{"id":2422,"date":"2023-08-05T11:30:47","date_gmt":"2023-08-05T09:30:47","guid":{"rendered":"http:\/\/s848664668.onlinehome.fr\/Wordpress\/?p=2422"},"modified":"2025-12-21T16:00:33","modified_gmt":"2025-12-21T15:00:33","slug":"plasma-balls-with-20-mw-q-switch-yag-laser","status":"publish","type":"post","link":"https:\/\/www.swissrocketman.fr\/Wordpress\/?p=2422","title":{"rendered":"PLASMA BALLS WITH 20 MW Q-switch YAG LASER"},"content":{"rendered":"

Le claquage optique est li\u00e9e au ph\u00e9nom\u00e8ne de claquage qui a \u00e9t\u00e9 \u00e9tudi\u00e9 et mod\u00e9lis\u00e9 avec succ\u00e8s vers la fin des ann\u00e9es 1950. On d\u00e9crit l’effet d’une forte ionisation locale du corps, lorsque le plasma atteint des densit\u00e9s au-del\u00e0 de la valeur critique (entre 1020<\/sup>\u00a0et 1022<\/sup>\u00a0\u00e9lectrons \/ cm\u00b3).
\nUne fois que le plasma \u00e0 atteint la densit\u00e9 critique, l’\u00e9nergie de l’impulsion lumineuse est absorb\u00e9e, et la temp\u00e9rature du plasma augmente consid\u00e9rablement. Une expansion coulombienne explosive suit, et forme une onde de choc tr\u00e8s puissant et \u00e0 travers le mat\u00e9riau qui se d\u00e9veloppe sur quelques ns .
\n\u00c0 l’oeil nu, le claquage optique ressemble \u00e0 une \u00e9tincelle et si l’\u00e9v\u00e9nement se produit dans l’air ou un autre fluide, il est m\u00eame possible d’entendre un bruit de claquage caus\u00e9e par l’expansion du plasma explosif.<\/h4>\n

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Claquage optique obtenu avec une lentille de 2 m\u00e8tres de focale<\/h5>\n<\/div><\/section><\/p><\/div><\/p>\n
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Filamentation dans l’air avec un laser r\u00e9g\u00e9n\u00e9ratif \u00e0 disque\u00a0 DIRA-200 de TRUMPF<\/h5>\n
Energie par pulse 200 mJ en 600 fs soit\u00a0 33TW\u00a0 \u00e0 1kHz.<\/h5>\n<\/div><\/section><\/p><\/div>\n
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