019on trouve dans les documents officiels \/ fiches techniques et manuels Coherent :<\/h3>\n<h3 data-start=\"359\" data-end=\"397\">Caract\u00e9ristiques cl\u00e9s (r\u00e9capitul\u00e9)<\/h3>\n<ul data-start=\"398\" data-end=\"1848\">\n<li data-start=\"398\" data-end=\"516\">\n<h3 data-start=\"400\" data-end=\"516\">Type : <strong data-start=\"407\" data-end=\"475\">Oscillateur Ti:saphir ultrafast (VPUF = Verdi-Pumped Ultra-Fast)<\/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.scribd.com\/document\/715537327\/Vitesse-Laser-Operator-s-Manual?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\">Scribd<\/span><\/span><\/span><\/a><\/span><\/span><\/h3>\n<\/li>\n<li data-start=\"517\" data-end=\"620\">\n<h3 data-start=\"519\" data-end=\"620\">Longueur d\u2019onde nominale : <strong data-start=\"546\" data-end=\"558\">\u2248 800 nm<\/strong> (mod\u00e8le Vitesse 800).<\/h3>\n<\/li>\n<li data-start=\"621\" data-end=\"760\">\n<h3 data-start=\"623\" data-end=\"760\">Dur\u00e9e d\u2019impulsion : <strong data-start=\"643\" data-end=\"655\">&lt; 100 fs<\/strong> (typiquement ~70\u2013100 fs selon l\u2019alignement et la configuration).<\/h3>\n<\/li>\n<li data-start=\"761\" data-end=\"867\">\n<h3 data-start=\"763\" data-end=\"867\">Fr\u00e9quence de r\u00e9p\u00e9tition : <strong data-start=\"789\" data-end=\"801\">\u2248 80 MHz<\/strong> (oscillateur mode-lock\u00e9).<\/h3>\n<\/li>\n<li data-start=\"868\" data-end=\"1029\">\n<h3 data-start=\"870\" data-end=\"1029\">Puissance moyenne : typ. <strong data-start=\"895\" data-end=\"912\">~0,75 W \u00e0 1 W<\/strong> (ex. Vitesse 800-5 \u2248 750 mW ; variantes jusqu\u2019\u00e0 \u22481 W selon version\/pompage).<\/h3>\n<\/li>\n<li data-start=\"1030\" data-end=\"1125\">\n<h3 data-start=\"1032\" data-end=\"1125\">Largeur spectrale : <strong data-start=\"1052\" data-end=\"1062\">&gt;10 nm<\/strong> (selon configuration). <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\/Solid-State-Lasers\/solid-state-and-fiber-lasers\/Femtosecond-Laser-800nm-750mW-Coherent?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\">laserlabsource.com<\/span><\/span><\/span><\/a><\/span><\/span><\/h3>\n<\/li>\n<li data-start=\"1126\" data-end=\"1289\">\n<h3 data-start=\"1128\" data-end=\"1289\">Qualit\u00e9 de faisceau : <strong data-start=\"1150\" data-end=\"1163\">M\u00b2 &lt; ~1.2<\/strong>, divergence ~1.1 mrad, diam\u00e8tre de faisceau \u00e0 la sortie \u2248 1.25\u20131.75 mm selon version.<\/h3>\n<\/li>\n<li data-start=\"1290\" data-end=\"1402\">\n<h3 data-start=\"1292\" data-end=\"1402\">Polarisation : forte (&gt;100:1), orientation horizontale (selon mod\u00e8le).<\/h3>\n<\/li>\n<li data-start=\"1403\" data-end=\"1547\">\n<h3 data-start=\"1405\" data-end=\"1547\">Stabilit\u00e9 &amp; bruit : <strong data-start=\"1425\" data-end=\"1456\">stabilit\u00e9 de puissance \u00b1~1%<\/strong>, bruit RMS &lt;~0.1% (plage indiqu\u00e9e dans les specs).<\/h3>\n<\/li>\n<li data-start=\"1548\" data-end=\"1675\">\n<h3 data-start=\"1550\" data-end=\"1675\">M\u00e9thode de modelocking : <strong data-start=\"1575\" data-end=\"1607\">Kerr-Lens Mode-Locking (KLM)<\/strong> avec d\u00e9marrage automatique. <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.scribd.com\/document\/715537327\/Vitesse-Laser-Operator-s-Manual?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\">Scribd<\/span><\/span><\/span><\/a><\/span><\/span><\/h3>\n<\/li>\n<li data-start=\"1676\" data-end=\"1848\">\n<h3 data-start=\"1678\" data-end=\"1848\">Pompe int\u00e9gr\u00e9e : <strong data-start=\"1695\" data-end=\"1719\">Verdi (DPSS) 532 nm)<\/strong> int\u00e9gr\u00e9 (ou associ\u00e9) pour pompage ; PowerTrack pour optimisation automatique du pompage.<\/h3>\n<\/li>\n<li data-start=\"1403\" data-end=\"1547\"><\/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-5  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><strong>T\u00eate laser femtosecond VPUF\u00a0 de COHERENT, pomp\u00e9 au moyen d&rsquo;un laser DPSS doubl\u00e9 en frequence \u00e0 mode longitudinal unique de 10W de sortie.<\/strong><\/h3>\n<h3 data-start=\"1687\" data-end=\"1998\">\u00ab The VPUF laser head uses Ti:sapphire as the gain medium. The proprietary Negative Dispersion Mirrors (NDM) provide the total negative dispersion compensation \u2026 Modelocking is obtained using the Kerr-Lens Mode-Locking (KLM) technique with an automatic starter. \u00bb\u00a0\u2003 \u2022 Puissance moyenne &gt; 200 mW (mod\u00e8le de base) ou &gt; 650 mW (mod\u00e8le 5 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.scribd.com\/document\/715537327\/Vitesse-Laser-Operator-s-Manual?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\">Scribd<\/span><\/span><\/span><\/a><\/span><\/span><br data-start=\"2197\" data-end=\"2200\" \/>\u2003 \u2022 Longueur d\u2019onde 800 \u00b1 1 nm <br data-start=\"2270\" data-end=\"2273\" \/>\u2003 \u2022 Dur\u00e9e d\u2019impulsion &lt; 100 fs (bas\u00e9e sur d\u00e9conv. sech\u00b2) <br data-start=\"2369\" data-end=\"2372\" \/>\u2003 \u2022 Stabilit\u00e9 de puissance \u00b11 % <br data-start=\"2443\" data-end=\"2446\" \/>\u2003 \u2022 Bruit &lt; 0,1 % RMS <br data-start=\"2509\" data-end=\"2512\" \/>\u2003 \u2022 Diam\u00e8tre du faisceau typique 1,25 mm (x) \u00b10,25 mm <br data-start=\"2607\" data-end=\"2610\" \/>\u2003 \u2022 Divergence &lt; 1,2 mrad (angle total) <br data-start=\"2691\" data-end=\"2694\" \/>\u2003 \u2022 M\u00b2 &lt; 1,1<\/h3>\n<\/div><\/section><\/div>\n<div class=\"flex_column av_one_full  flex_column_div av-zero-column-padding first  avia-builder-el-7  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-8  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-845 avia-img-lazy-loading-not-845 avia_image' src=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/20221025_105345-scaled.jpg\" alt='' title='20221025_105345' height=\"1440\" width=\"2560\"  itemprop=\"thumbnailUrl\" srcset=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/20221025_105345-scaled.jpg 2560w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/20221025_105345-300x169.jpg 300w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/20221025_105345-1030x579.jpg 1030w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/20221025_105345-768x432.jpg 768w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/20221025_105345-1536x864.jpg 1536w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/20221025_105345-2048x1152.jpg 2048w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/20221025_105345-1500x844.jpg 1500w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/20221025_105345-705x397.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-9  el_after_av_one_full  el_before_av_textblock  column-top-margin\" style='border-radius:0px; '><div  class='avia-image-container  av-styling-    avia-builder-el-10  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-846 avia-img-lazy-loading-not-846 avia_image' src=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/20221025_105432-scaled.jpg\" alt='' title='20221025_105432' height=\"1440\" width=\"2560\"  itemprop=\"thumbnailUrl\" srcset=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/20221025_105432-scaled.jpg 2560w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/20221025_105432-300x169.jpg 300w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/20221025_105432-1030x579.jpg 1030w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/20221025_105432-768x432.jpg 768w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/20221025_105432-1536x864.jpg 1536w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/20221025_105432-2048x1152.jpg 2048w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/20221025_105432-1500x844.jpg 1500w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/20221025_105432-705x397.jpg 705w\" sizes=\"(max-width: 2560px) 100vw, 2560px\" \/><\/div><\/div><\/div><\/div>\n<section class=\"av_textblock_section \"  itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock  '   itemprop=\"text\" ><h3>Infos op\u00e9rationnelles \/ m\u00e9caniques utiles<\/h3>\n<ul data-start=\"1896\" data-end=\"2431\">\n<li data-start=\"1896\" data-end=\"2069\">\n<h3 data-start=\"1898\" data-end=\"2069\">La t\u00eate VPUF utilise des <strong data-start=\"1923\" data-end=\"1963\">mirroirs \u00e0 dispersion n\u00e9gative (NDM)<\/strong> pour compenser la dispersion et obtenir des impulsions &lt;100 fs.<\/h3>\n<\/li>\n<li data-start=\"2070\" data-end=\"2290\">\n<h3 data-start=\"2072\" data-end=\"2290\">Temp\u00e9rature de service \/ refroidissement : la t\u00eate et le cristal Ti:saphir sont refroidis \u2014 le manuel recommande une consigne chiller (ex. 20 \u00b0C) pour une performance optimale.<\/h3>\n<\/li>\n<li data-start=\"2291\" data-end=\"2431\">\n<h3 data-start=\"2293\" data-end=\"2431\">Interfaces : contr\u00f4le via panneau \/ RS-232 \/ options pour int\u00e9gration OEM (d\u00e9pend de la variante)<\/h3>\n<\/li>\n<\/ul>\n<\/div><\/section>\n<div  class='avia-image-container  av-styling-    avia-builder-el-12  el_after_av_textblock  el_before_av_image  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-847 avia-img-lazy-loading-not-847 avia_image' src=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/20221025_110714-2-scaled.jpg\" alt='' title='20221025_110714 (2)' height=\"2560\" width=\"1537\"  itemprop=\"thumbnailUrl\" srcset=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/20221025_110714-2-scaled.jpg 1537w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/20221025_110714-2-180x300.jpg 180w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/20221025_110714-2-618x1030.jpg 618w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/20221025_110714-2-768x1279.jpg 768w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/20221025_110714-2-922x1536.jpg 922w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/20221025_110714-2-1230x2048.jpg 1230w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/20221025_110714-2-901x1500.jpg 901w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/20221025_110714-2-423x705.jpg 423w\" sizes=\"(max-width: 1537px) 100vw, 1537px\" \/><\/div><\/div><\/div>\n<div  class='avia-image-container  av-styling-    avia-builder-el-13  el_after_av_image  el_before_av_one_half  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-848 avia-img-lazy-loading-not-848 avia_image' src=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/20221025_110747-1-scaled.jpg\" alt='' title='20221025_110747' height=\"2560\" width=\"1440\"  itemprop=\"thumbnailUrl\" srcset=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/20221025_110747-1-scaled.jpg 1440w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/20221025_110747-1-169x300.jpg 169w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/20221025_110747-1-579x1030.jpg 579w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/20221025_110747-1-768x1365.jpg 768w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/20221025_110747-1-864x1536.jpg 864w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/20221025_110747-1-1152x2048.jpg 1152w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/20221025_110747-1-844x1500.jpg 844w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/20221025_110747-1-397x705.jpg 397w\" sizes=\"(max-width: 1440px) 100vw, 1440px\" \/><\/div><\/div><\/div>\n<div class=\"flex_column av_one_half  flex_column_div av-zero-column-padding first  avia-builder-el-14  el_after_av_image  el_before_av_one_half  \" style='border-radius:0px; '><p><div  class='avia-image-container  av-styling-    avia-builder-el-15  el_before_av_textblock  avia-builder-el-first  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-854 avia-img-lazy-loading-not-854 avia_image' src=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/Capture-decran-2022-10-18-141412.jpg\" alt='' title='Capture d\u2019\u00e9cran 2022-10-18 141412' height=\"387\" width=\"538\"  itemprop=\"thumbnailUrl\" srcset=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/Capture-decran-2022-10-18-141412.jpg 538w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/Capture-decran-2022-10-18-141412-300x216.jpg 300w\" sizes=\"(max-width: 538px) 100vw, 538px\" \/><\/div><\/div><\/div><br \/>\n<section class=\"av_textblock_section \"  itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock  '   itemprop=\"text\" ><p>Ce laser femto se compose d&rsquo;un barreau titane saphir de 7mmde diam\u00e8tre et 8mm de long avec les extr\u00e9mit\u00e9s taill\u00e9es \u00e0 l&rsquo;incidence de Brewster. Le pompage ce fait au moyen d&rsquo;un laser DPSS doubl\u00e9 en fr\u00e9quence 532nm qui est focalis\u00e9 dans le barreau Ti:Sa . Le r\u00e9sonnateur se compose de 2 miroirs concaves totalement r\u00e9flecteur, d&rsquo;un miroir de sortie fixe ayant un coeficient de transmission de 4% et d&rsquo;un miroir totalement r\u00e9flecteur R=99.95%. Ce miroir est mont\u00e9 sur un actuateur \u00e9lectromagn\u00e9tique permettant de passer du r\u00e9gine continu au r\u00e9gime impulsionelle en fesant bouger le miroir par une impulsion de courant dans la bobine (starter). La synchronisation des modes longitudinaux ( environ 5000) est r\u00e9alis\u00e9 dans le cristal Ti:Sa par effet KERR. Le cristal est maintenu \u00e0 22\u00b0C au moyen d&rsquo;une cellule de PELTIER\u00a0 (TEC).<\/p>\n<p>Se trouve de par et d&rsquo;autre du cristal Ti:Sa\u00a0 4 miroirs NDM qui cr\u00e9e une dispersion n\u00e9gative permettant de maintenir la vitesse de groupe pour que le pulse laser ne s&rsquo;\u00e9largisse pas durant les passages dans le cristal Ti:Sa.<\/p>\n<\/div><\/section><\/p><\/div>\n<div class=\"flex_column av_one_half  flex_column_div av-zero-column-padding   avia-builder-el-17  el_after_av_one_half  el_before_av_image  \" style='border-radius:0px; '><div  class='avia-image-container  av-styling-    avia-builder-el-18  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-855 avia-img-lazy-loading-not-855 avia_image' src=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/P1020101-rotated.jpg\" alt='' title='P1020101' height=\"2048\" width=\"1536\"  itemprop=\"thumbnailUrl\" srcset=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/P1020101-rotated.jpg 1536w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/P1020101-225x300.jpg 225w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/P1020101-773x1030.jpg 773w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/P1020101-768x1024.jpg 768w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/P1020101-1152x1536.jpg 1152w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/P1020101-1125x1500.jpg 1125w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/P1020101-529x705.jpg 529w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/><\/div><\/div><\/div><\/div>\n<div  class='avia-image-container  av-styling-    avia-builder-el-19  el_after_av_one_half  el_before_av_one_full  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-860 avia-img-lazy-loading-not-860 avia_image' src=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/P1020102.jpg\" alt='' title='P1020102' height=\"1536\" width=\"2048\"  itemprop=\"thumbnailUrl\" srcset=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/P1020102.jpg 2048w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/P1020102-300x225.jpg 300w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/P1020102-1030x773.jpg 1030w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/P1020102-768x576.jpg 768w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/P1020102-1536x1152.jpg 1536w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/P1020102-1500x1125.jpg 1500w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/P1020102-705x529.jpg 705w\" sizes=\"(max-width: 2048px) 100vw, 2048px\" \/><\/div><\/div><\/div>\n<div class=\"flex_column av_one_full  flex_column_div av-zero-column-padding first  avia-builder-el-20  el_after_av_image  el_before_av_one_full  \" style='border-radius:0px; '><section class=\"av_textblock_section \"  itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock  '   itemprop=\"text\" ><article class=\"text-token-text-primary w-full focus:outline-none scroll-mt-&#091;calc(var(--header-height)+min(200px,max(70px,20svh)))&#093;\" dir=\"auto\" tabindex=\"-1\" data-turn-id=\"b6597f1e-f058-4452-a480-75a16f241a57\" data-testid=\"conversation-turn-4\" data-scroll-anchor=\"false\" data-turn=\"assistant\">\n<div class=\"text-base my-auto mx-auto &#091;--thread-content-margin:--spacing(4)&#093; thread-sm:&#091;--thread-content-margin:--spacing(6)&#093; thread-lg:&#091;--thread-content-margin:--spacing(16)&#093; px-(--thread-content-margin)\">\n<div class=\"&#091;--thread-content-max-width:40rem&#093; thread-lg:&#091;--thread-content-max-width:48rem&#093; mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\" tabindex=\"-1\">\n<div class=\"flex max-w-full flex-col grow\">\n<div class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal &#091;.text-message+&amp;&#093;:mt-5\" dir=\"auto\" data-message-author-role=\"assistant\" data-message-id=\"9fa288f8-1c4e-479f-9a4e-7b338ee48d2b\" data-message-model-slug=\"gpt-5\">\n<div class=\"flex w-full flex-col gap-1 empty:hidden first:pt-&#091;1px&#093;\">\n<div class=\"markdown prose dark:prose-invert w-full break-words light markdown-new-styling\">\n<h3 data-start=\"759\" data-end=\"798\"><span style=\"color: #33cccc;\">2. Alignement CW (r\u00e9gime continu)<\/span><\/h3>\n<h3 data-start=\"799\" data-end=\"890\">L\u2019objectif : <strong data-start=\"812\" data-end=\"851\">obtenir un fonctionnement CW stable<\/strong> avant toute tentative de mode-locking.<\/h3>\n<ol data-start=\"892\" data-end=\"1823\">\n<li data-start=\"892\" data-end=\"1170\">\n<h3 data-start=\"895\" data-end=\"915\"><strong data-start=\"895\" data-end=\"913\">Chemin optique<\/strong><\/h3>\n<ul data-start=\"919\" data-end=\"1170\">\n<li data-start=\"919\" data-end=\"987\">\n<h3 data-start=\"921\" data-end=\"987\">Ajuste le trajet de la pompe vers le cristal : centrage du spot.<\/h3>\n<\/li>\n<li data-start=\"991\" data-end=\"1070\">\n<h3 data-start=\"993\" data-end=\"1070\">Maximiser la fluorescence \u2192 v\u00e9rifier que la pompe traverse bien le cristal.<\/h3>\n<\/li>\n<li data-start=\"1074\" data-end=\"1170\">\n<h3 data-start=\"1076\" data-end=\"1170\">Ajuste le faisceau laser (entre les miroirs de cavit\u00e9) pour qu\u2019il soit centr\u00e9 dans le cristal.<\/h3>\n<\/li>\n<\/ul>\n<\/li>\n<li data-start=\"1172\" data-end=\"1546\">\n<h3 data-start=\"1175\" data-end=\"1207\"><strong data-start=\"1175\" data-end=\"1205\">Mise en place de la cavit\u00e9<\/strong><\/h3>\n<ul data-start=\"1211\" data-end=\"1546\">\n<li data-start=\"1211\" data-end=\"1296\">\n<h3 data-start=\"1213\" data-end=\"1296\">Fermer la cavit\u00e9 avec les deux miroirs de courbure (R = 100 mm \u00e0 200 mm typique).<\/h3>\n<\/li>\n<li data-start=\"1300\" data-end=\"1381\">\n<h3 data-start=\"1302\" data-end=\"1381\">Ajuste la distance miroir\u2013cristal pour obtenir un spot stable sur le cristal.<\/h3>\n<\/li>\n<li data-start=\"1385\" data-end=\"1455\">\n<h3 data-start=\"1387\" data-end=\"1455\">V\u00e9rifie le spot sur l\u2019extr\u00e9mit\u00e9 de sortie (miroir output coupler).<\/h3>\n<\/li>\n<li data-start=\"1459\" data-end=\"1546\">\n<h3 data-start=\"1461\" data-end=\"1546\">Installe un d\u00e9tecteur de puissance derri\u00e8re un miroir partiellement transparent (OC).<\/h3>\n<\/li>\n<\/ul>\n<\/li>\n<li data-start=\"1548\" data-end=\"1823\">\n<h3 data-start=\"1551\" data-end=\"1580\"><strong data-start=\"1551\" data-end=\"1578\">Lancer l\u2019\u00e9mission laser<\/strong><\/h3>\n<ul data-start=\"1584\" data-end=\"1823\">\n<li data-start=\"1584\" data-end=\"1635\">\n<h3 data-start=\"1586\" data-end=\"1635\">Augmente progressivement la puissance de pompe.<\/h3>\n<\/li>\n<li data-start=\"1639\" data-end=\"1717\">\n<h3 data-start=\"1641\" data-end=\"1717\">Observe l\u2019\u00e9mission CW (visible parfois rouge\u00e2tre \u00e0 cause de fluorescence).<\/h3>\n<\/li>\n<li data-start=\"1721\" data-end=\"1823\">\n<h3 data-start=\"1723\" data-end=\"1823\">Optimise l\u2019alignement jusqu\u2019\u00e0 obtenir la <strong data-start=\"1764\" data-end=\"1789\">puissance CW maximale<\/strong> et un faisceau propre (gaussien).<\/h3>\n<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<h3 data-start=\"1830\" data-end=\"1884\"><span style=\"color: #33cccc;\">3. Pr\u00e9paration pour KLM (Kerr-Lens Mode-Locking)<\/span><\/h3>\n<h3 data-start=\"1885\" data-end=\"1964\">Objectif : cr\u00e9er une <strong data-start=\"1906\" data-end=\"1934\">discrimination de pertes<\/strong> entre CW et impulsion courte.<\/h3>\n<h3 data-start=\"1966\" data-end=\"1992\">a) G\u00e9om\u00e9trie de cavit\u00e9<\/h3>\n<ul data-start=\"1993\" data-end=\"2328\">\n<li data-start=\"1993\" data-end=\"2105\">\n<h3 data-start=\"1995\" data-end=\"2105\">Place la cavit\u00e9 <strong data-start=\"2011\" data-end=\"2045\">pr\u00e8s de la limite de stabilit\u00e9<\/strong> (en g\u00e9n\u00e9ral, l\u00e9g\u00e8rement \u00e0 l\u2019int\u00e9rieur de la zone stable).<\/h3>\n<\/li>\n<li data-start=\"2106\" data-end=\"2225\">\n<h3 data-start=\"2108\" data-end=\"2225\">Distance miroir\u2013miroir ajust\u00e9e pour que le faisceau soit <strong data-start=\"2165\" data-end=\"2209\">tr\u00e8s sensible \u00e0 la puissance intracavit\u00e9<\/strong> (effet Kerr).<\/h3>\n<\/li>\n<li data-start=\"2226\" data-end=\"2328\">\n<h3 data-start=\"2228\" data-end=\"2328\">Si c\u2019est un design en \u00ab X \u00bb ou \u00ab Z \u00bb, ajuste la jambe courte pour un spot minimal dans le cristal.<\/h3>\n<\/li>\n<\/ul>\n<h3 data-start=\"2330\" data-end=\"2345\">b) Aperture<\/h3>\n<ul data-start=\"2346\" data-end=\"2642\">\n<li data-start=\"2346\" data-end=\"2450\">\n<h3 data-start=\"2348\" data-end=\"2450\"><strong data-start=\"2348\" data-end=\"2365\">Soft aperture<\/strong> : faisceau de pompe l\u00e9g\u00e8rement plus petit que le mode laser (favorise les pulses).<\/h3>\n<\/li>\n<li data-start=\"2451\" data-end=\"2642\">\n<h3 data-start=\"2453\" data-end=\"2642\"><strong data-start=\"2453\" data-end=\"2470\">Hard aperture<\/strong> : petit iris proche du miroir de sortie, pour couper les modes larges (CW).<br data-start=\"2546\" data-end=\"2549\" \/>\u2192 Ajuste progressivement l\u2019ouverture jusqu\u2019\u00e0 ce que le CW soit stable mais proche du seuil.<\/h3>\n<\/li>\n<\/ul>\n<h3 data-start=\"2644\" data-end=\"2661\">c) Dispersion<\/h3>\n<ul data-start=\"2662\" data-end=\"2863\">\n<li data-start=\"2662\" data-end=\"2774\">\n<h3 data-start=\"2664\" data-end=\"2774\">Prismes ou miroirs chirp\u00e9s : ajust\u00e9s pour <strong data-start=\"2706\" data-end=\"2751\">GDD n\u00e9gative totale \u2248 \u2212100 fs\u00b2 \u00e0 \u2212300 fs\u00b2<\/strong> (selon dur\u00e9e vis\u00e9e).<\/h3>\n<\/li>\n<li data-start=\"2775\" data-end=\"2863\">\n<h3 data-start=\"2777\" data-end=\"2863\">V\u00e9rifie que le faisceau passe correctement \u00e0 travers les prismes sans perte excessive.<\/h3>\n<\/li>\n<\/ul>\n<h3 data-start=\"2870\" data-end=\"2903\"><span style=\"color: #33cccc;\">4. D\u00e9marrage du mode-locking<\/span><\/h3>\n<h3>L\u2019objectif : <strong data-start=\"2917\" data-end=\"2953\">faire appara\u00eetre le r\u00e9gime puls\u00e9<\/strong>.<\/h3>\n<ol data-start=\"2956\" data-end=\"3563\">\n<li data-start=\"2956\" data-end=\"3013\">\n<h3><strong data-start=\"2959\" data-end=\"2991\">Augmenter lentement la pompe<\/strong> au-dessus du seuil.<\/h3>\n<\/li>\n<li data-start=\"3014\" data-end=\"3106\">\n<h3>Si self-starting :<\/h3>\n<ul data-start=\"3039\" data-end=\"3106\">\n<li data-start=\"3039\" data-end=\"3106\">\n<h3>Attendre quelques secondes\/minutes pour que le bruit d\u00e9clenche.<\/h3>\n<\/li>\n<\/ul>\n<\/li>\n<li data-start=\"3107\" data-end=\"3360\">\n<h3>Sinon, petites <strong data-start=\"3125\" data-end=\"3153\">perturbations m\u00e9caniques<\/strong> :<\/h3>\n<ul data-start=\"3159\" data-end=\"3360\">\n<li data-start=\"3159\" data-end=\"3222\">\n<h3>Tapote l\u00e9g\u00e8rement un miroir de courbure (pas le cristal !).<\/h3>\n<\/li>\n<li data-start=\"3226\" data-end=\"3319\">\n<h3>Balaye la distance cavit\u00e9 (miroir de translation fine) de \u00b1100 \u00b5m autour du point stable.<\/h3>\n<\/li>\n<li data-start=\"3323\" data-end=\"3360\">\n<h3>Ajuste l\u2019iris (si hard aperture).<\/h3>\n<\/li>\n<\/ul>\n<\/li>\n<li data-start=\"3361\" data-end=\"3563\">\n<h3>Surveille le signal de sortie :<\/h3>\n<ul data-start=\"3399\" data-end=\"3563\">\n<li data-start=\"3399\" data-end=\"3446\">\n<h3>Augmentation nette de la puissance optique.<\/h3>\n<\/li>\n<li data-start=\"3450\" data-end=\"3494\">\n<h3>\u00c9largissement spectral sur spectrom\u00e8tre.<\/h3>\n<\/li>\n<li data-start=\"3498\" data-end=\"3563\">\n<h3>Train d\u2019impulsions stable sur photodiode rapide (oscilloscope).<\/h3>\n<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<h3><span style=\"color: #33cccc;\">5. Optimisation du mode verrouill\u00e9<\/span><\/h3>\n<ol data-start=\"3611\" data-end=\"3990\">\n<li data-start=\"3611\" data-end=\"3694\">\n<h3><strong data-start=\"3614\" data-end=\"3625\">Spectre<\/strong> : mesurer sur spectrom\u00e8tre \u2192 bande large \u2192 coh\u00e9rent avec dur\u00e9e fs.<\/h3>\n<\/li>\n<li data-start=\"3695\" data-end=\"3771\">\n<h3><strong data-start=\"3698\" data-end=\"3707\">Dur\u00e9e<\/strong> : autocorr\u00e9lateur \u2192 typiquement 100 fs \u00e0 300 fs selon design.<\/h3>\n<\/li>\n<li data-start=\"3772\" data-end=\"3855\">\n<h3><strong data-start=\"3775\" data-end=\"3796\">Puissance moyenne<\/strong> : augmenter doucement la pompe pour am\u00e9liorer stabilit\u00e9.<\/h3>\n<\/li>\n<li data-start=\"3856\" data-end=\"3990\">\n<h3><strong data-start=\"3859\" data-end=\"3883\">Stabilit\u00e9 long terme<\/strong> :<\/h3>\n<ul data-start=\"3889\" data-end=\"3990\">\n<li data-start=\"3889\" data-end=\"3952\">\n<h3>Contr\u00f4ler temp\u00e9rature du cristal et m\u00e9canique de la cavit\u00e9.<\/h3>\n<\/li>\n<li data-start=\"3956\" data-end=\"3990\">\n<h3>\u00c9viter vibrations et flux d\u2019air.<\/h3>\n<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<h3><span style=\"color: #33cccc;\">6. Astuces pratiques sp\u00e9cifiques \u00e0 Yb;Nd<\/span><\/h3>\n<table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"4044\" data-end=\"4606\">\n<thead data-start=\"4044\" data-end=\"4105\">\n<tr data-start=\"4044\" data-end=\"4105\">\n<th data-start=\"4044\" data-end=\"4056\" data-col-size=\"sm\">Param\u00e8tre<\/th>\n<th data-start=\"4056\" data-end=\"4074\" data-col-size=\"sm\">Yb:KYW \/ Yb:KGW<\/th>\n<th data-start=\"4074\" data-end=\"4083\" data-col-size=\"sm\">Yb:YAG<\/th>\n<th data-start=\"4083\" data-end=\"4105\" data-col-size=\"sm\">Nd:glass \/ Nd:YVO\u2084<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"4168\" data-end=\"4606\">\n<tr data-start=\"4168\" data-end=\"4229\">\n<td data-start=\"4168\" data-end=\"4187\" data-col-size=\"sm\">Long. onde laser<\/td>\n<td data-start=\"4187\" data-end=\"4203\" data-col-size=\"sm\">~1030\u20131040 nm<\/td>\n<td data-start=\"4203\" data-end=\"4213\" data-col-size=\"sm\">1030 nm<\/td>\n<td data-start=\"4213\" data-end=\"4229\" data-col-size=\"sm\">1064\u20131340 nm<\/td>\n<\/tr>\n<tr data-start=\"4230\" data-end=\"4334\">\n<td data-start=\"4230\" data-end=\"4255\" data-col-size=\"sm\">Dispersion \u00e0 compenser<\/td>\n<td data-start=\"4255\" data-end=\"4287\" data-col-size=\"sm\">Moyenne (GDD \u2212100 \u00e0 \u2212300 fs\u00b2)<\/td>\n<td data-start=\"4287\" data-end=\"4316\" data-col-size=\"sm\">Importante (\u00e9pais cristal)<\/td>\n<td data-start=\"4316\" data-end=\"4334\" data-col-size=\"sm\">Faible-moyenne<\/td>\n<\/tr>\n<tr data-start=\"4335\" data-end=\"4400\">\n<td data-start=\"4335\" data-end=\"4351\" data-col-size=\"sm\">Pompe typique<\/td>\n<td data-start=\"4351\" data-end=\"4371\" data-col-size=\"sm\">980 nm diode (CW)<\/td>\n<td data-start=\"4371\" data-end=\"4390\" data-col-size=\"sm\">940 nm ou 969 nm<\/td>\n<td data-start=\"4390\" data-end=\"4400\" data-col-size=\"sm\">808 nm<\/td>\n<\/tr>\n<tr data-start=\"4401\" data-end=\"4482\">\n<td data-start=\"4401\" data-end=\"4419\" data-col-size=\"sm\">Facilit\u00e9 de KLM<\/td>\n<td data-start=\"4419\" data-end=\"4447\" data-col-size=\"sm\">Moyenne \u00e0 bonne (fort \u03c7\u00b3)<\/td>\n<td data-start=\"4447\" data-end=\"4471\" data-col-size=\"sm\">Difficile (\u03c7\u00b3 faible)<\/td>\n<td data-start=\"4471\" data-end=\"4482\" data-col-size=\"sm\">Moyenne<\/td>\n<\/tr>\n<tr data-start=\"4483\" data-end=\"4606\">\n<td data-start=\"4483\" data-end=\"4500\" data-col-size=\"sm\">D\u00e9marrage auto<\/td>\n<td data-start=\"4500\" data-end=\"4542\" data-col-size=\"sm\">Possible avec soft aperture bien r\u00e9gl\u00e9e<\/td>\n<td data-start=\"4542\" data-end=\"4569\" data-col-size=\"sm\">Souvent non, SESAM utile<\/td>\n<td data-start=\"4569\" data-end=\"4606\" data-col-size=\"sm\">Rare, souvent besoin d\u2019assistance<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><span style=\"color: #33cccc;\">7. Diagnostic en cas d\u2019\u00e9chec<\/span><\/h3>\n<table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"4648\" data-end=\"5144\">\n<thead data-start=\"4648\" data-end=\"4686\">\n<tr data-start=\"4648\" data-end=\"4686\">\n<th data-start=\"4648\" data-end=\"4659\" data-col-size=\"sm\">Sympt\u00f4me<\/th>\n<th data-start=\"4659\" data-end=\"4676\" data-col-size=\"sm\">Cause probable<\/th>\n<th data-start=\"4676\" data-end=\"4686\" data-col-size=\"md\">Action<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"4726\" data-end=\"5144\">\n<tr data-start=\"4726\" data-end=\"4821\">\n<td data-start=\"4726\" data-end=\"4744\" data-col-size=\"sm\">Pas de laser CW<\/td>\n<td data-start=\"4744\" data-end=\"4784\" data-col-size=\"sm\">Mauvais alignement \/ gain insuffisant<\/td>\n<td data-start=\"4784\" data-end=\"4821\" data-col-size=\"md\">R\u00e9aligner cavit\u00e9, augmenter pompe<\/td>\n<\/tr>\n<tr data-start=\"4822\" data-end=\"4940\">\n<td data-start=\"4822\" data-end=\"4843\" data-col-size=\"sm\">CW mais pas de KLM<\/td>\n<td data-start=\"4843\" data-end=\"4884\" data-col-size=\"sm\">Mauvaise position cavit\u00e9 (trop stable)<\/td>\n<td data-start=\"4884\" data-end=\"4940\" data-col-size=\"md\">D\u00e9placer l\u00e9g\u00e8rement un miroir vers bord de stabilit\u00e9<\/td>\n<\/tr>\n<tr data-start=\"4941\" data-end=\"5040\">\n<td data-start=\"4941\" data-end=\"4969\" data-col-size=\"sm\">ML instable \/ Q-switching<\/td>\n<td data-start=\"4969\" data-end=\"5003\" data-col-size=\"sm\">Gain trop \u00e9lev\u00e9, GDD incorrecte<\/td>\n<td data-start=\"5003\" data-end=\"5040\" data-col-size=\"md\">R\u00e9duire pompe, ajuster dispersion<\/td>\n<\/tr>\n<tr data-start=\"5041\" data-end=\"5144\">\n<td data-start=\"5041\" data-end=\"5064\" data-col-size=\"sm\">Pulses disparaissent<\/td>\n<td data-start=\"5064\" data-end=\"5094\" data-col-size=\"sm\">Cavit\u00e9 d\u00e9r\u00e9gl\u00e9e, vibrations<\/td>\n<td data-start=\"5094\" data-end=\"5144\" data-col-size=\"md\">Stabiliser m\u00e9caniquement, v\u00e9rifier temp\u00e9rature<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr data-start=\"5146\" data-end=\"5149\" \/>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/article>\n<article class=\"text-token-text-primary w-full focus:outline-none scroll-mt-(--header-height)\" dir=\"auto\" tabindex=\"-1\" data-turn-id=\"8ed5b5a0-71c5-47b7-9b7c-42310d26c9cc\" data-testid=\"conversation-turn-5\" data-scroll-anchor=\"false\" data-turn=\"user\">\n<h5 class=\"sr-only\"><\/h5>\n<div class=\"text-base my-auto mx-auto pt-12 &#091;--thread-content-margin:--spacing(4)&#093; thread-sm:&#091;--thread-content-margin:--spacing(6)&#093; thread-lg:&#091;--thread-content-margin:--spacing(16)&#093; px-(--thread-content-margin)\">\n<div class=\"&#091;--thread-content-max-width:40rem&#093; thread-lg:&#091;--thread-content-max-width:48rem&#093; mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col\" tabindex=\"-1\">\n<div class=\"flex max-w-full flex-col grow\">\n<div class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal &#091;.text-message+&amp;&#093;:mt-5\" dir=\"auto\" data-message-author-role=\"user\" data-message-id=\"8ed5b5a0-71c5-47b7-9b7c-42310d26c9cc\">\n<div class=\"flex w-full flex-col gap-1 empty:hidden items-end rtl:items-start\">\n<div class=\"user-message-bubble-color relative rounded-&#091;18px&#093; px-4 py-1.5 data-&#091;multiline&#093;:py-3 max-w-&#091;var(--user-chat-width,70%)&#093;\" data-multiline=\"\">\n<h3 class=\"whitespace-pre-wrap\">t\u00eate laser VPUF avec un Ti;saphir la source pompe un laser DPSS doub\u00e9 en fr\u00e9quence TEM00 et monomode longitudinal 5W de sortie CW. D\u00e9chlenchement par un mirior mont\u00e9 sur une bobine type \u00ab\u00a0voice coil \u00ab\u00a0<\/h3>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/article>\n<article class=\"text-token-text-primary w-full focus:outline-none scroll-mt-&#091;calc(var(--header-height)+min(200px,max(70px,20svh)))&#093;\" dir=\"auto\" tabindex=\"-1\" data-turn-id=\"b9275abb-a2f0-4a12-8cdc-b1aca28a1e86\" data-testid=\"conversation-turn-6\" data-scroll-anchor=\"true\" data-turn=\"assistant\">\n<div class=\"text-base my-auto mx-auto pb-10 &#091;--thread-content-margin:--spacing(4)&#093; thread-sm:&#091;--thread-content-margin:--spacing(6)&#093; thread-lg:&#091;--thread-content-margin:--spacing(16)&#093; px-(--thread-content-margin)\">\n<div class=\"&#091;--thread-content-max-width:40rem&#093; thread-lg:&#091;--thread-content-max-width:48rem&#093; mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\" tabindex=\"-1\">\n<div class=\"flex max-w-full flex-col grow\">\n<div class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal &#091;.text-message+&amp;&#093;:mt-5\" dir=\"auto\" data-message-author-role=\"assistant\" data-message-id=\"40af66af-8a2d-4563-9170-654ca84ea4f8\" data-message-model-slug=\"gpt-5-t-mini\">\n<div class=\"flex w-full flex-col gap-1 empty:hidden first:pt-&#091;1px&#093;\">\n<div class=\"markdown prose dark:prose-invert w-full break-words light markdown-new-styling\">\n<h3 data-start=\"0\" data-end=\"388\"><strong data-start=\"22\" data-end=\"72\">checklist d\u2019alignement enti\u00e8rement adapt\u00e9e<\/strong> \u00e0 ta t\u00eate VPUF avec <strong data-start=\"93\" data-end=\"106\">Ti:saphir<\/strong>, pompage par un <strong data-start=\"123\" data-end=\"169\">DPSS doubl\u00e9 (532 nm) TEM\u2080\u2080 monomode 5 W CW<\/strong>, et <strong data-start=\"174\" data-end=\"240\">d\u00e9clenchement m\u00e9canique via miroir mont\u00e9 sur bobine voice-coil<\/strong>. Je fournis des <strong data-start=\"257\" data-end=\"289\">valeurs de d\u00e9part num\u00e9riques<\/strong>, proc\u00e9dures pas-\u00e0-pas, r\u00e9glages du voice-coil pour \u00ab tap \u00bb \u00e9lectronique et diagnostics \u00e0 v\u00e9rifier.<\/h3>\n<h2 data-start=\"395\" data-end=\"447\"><span style=\"color: #ff6600;\">R\u00e9sum\u00e9 des param\u00e8tres de d\u00e9part (valeurs typiques)<\/span><\/h2>\n<ul data-start=\"448\" data-end=\"1193\">\n<li data-start=\"448\" data-end=\"503\">\n<h3 data-start=\"450\" data-end=\"503\">Longueur d\u2019onde Ti:saphir : ~800 nm (selon dopage).<\/h3>\n<\/li>\n<li data-start=\"504\" data-end=\"538\">\n<h3 data-start=\"506\" data-end=\"538\">Pompe : 532 nm, TEM\u2080\u2080, 5 W CW.<\/h3>\n<\/li>\n<li data-start=\"539\" data-end=\"610\">\n<h3 data-start=\"541\" data-end=\"610\">Cristal Ti:saphir (ex. 3\u20135 mm \u00e9paisseur) mont\u00e9 sur refroidissement.<\/h3>\n<\/li>\n<li data-start=\"611\" data-end=\"720\">\n<h3 data-start=\"613\" data-end=\"720\">Miroirs de courbure (ROC) : 100\u2013200 mm pour miroirs focaux (legs courts), miroirs plans\/plat pour autres.<\/h3>\n<\/li>\n<li data-start=\"721\" data-end=\"803\">\n<h3 data-start=\"723\" data-end=\"803\">Output coupler (OC) : T \u2248 1\u20133 % (commencer 1.5\u20132 % pour KLM avec forte pompe).<\/h3>\n<\/li>\n<li data-start=\"804\" data-end=\"864\">\n<h3 data-start=\"806\" data-end=\"864\">Waist pump inside crystal (pump spot) : 25\u201345 \u03bcm (1\/e\u00b2).<\/h3>\n<\/li>\n<li data-start=\"865\" data-end=\"978\">\n<h3 data-start=\"867\" data-end=\"978\">Waist laser mode inside cristal (laser mode) : 15\u201335 \u03bcm (viser pump spot \u2272 laser waist pour <em data-start=\"959\" data-end=\"974\">soft aperture<\/em>).<\/h3>\n<\/li>\n<li data-start=\"979\" data-end=\"1097\">\n<h3 data-start=\"981\" data-end=\"1097\">Dispersion initiale cible (GDD total par tour) : \u2248 \u2212100 fs\u00b2 \u00e0 \u2212250 fs\u00b2 (ajuster selon la bande spectrale mesur\u00e9e).<\/h3>\n<\/li>\n<li data-start=\"1098\" data-end=\"1193\">\n<h3 data-start=\"1100\" data-end=\"1193\">R\u00e9glage voice-coil pour d\u00e9clenchement : d\u00e9placement typique 0.5\u20135 \u03bcm (voir d\u00e9tails plus bas).<\/h3>\n<\/li>\n<\/ul>\n<h3 data-start=\"1200\" data-end=\"1234\"><span style=\"color: #33cccc;\">Outils et diagnostics \u00e0 pr\u00e9parer<\/span><\/h3>\n<ul data-start=\"1235\" data-end=\"1748\">\n<li data-start=\"1235\" data-end=\"1292\">\n<h3 data-start=\"1237\" data-end=\"1292\">Lunettes laser adapt\u00e9es (532 nm + 800 nm IR), \u00e9crans.<\/h3>\n<\/li>\n<li data-start=\"1293\" data-end=\"1342\">\n<h3 data-start=\"1295\" data-end=\"1342\">D\u00e9tecteur de puissance (calibr\u00e9), powermeter.<\/h3>\n<\/li>\n<li data-start=\"1343\" data-end=\"1394\">\n<h3 data-start=\"1345\" data-end=\"1394\">Spectrom\u00e8tre IR (\u2265 800 nm) ou moniteur spectre.<\/h3>\n<\/li>\n<li data-start=\"1395\" data-end=\"1469\">\n<h3 data-start=\"1397\" data-end=\"1469\">Photodiode rapide (&gt; 500 MHz) + oscilloscope (pour train d\u2019impulsion).<\/h3>\n<\/li>\n<li data-start=\"1470\" data-end=\"1533\">\n<h3 data-start=\"1472\" data-end=\"1533\">Autocorr\u00e9lateur (intensit\u00e9) pour mesurer dur\u00e9e d\u2019impulsion.<\/h3>\n<\/li>\n<li data-start=\"1534\" data-end=\"1611\">\n<h3 data-start=\"1536\" data-end=\"1611\">Cam\u00e9ra\/visualiseur IR \/ papier photoluminescent pour centrer le faisceau.<\/h3>\n<\/li>\n<li data-start=\"1612\" data-end=\"1685\">\n<h3 data-start=\"1614\" data-end=\"1685\">Profilom\u00e8tre \/ cam\u00e9ra pour v\u00e9rifier la forme du faisceau (optionnel).<\/h3>\n<\/li>\n<li data-start=\"1686\" data-end=\"1748\">\n<h3 data-start=\"1688\" data-end=\"1748\">Cl\u00e9s microm\u00e9triques, supports stables, isolateur vibratoire.<\/h3>\n<\/li>\n<\/ul>\n<h3 data-start=\"1755\" data-end=\"1803\"><span style=\"color: #33cccc;\">Check-list d\u2019alignement \u2013 ordre des op\u00e9rations<\/span><\/h3>\n<h2 data-start=\"1805\" data-end=\"1834\">1) S\u00e9curit\u00e9 et pr\u00e9paration<\/h2>\n<ol data-start=\"1835\" data-end=\"2049\">\n<li data-start=\"1835\" data-end=\"1889\">\n<h3 data-start=\"1838\" data-end=\"1889\">Arr\u00eate la pompe. V\u00e9rifie lunettes et protections.<\/h3>\n<\/li>\n<li data-start=\"1890\" data-end=\"1975\">\n<h3 data-start=\"1893\" data-end=\"1975\">Nettoie optiques visibles et v\u00e9rifie couples de fixation (pas de jeu m\u00e9canique).<\/h3>\n<\/li>\n<li data-start=\"1976\" data-end=\"2049\">\n<h3 data-start=\"1979\" data-end=\"2049\">Assure-toi du refroidissement du cristal et de la stabilit\u00e9 thermique.<\/h3>\n<\/li>\n<\/ol>\n<h2 data-start=\"2051\" data-end=\"2093\">2) Alignement du pompage sur le cristal<\/h2>\n<ol data-start=\"2094\" data-end=\"2419\">\n<li data-start=\"2094\" data-end=\"2211\">\n<h3 data-start=\"2097\" data-end=\"2211\">Mets la pompe \u00e0 tr\u00e8s faible puissance. Centre le faisceau 532 nm sur le cristal (utilise fluorescence ou \u00e9cran).<\/h3>\n<\/li>\n<li data-start=\"2212\" data-end=\"2325\">\n<h3 data-start=\"2215\" data-end=\"2325\">Ajuste les optiques de focalisation du pump pour obtenir un spot \u2248 25\u201345 \u03bcm (mesure avec cam\u00e9ra ou imageur).<\/h3>\n<\/li>\n<li data-start=\"2326\" data-end=\"2419\">\n<h3 data-start=\"2329\" data-end=\"2419\">V\u00e9rifie que l\u2019axe du pump co\u00efncide avec l\u2019axe de la cavit\u00e9 (au moins &lt; 50 \u03bcm de d\u00e9calage).<\/h3>\n<\/li>\n<\/ol>\n<h2 data-start=\"2421\" data-end=\"2464\">3) Mise en route CW et alignement cavit\u00e9<\/h2>\n<ol data-start=\"2465\" data-end=\"2825\">\n<li data-start=\"2465\" data-end=\"2562\">\n<h3 data-start=\"2468\" data-end=\"2562\">Place un output coupler de d\u00e9part T \u2248 3 % pour tester CW (plus \u00e9lev\u00e9 facilite d\u00e9marrage CW).<\/h3>\n<\/li>\n<li data-start=\"2563\" data-end=\"2713\">\n<h3 data-start=\"2566\" data-end=\"2713\">Aligne miroirs de cavit\u00e9 pour obtenir oscillation CW \u00e0 basse puissance de pompe ; maximise la puissance de sortie en ajustant translations\/tilts.<\/h3>\n<\/li>\n<li data-start=\"2714\" data-end=\"2825\">\n<h3 data-start=\"2717\" data-end=\"2825\">V\u00e9rifie la qualit\u00e9 du faisceau (gaussien) et la stabilit\u00e9 en puissance. Note la puissance CW \u00e0 5 W de pompe.<\/h3>\n<\/li>\n<\/ol>\n<h2 data-start=\"2827\" data-end=\"2896\">4) Mise en condition pour KLM (pr\u00e9parer la discrimination de mode)<\/h2>\n<ol data-start=\"2897\" data-end=\"3537\">\n<li data-start=\"2897\" data-end=\"2981\">\n<h3 data-start=\"2900\" data-end=\"2981\">Change OC pour T \u2248 1.5\u20132 % (si tu cherches pulses courts et intracavity \u00e9lev\u00e9).<\/h3>\n<\/li>\n<li data-start=\"2982\" data-end=\"3323\">\n<h3 data-start=\"2985\" data-end=\"3035\">Ajuste la cavit\u00e9 <strong data-start=\"3002\" data-end=\"3031\">pr\u00e8s du bord de stabilit\u00e9<\/strong> :<\/h3>\n<ul data-start=\"3039\" data-end=\"3323\">\n<li data-start=\"3039\" data-end=\"3171\">\n<h3 data-start=\"3041\" data-end=\"3171\">d\u00e9place l\u00e9g\u00e8rement (quelques 10\u2013200 \u03bcm) un miroir de courbure pour augmenter la sensibilit\u00e9 du waist intracavit\u00e9 \u00e0 la puissance.<\/h3>\n<\/li>\n<li data-start=\"3175\" data-end=\"3323\">\n<h3 data-start=\"3177\" data-end=\"3323\">Objectif : la taille du mode devienne fortement d\u00e9pendante de la puissance intracavit\u00e9 (grossi\u00e8rement, \u00eatre l\u00e9g\u00e8rement <em data-start=\"3296\" data-end=\"3304\">inside<\/em> la zone stable).<\/h3>\n<\/li>\n<\/ul>\n<\/li>\n<li data-start=\"3324\" data-end=\"3537\">\n<h3 data-start=\"3327\" data-end=\"3537\">Positionne un <strong data-start=\"3341\" data-end=\"3365\">iris (hard aperture)<\/strong> ou joue sur le recouvrement pump\/mode (soft aperture) : commencer par soft aperture (pump waist &lt; laser mode). Si besoin ajoute un iris vers le miroir de sortie, r\u00e9glable.<\/h3>\n<\/li>\n<\/ol>\n<h2 data-start=\"3539\" data-end=\"3585\">5) Compensation de dispersion (pr\u00e9-r\u00e9glage)<\/h2>\n<ol data-start=\"3586\" data-end=\"3932\">\n<li data-start=\"3586\" data-end=\"3699\">\n<h3 data-start=\"3589\" data-end=\"3699\">Si tu as couple de prismes : position initiale prismes pour obtenir GDD \u2248 \u2212150 fs\u00b2 \/tour (valeur de d\u00e9part).<\/h3>\n<\/li>\n<li data-start=\"3700\" data-end=\"3789\">\n<h3 data-start=\"3703\" data-end=\"3789\">Si miroirs chirp\u00e9s : mettre nombre de miroirs chirp\u00e9s qui produisent GDD \u00e9quivalent.<\/h3>\n<\/li>\n<li data-start=\"3790\" data-end=\"3932\">\n<h3 data-start=\"3793\" data-end=\"3932\">Laisser marge pour ajuster apr\u00e8s apparition du mode-lock (l\u2019optimisation se fait souvent en se basant sur le spectre et l\u2019autocorr\u00e9lation).<\/h3>\n<\/li>\n<\/ol>\n<h2 data-start=\"3934\" data-end=\"3978\">6) Tentative de d\u00e9marrage KLM (proc\u00e9dure)<\/h2>\n<ol data-start=\"3979\" data-end=\"4237\">\n<li data-start=\"3979\" data-end=\"4059\">\n<h3 data-start=\"3982\" data-end=\"4059\">Augmente pompe lentement au-dessus du seuil KLM (surveiller spectre\/power).<\/h3>\n<\/li>\n<li data-start=\"4060\" data-end=\"4155\">\n<h3 data-start=\"4063\" data-end=\"4155\">Si self-start : attends, le bruit peut d\u00e9clencher; surveille la photodiode rapide\/spectre.<\/h3>\n<\/li>\n<li data-start=\"4156\" data-end=\"4237\">\n<h3 data-start=\"4159\" data-end=\"4237\">Sinon : <strong data-start=\"4167\" data-end=\"4206\">utilise le d\u00e9clenchement voice-coil<\/strong> selon le protocole ci-dessous.<\/h3>\n<\/li>\n<\/ol>\n<hr data-start=\"4239\" data-end=\"4242\" \/>\n<h3 data-start=\"4244\" data-end=\"4308\"><span style=\"color: #33cccc;\">R\u00e9glage et strat\u00e9gie pour la bobine voice-coil (d\u00e9clenchement)<\/span><\/h3>\n<h3 data-start=\"4309\" data-end=\"4456\">Ton voice-coil peut appliquer une petite perturbation contr\u00f4l\u00e9e au miroir \u2014 c\u2019est excellent car c\u2019est r\u00e9p\u00e9table et \u00e9vitable de taper m\u00e9caniquement.<\/h3>\n<h3 data-start=\"4458\" data-end=\"4470\">Principe<\/h3>\n<ul data-start=\"4471\" data-end=\"4675\">\n<li data-start=\"4471\" data-end=\"4675\">\n<h3 data-start=\"4473\" data-end=\"4675\">Une petite variation de longueur de cavit\u00e9 \/ angle du miroir va provoquer une fluctuation de phase\/amplitude qui peut permettre \u00e0 le gain non-lin\u00e9aire (Kerr) d\u2019amplifier une fluctuation et lancer le ML.<\/h3>\n<\/li>\n<\/ul>\n<h3 data-start=\"4677\" data-end=\"4721\">R\u00e9glages recommand\u00e9s (valeurs de d\u00e9part)<\/h3>\n<ul data-start=\"4722\" data-end=\"5555\">\n<li data-start=\"4722\" data-end=\"5031\">\n<h3 data-start=\"4724\" data-end=\"4853\"><strong data-start=\"4724\" data-end=\"4775\">D\u00e9placement cible du miroir (ordre de grandeur)<\/strong> : 0.5\u20135 \u00b5m lin\u00e9aire (pour changer la longueur optique d\u2019une fraction de \u03bb).<\/h3>\n<ul data-start=\"4856\" data-end=\"5031\">\n<li data-start=\"4856\" data-end=\"5031\">\n<h3 data-start=\"4858\" data-end=\"5031\">Pour \u03bb \u2248 800 nm, un d\u00e9placement de \u2248 400 nm correspond \u00e0 \u0394L \u2248 \u03bb\/2 ; mais un <em data-start=\"4934\" data-end=\"4940\">tilt<\/em> produit aussi un fort effet d\u2019alignement \u2192 donc <strong data-start=\"4989\" data-end=\"5006\">commencer bas<\/strong> (0.5 \u00b5m) et augmenter.<\/h3>\n<\/li>\n<\/ul>\n<\/li>\n<li data-start=\"5032\" data-end=\"5105\">\n<h3 data-start=\"5034\" data-end=\"5105\"><strong data-start=\"5034\" data-end=\"5070\">Dur\u00e9e de l\u2019impulsion de commande<\/strong> : 1\u201350 ms. Commence par 5\u201320 ms.<\/h3>\n<\/li>\n<li data-start=\"5106\" data-end=\"5248\">\n<h3 data-start=\"5108\" data-end=\"5248\"><strong data-start=\"5108\" data-end=\"5127\">Forme du signal<\/strong> : un <em data-start=\"5133\" data-end=\"5144\">half-sine<\/em> ou <em data-start=\"5148\" data-end=\"5164\">gaussian burst<\/em> est souvent plus doux qu\u2019un step, donc pr\u00e9f\u00e9rable. Exemple : demi-sinus de 10 ms.<\/h3>\n<\/li>\n<li data-start=\"5249\" data-end=\"5383\">\n<h3 data-start=\"5251\" data-end=\"5383\"><strong data-start=\"5251\" data-end=\"5273\">Fr\u00e9quence de burst<\/strong> (si tu envoies oscillations) : 50\u2013300 Hz, 5\u201320 cycles. Mais souvent un single short pulse (1\u201310 ms) suffit.<\/h3>\n<\/li>\n<li data-start=\"5384\" data-end=\"5475\">\n<h3 data-start=\"5386\" data-end=\"5475\"><strong data-start=\"5386\" data-end=\"5399\">Amplitude<\/strong> : commence \u00e0 10\u201320 % de la course max du coil ; augmente progressivement.<\/h3>\n<\/li>\n<li data-start=\"5476\" data-end=\"5555\">\n<h3 data-start=\"5478\" data-end=\"5555\"><strong data-start=\"5478\" data-end=\"5492\">R\u00e9petition<\/strong> : envoi ponctuel, attendre 0.5\u20132 s d\u2019observation entre essais.<\/h3>\n<\/li>\n<\/ul>\n<h3 data-start=\"5557\" data-end=\"5579\">Proc\u00e9dure pratique<\/h3>\n<ol data-start=\"5580\" data-end=\"6112\">\n<li data-start=\"5580\" data-end=\"5643\">\n<h3 data-start=\"5583\" data-end=\"5643\">Place le miroir au repos, pompe \u00e0 puissance KLM-threshold.<\/h3>\n<\/li>\n<li data-start=\"5644\" data-end=\"5711\">\n<h3 data-start=\"5647\" data-end=\"5711\">Envoie 1 pulse voice-coil (half-sine 10 ms, faible amplitude).<\/h3>\n<\/li>\n<li data-start=\"5712\" data-end=\"5816\">\n<h3 data-start=\"5715\" data-end=\"5816\">Observe spectre \/ photodiode : recherche apparition d\u2019un spectre \u00e9largi et d\u2019un train d\u2019impulsions.<\/h3>\n<\/li>\n<li data-start=\"5817\" data-end=\"5896\">\n<h3 data-start=\"5820\" data-end=\"5896\">Si rien, augmente amplitude par palier (\u00d71.5) et\/ou dur\u00e9e (jusqu\u2019\u00e0 50 ms).<\/h3>\n<\/li>\n<li data-start=\"5897\" data-end=\"6007\">\n<h3 data-start=\"5900\" data-end=\"6007\">Si apparition de ML mais instable, r\u00e9duis amplitude\/dur\u00e9e (tu veux <em data-start=\"5967\" data-end=\"5978\">perturber<\/em> sans casser l\u2019alignement).<\/h3>\n<\/li>\n<li data-start=\"6008\" data-end=\"6112\">\n<h3 data-start=\"6011\" data-end=\"6112\">Si coil cause d\u00e9r\u00e9glage permanent (tilt trop grand), r\u00e9duis amplitude ou utilise waveform plus douce.<\/h3>\n<\/li>\n<\/ol>\n<p data-start=\"6116\" data-end=\"6303\">Remarque : \u00e9viter d\u2019utiliser la bobine au maximum de course : risque de d\u00e9coller le miroir ou de modifier l\u2019alignement permanent. Toujours revenir \u00e0 position \u00ab repos \u00bb apr\u00e8s chaque essai.<\/p>\n<h3 data-start=\"6310\" data-end=\"6345\"><span style=\"color: #33cccc;\">Optimisation fine apr\u00e8s d\u00e9marrage<\/span><\/h3>\n<ol data-start=\"6346\" data-end=\"7035\">\n<li data-start=\"6346\" data-end=\"6444\">\n<h3 data-start=\"6349\" data-end=\"6444\"><strong data-start=\"6349\" data-end=\"6383\">Ajuster l\u2019iris (hard aperture)<\/strong> : fermer l\u00e9g\u00e8rement pour favoriser le pulse si CW revient.<\/h3>\n<\/li>\n<li data-start=\"6445\" data-end=\"6687\">\n<h3 data-start=\"6448\" data-end=\"6687\"><strong data-start=\"6448\" data-end=\"6472\">Optimiser dispersion<\/strong> : mesurer spectre; si trop \u00e9troit \u2192 moins de compensation n\u00e9gative (r\u00e9duire prisme separation ou ajouter dispersion positive), si trop large mais impulsions chirp\u00e9es \u2192 ajuster GDD pour raccourcir autocorr\u00e9lation.<\/h3>\n<\/li>\n<li data-start=\"6688\" data-end=\"6819\">\n<h3 data-start=\"6691\" data-end=\"6819\"><strong data-start=\"6691\" data-end=\"6718\">Recale mirror positions<\/strong> : l\u00e9g\u00e8re translation des miroirs de courbure (quelques dizaines \u00b5m) souvent am\u00e9liore stabilit\u00e9 ML.<\/h3>\n<\/li>\n<li data-start=\"6820\" data-end=\"6927\">\n<h3 data-start=\"6823\" data-end=\"6927\"><strong data-start=\"6823\" data-end=\"6834\">Mesures<\/strong> : prendre spectre, autocorr\u00e9lation, puissance moyenne, v\u00e9rifier stabilit\u00e9 \u00e0 1 min, 10 min.<\/h3>\n<\/li>\n<li data-start=\"6928\" data-end=\"7035\">\n<h3 data-start=\"6931\" data-end=\"7035\"><strong data-start=\"6931\" data-end=\"6949\">Si Q-switching<\/strong> : r\u00e9duire pompe ou augmenter pertes (OC plus grand T) pour repousser r\u00e9gime Q-switch.<\/h3>\n<\/li>\n<\/ol>\n<hr data-start=\"7037\" data-end=\"7040\" \/>\n<h3 data-start=\"7042\" data-end=\"7090\"><span style=\"color: #33cccc;\">Param\u00e8tres typiques \u00e0 viser apr\u00e8s optimisation<\/span><\/h3>\n<ul data-start=\"7091\" data-end=\"7371\">\n<li data-start=\"7091\" data-end=\"7169\">\n<h3 data-start=\"7093\" data-end=\"7169\">Puissance moyenne sortie mode-lock : variable (d\u00e9pend OC), ex. 200\u2013800 mW.<\/h3>\n<\/li>\n<li data-start=\"7170\" data-end=\"7254\">\n<h3 data-start=\"7172\" data-end=\"7254\">Dur\u00e9e d\u2019impulsion (typique Ti:saphir KLM) : 10\u2013100 fs (d\u00e9pend compensation GDD).<\/h3>\n<\/li>\n<li data-start=\"7255\" data-end=\"7371\">\n<h3 data-start=\"7257\" data-end=\"7371\">R\u00e9p\u00e9tition : ~80\u2013100 MHz (selon longueur cavit\u00e9) \u2192 longueur cavit\u00e9 \u2248 1.5\u20131.8 m pour 100\u201383 MHz. Ajuster si besoin.<\/h3>\n<\/li>\n<\/ul>\n<hr data-start=\"7373\" data-end=\"7376\" \/>\n<h3 data-start=\"7378\" data-end=\"7419\"><span style=\"color: #33cccc;\">Probl\u00e8mes fr\u00e9quents &amp; solutions rapides<\/span><\/h3>\n<ul data-start=\"7420\" data-end=\"7898\">\n<li data-start=\"7420\" data-end=\"7536\">\n<h3 data-start=\"7422\" data-end=\"7536\"><strong data-start=\"7422\" data-end=\"7450\">Pas de ML mais CW stable<\/strong> \u2192 cavit\u00e9 trop loin du bord de stabilit\u00e9 : rapprocher miroir (quelques dizaines \u00b5m).<\/h3>\n<\/li>\n<li data-start=\"7537\" data-end=\"7658\">\n<h3 data-start=\"7539\" data-end=\"7658\"><strong data-start=\"7539\" data-end=\"7569\">ML appara\u00eet puis dispara\u00eet<\/strong> \u2192 instabilit\u00e9 thermique ou vibration : attendre stabilisation thermique, isoler table.<\/h3>\n<\/li>\n<li data-start=\"7659\" data-end=\"7787\">\n<h3 data-start=\"7661\" data-end=\"7787\"><strong data-start=\"7661\" data-end=\"7700\">ML mais spectre \u00e9troit (pulse long)<\/strong> \u2192 manque de compensation n\u00e9gative \u2192 ajouter GDD n\u00e9gatif (prismes \/ chirped mirrors).<\/h3>\n<\/li>\n<li data-start=\"7788\" data-end=\"7898\">\n<h3 data-start=\"7790\" data-end=\"7898\"><strong data-start=\"7790\" data-end=\"7838\">Voice-coil d\u00e9clenche mais d\u00e9truit alignement<\/strong> \u2192 amplitude trop \u00e9lev\u00e9e : r\u00e9duire. Utiliser waveform douce.<\/h3>\n<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/article>\n<\/div><\/section><\/div>\n<div class=\"flex_column av_one_full  flex_column_div av-zero-column-padding first  avia-builder-el-22  el_after_av_one_full  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-3443 avia-img-lazy-loading-not-3443 avia_image' src=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/Capture-decran-2025-10-04-225633.png\" alt='' title='Capture d&#039;\u00e9cran 2025-10-04 225633' height=\"625\" width=\"509\"  itemprop=\"thumbnailUrl\" srcset=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/Capture-decran-2025-10-04-225633.png 509w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2022\/11\/Capture-decran-2025-10-04-225633-244x300.png 244w\" sizes=\"(max-width: 509px) 100vw, 509px\" \/><\/div><\/div><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":844,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-843","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\/843","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=843"}],"version-history":[{"count":29,"href":"https:\/\/www.swissrocketman.fr\/Wordpress\/index.php?rest_route=\/wp\/v2\/posts\/843\/revisions"}],"predecessor-version":[{"id":4061,"href":"https:\/\/www.swissrocketman.fr\/Wordpress\/index.php?rest_route=\/wp\/v2\/posts\/843\/revisions\/4061"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.swissrocketman.fr\/Wordpress\/index.php?rest_route=\/wp\/v2\/media\/844"}],"wp:attachment":[{"href":"https:\/\/www.swissrocketman.fr\/Wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=843"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.swissrocketman.fr\/Wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=843"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.swissrocketman.fr\/Wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=843"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}