{"id":6338,"date":"2026-06-03T23:07:08","date_gmt":"2026-06-03T21:07:08","guid":{"rendered":"https:\/\/www.swissrocketman.fr\/Wordpress\/?p=6338"},"modified":"2026-06-04T13:40:40","modified_gmt":"2026-06-04T11:40:40","slug":"pra-ln1000-tea-nitrogen-laser","status":"publish","type":"post","link":"https:\/\/www.swissrocketman.fr\/Wordpress\/pra-ln1000-tea-nitrogen-laser\/","title":{"rendered":"PRA LN1000 TEA Nitrogen laser"},"content":{"rendered":"

le\u00a0PRA LN1000<\/strong>\u00a0est bien un laser \u00e0 azote TEA de tr\u00e8s forte puissance cr\u00eate. La source que j\u2019ai retrouv\u00e9e l\u2019identifie comme \u201cthe most powerfull commercial nitrogen laser\u201d avec une impulsion de 600 ps, 2 MW de puissance de cr\u00eate, 1,3 mJ par impulsion, 0\u201320 Hz, un faisceau de 3 \u00d7 6 mm et une divergence de 3 \u00d7 7 mrad.<\/h3>\n

Identification<\/h2>\n

Le LN1000 est un\u00a0laser nitrogen TEA<\/strong>\u00a0de la soci\u00e9t\u00e9 PRA, et l\u2019auteur\/constructeur associ\u00e9 au d\u00e9veloppement indiqu\u00e9 sur la page est\u00a0Arnold Neracher<\/strong>.
\nLa documentation retrouv\u00e9e le pr\u00e9sente aussi comme une source UV \u00e0\u00a0337,1 nm<\/strong>, utilis\u00e9e pour le pompage de lasers \u00e0 colorant.<\/h3>\n

Caract\u00e9ristiques utiles<\/h2>\n

Les caract\u00e9ristiques explicitement donn\u00e9es sont les suivantes : puissance de sortie 2 MW, dur\u00e9e d\u2019impulsion 600 ps, \u00e9nergie par impulsion 1,3 mJ, fr\u00e9quence de r\u00e9p\u00e9tition 0 \u00e0 20 Hz, section du faisceau 3 \u00d7 6 mm, divergence 3 \u00d7 7 mrad.
\nEn ordre de grandeur, cette \u00e9nergie et cette dur\u00e9e correspondent bien \u00e0 une puissance cr\u00eate de l\u2019ordre du m\u00e9gawatt, ce qui est coh\u00e9rent avec l\u2019intitul\u00e9 \u201c1 MW en 500 ps\u201d que tu mentionnais avant.<\/h3>\n<\/div><\/section><\/div>
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En prenant les valeurs publi\u00e9es pour le LN1000 \u2014\u00a01,3 mJ<\/strong>\u00a0par impulsion et\u00a0600 ps<\/strong>\u00a0\u2014 on peut estimer la fluence et l\u2019intensit\u00e9 cr\u00eate pour plusieurs hypoth\u00e8ses de section de faisceau.<\/p>\n

Formules<\/h2>\n

La fluence vaut\u00a0F=E\/A<\/span>F<\/span>=<\/span><\/span>E<\/span>\/<\/span>A<\/span><\/span><\/span><\/span>, et l\u2019intensit\u00e9 cr\u00eate vaut\u00a0Icr\u00eate=E\/(A\u2009\u03c4)<\/span>I<\/span>cr\u00ea<\/span>te<\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span>=<\/span><\/span>E<\/span>\/<\/span>(<\/span>A<\/span>\u03c4<\/span>)<\/span><\/span><\/span><\/span>.
\nAvec\u00a0E=1,3 mJ\u00a0<\/span><\/span>et\u00a0\u03c4=600\u00a0ps<\/span><\/span>, on obtient des valeurs tr\u00e8s \u00e9lev\u00e9es d\u00e8s que le faisceau est focalis\u00e9 mod\u00e9r\u00e9ment.<\/p>\n

Cas direct avec la section annonc\u00e9e<\/h2>\n

La documentation donne une section de faisceau de\u00a03 \u00d7 6 mm<\/strong>\u00a0et une divergence de\u00a03 \u00d7 7 mrad<\/strong>.
\nEn prenant simplement l\u2019aire rectangulaire\u00a0A=18\u00a0mm2=1,8\u00d710\u22125\u00a0m2<\/span><\/span>:<\/p>\n

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    Fluence<\/strong>\u00a0:\u00a0F\u224872\u00a0J\/m2=7,2\u00a0mJ\/cm2<\/span><\/span><\/p>\n<\/li>\n

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    Intensit\u00e9 cr\u00eate<\/strong>\u00a0:\u00a0Icr\u00eate\u22481,2\u00d71011 W\/m2=12 MW\/cm2<\/span><\/span><\/p>\n<\/li>\n<\/ul>\n

    Si le faisceau est approxim\u00e9 autrement<\/h2>\n

    Comme la section r\u00e9elle peut \u00eatre plus proche d\u2019une ellipse ou d\u2019un spot focalis\u00e9, voici des ordres de grandeur utiles :<\/p>\n

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      Ellipse \u00e9quivalente 3 \u00d7 6 mm<\/strong>\u00a0: m\u00eame r\u00e9sultat que ci-dessus, soit environ\u00a07,2 mJ\/cm\u00b2<\/strong>\u00a0et\u00a012 MW\/cm\u00b2<\/strong>.<\/span><\/p>\n<\/li>\n

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      Spot circulaire de 3 mm de diam\u00e8tre<\/strong>\u00a0: environ\u00a018,5 mJ\/cm\u00b2<\/strong>\u00a0et\u00a031 MW\/cm\u00b2<\/strong>.<\/span><\/p>\n<\/li>\n

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      Spot circulaire de 2 mm de diam\u00e8tre<\/strong>\u00a0: environ\u00a041 mJ\/cm\u00b2<\/strong>\u00a0et\u00a069 MW\/cm\u00b2<\/strong>.<\/span><\/p>\n<\/li>\n<\/ul>\n

      Interpr\u00e9tation physique<\/h2>\n

      Pour un laser TEA N\u2082 de ce type, ces chiffres sont tout \u00e0 fait coh\u00e9rents avec un r\u00e9gime o\u00f9 l\u2019on atteint facilement des intensit\u00e9s capables d\u2019induire fluorescence forte, photolyse UV, ou des effets non lin\u00e9aires si on focalise davantage.
      \nLa valeur exacte d\u00e9pend surtout de la vraie g\u00e9om\u00e9trie du faisceau, de son profil spatial, et de la position de mesure par rapport \u00e0 la sortie du laser<\/p>\n<\/div><\/section><\/div>\n

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