{"id":6833,"date":"2026-06-10T10:29:48","date_gmt":"2026-06-10T08:29:48","guid":{"rendered":"https:\/\/www.swissrocketman.fr\/Wordpress\/?p=6833"},"modified":"2026-06-10T12:56:51","modified_gmt":"2026-06-10T10:56:51","slug":"mira900-femtosecond-laser","status":"publish","type":"post","link":"https:\/\/www.swissrocketman.fr\/Wordpress\/mira900-femtosecond-laser\/","title":{"rendered":"MIRA900 femtosecond laser"},"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; '><div  class='avia-image-container  av-styling-    avia-builder-el-1  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-6853 avia-img-lazy-loading-not-6853 avia_image' src=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs13a.png\" alt='' title='qs13a' height=\"486\" width=\"1332\"  itemprop=\"thumbnailUrl\" srcset=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs13a.png 1332w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs13a-300x109.png 300w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs13a-1030x376.png 1030w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs13a-768x280.png 768w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs13a-705x257.png 705w\" sizes=\"(max-width: 1332px) 100vw, 1332px\" \/><\/div><\/div><\/div><\/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; '><div  class='avia-image-container  av-styling-    avia-builder-el-3  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-6835 avia-img-lazy-loading-not-6835 avia_image' src=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs1a.png\" alt='' title='qs1a' height=\"535\" width=\"1300\"  itemprop=\"thumbnailUrl\" srcset=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs1a.png 1300w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs1a-300x123.png 300w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs1a-1030x424.png 1030w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs1a-768x316.png 768w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs1a-705x290.png 705w\" sizes=\"(max-width: 1300px) 100vw, 1300px\" \/><\/div><\/div><\/div><\/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-6837 avia-img-lazy-loading-not-6837 avia_image' src=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs2a.png\" alt='' title='qs2a' height=\"644\" width=\"1269\"  itemprop=\"thumbnailUrl\" srcset=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs2a.png 1269w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs2a-300x152.png 300w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs2a-1030x523.png 1030w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs2a-768x390.png 768w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs2a-705x358.png 705w\" sizes=\"(max-width: 1269px) 100vw, 1269px\" \/><\/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_full  column-top-margin\" style='border-radius:0px; '><div  class='avia-video avia-video-16-9   av-lazyload-immediate  av-lazyload-video-embed  '   itemprop=\"video\" itemtype=\"https:\/\/schema.org\/VideoObject\"  data-original_url='https:\/\/youtu.be\/r6fXOnDz5KQ' ><script type='text\/html' class='av-video-tmpl'><div class='avia-iframe-wrap'><iframe loading=\"lazy\" title=\"Laser oscillateur femtoseconde MIRA de COHERENT\" width=\"1500\" height=\"844\" src=\"https:\/\/www.youtube.com\/embed\/r6fXOnDz5KQ?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\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div><\/script><div class='av-click-to-play-overlay'><div class=\"avia_playpause_icon\"><\/div><\/div><\/div><\/div><div class=\"flex_column av_one_full  flex_column_div av-zero-column-padding first  avia-builder-el-8  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-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-6838 avia-img-lazy-loading-not-6838 avia_image' src=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs3a.png\" alt='' title='qs3a' height=\"675\" width=\"916\"  itemprop=\"thumbnailUrl\" srcset=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs3a.png 916w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs3a-300x221.png 300w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs3a-768x566.png 768w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs3a-705x520.png 705w\" sizes=\"(max-width: 916px) 100vw, 916px\" \/><\/div><\/div><\/div><\/div><\/p>\n<div class=\"flex_column av_one_full  flex_column_div av-zero-column-padding first  avia-builder-el-10  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-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-6846 avia-img-lazy-loading-not-6846 avia_image' src=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs6aa.png\" alt='' title='qs6aa' height=\"442\" width=\"1278\"  itemprop=\"thumbnailUrl\" srcset=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs6aa.png 1278w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs6aa-300x104.png 300w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs6aa-1030x356.png 1030w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs6aa-768x266.png 768w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs6aa-705x244.png 705w\" sizes=\"(max-width: 1278px) 100vw, 1278px\" \/><\/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_full  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-6854 avia-img-lazy-loading-not-6854 avia_image' src=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs12a.png\" alt='' title='qs12a' height=\"665\" width=\"970\"  itemprop=\"thumbnailUrl\" srcset=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs12a.png 970w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs12a-300x206.png 300w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs12a-768x527.png 768w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs12a-705x483.png 705w\" sizes=\"(max-width: 970px) 100vw, 970px\" \/><\/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; '><section class=\"av_textblock_section \"  itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock  '   itemprop=\"text\" ><p><span style=\"font-size: large;\"><span style=\"color: #444444;\"><span style=\"font-family: Verdana;\">Dans une cavit\u00e9 laser dont le milieu amplificateur poss\u00e8de une bande d&rsquo;\u00e9mission suffisamment large comme c\u2019est le cas du Titane-Saphir, plusieurs milliers de modes longitudinaux de la cavit\u00e9 peuvent osciller et \u00eatre amplifi\u00e9es. Si il n\u2019y a aucune relation de phase entre ces modes, l\u2019\u00e9mission du laser est constitu\u00e9e<br \/>\nd\u2019une superposition incoh\u00e9rente de ces modes en r\u00e9gime continu. Par contre si on arrive par un moyen quelconque \u00e0 mettre en phase ces modes dans la cavit\u00e9, le r\u00e9gime d\u2019\u00e9mission devient impulsionnel, on parle alors de blocage de modes (mode-locking) .<br \/>\nLe blocage de modes est r\u00e9alis\u00e9 en introduisant dans la cavit\u00e9 laser un \u00e9l\u00e9ment qui module les pertes.<br \/>\nPour favoriser le mode impulsionnel, cet \u00e9l\u00e9ment doit avoir une transmission qui augmente avec l\u2019intensit\u00e9 qui le traverse. Dans les oscillateurs Titane-Saphir c\u2019est l\u2019effet Kerr Optique qui est utilis\u00e9.<br \/>\nEn effet il va introduire l\u2019apparition d\u2019une lentille Kerr dans le cristal lorsque l\u2019intensit\u00e9 augmente.<br \/>\nCela va modifier la divergence du faisceau dans la cavit\u00e9.<br \/>\nUne fente plac\u00e9e dans la cavit\u00e9 va permettre de s\u00b4\u00e9lectionner le mode correspondant au r\u00e9gime impulsionnel<br \/>\nqui va pouvoir ainsi s\u2019installer durablement. Il est \u00e9galement possible d\u2019adopter une g\u00e9om\u00e9trie de la cavit\u00e9<br \/>\nlaser qui favorise le mode impulsionnel par rapport au mode continu.<br \/>\nLe seconde condition \u00e0 r\u00e9aliser est la compensation de la dispersion du temps de groupe introduite par<br \/>\nles \u00e9l\u00e9ments travers\u00e9s, principalement le cristal. En effet chaque mode a une longueur d\u2019onde diff\u00e9rente<br \/>\net parcourt donc un chemin optique diff\u00e9rent dans la cavit\u00e9. La compensation est r\u00e9alis\u00e9e soit avec une<br \/>\nligne \u00e0 prismes introduite dans la cavit\u00e9, soit pour les oscillateurs plus r\u00e9cents, \u00e0 l\u2019aides de miroirs\u00a0 chirp\u00e9s.<\/span><\/span> <\/span><\/p>\n<\/div><\/section><\/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_image  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-6848 avia-img-lazy-loading-not-6848 avia_image' src=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs7a.png\" alt='' title='qs7a' height=\"667\" width=\"1072\"  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class='avia-image-overlay-wrap'><img decoding=\"async\" class='wp-image-6850 avia-img-lazy-loading-not-6850 avia_image' src=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs9a.png\" alt='' title='qs9a' height=\"560\" width=\"1325\"  itemprop=\"thumbnailUrl\" srcset=\"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs9a.png 1325w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs9a-300x127.png 300w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs9a-1030x435.png 1030w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs9a-768x325.png 768w, https:\/\/www.swissrocketman.fr\/Wordpress\/wp-content\/uploads\/2026\/06\/qs9a-705x298.png 705w\" sizes=\"(max-width: 1325px) 100vw, 1325px\" \/><\/div><\/div><\/div>\n<div  class='avia-image-container  av-styling-    avia-builder-el-20  el_after_av_image  el_before_av_image  avia-align-center '  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\/><\/div><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":6861,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-6833","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-lasers-a-solides"],"_links":{"self":[{"href":"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-json\/wp\/v2\/posts\/6833","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-json\/wp\/v2\/comments?post=6833"}],"version-history":[{"count":13,"href":"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-json\/wp\/v2\/posts\/6833\/revisions"}],"predecessor-version":[{"id":6860,"href":"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-json\/wp\/v2\/posts\/6833\/revisions\/6860"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-json\/wp\/v2\/media\/6861"}],"wp:attachment":[{"href":"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-json\/wp\/v2\/media?parent=6833"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-json\/wp\/v2\/categories?post=6833"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.swissrocketman.fr\/Wordpress\/wp-json\/wp\/v2\/tags?post=6833"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}