{"id":6623,"date":"2026-06-07T11:12:36","date_gmt":"2026-06-07T09:12:36","guid":{"rendered":"https:\/\/www.swissrocketman.fr\/Wordpress\/?p=6623"},"modified":"2026-06-07T14:35:16","modified_gmt":"2026-06-07T12:35:16","slug":"laser-azote-a-decharge-longitudinal-capillaire-et-a-pression-atmospherique","status":"publish","type":"post","link":"https:\/\/www.swissrocketman.fr\/Wordpress\/laser-azote-a-decharge-longitudinal-capillaire-et-a-pression-atmospherique\/","title":{"rendered":"Laser azote \u00e0 d\u00e9charge longitudinal capillaire et \u00e0 pression atmosph\u00e9rique"},"content":{"rendered":"
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Ce laser prototype en cours de construction est un laser LEA N2.
\nc’est \u00e0 dire un laser \u00e0 excitation longitudinal et \u00e0 pression atmosph\u00e9rique. Or pour excit\u00e9 la transition laser il est n\u00e9cessaire d’une tension de 100V\/cm\/torr
\n<\/span>
\n<\/span>LEA= Longitudinaly Excited Atmospheric-pressure laser<\/b><\/span><\/span><\/h4>\n

voici un prototype de laser \u00e0 azote \u00e0 d\u00e9charge capillaire longitudinal et \u00e0 pression atmosph\u00e9rique.
\nIl se compose de 2 g\u00e9n\u00e9rateurs de Marx de 22 \u00e9tages chacun et de +220 kV et -220 kV soit 440 kV de sortie !
\n<\/span>
\nChaque \u00e9tage se compose d’un condensateur c\u00e9ramique de 2 nF\/10 kV de 2 diodes HT et d’un \u00e9clateur.
\nLa capacit\u00e9 d’\u00e9rection est de 45 pF et une dur\u00e9e de 5 ns ce qui donne une puissance instantan\u00e9e \u00e9lectrique de 860 MW soit 1000 A pendant 5 ns donc id\u00e9al pour excit\u00e9 un laser \u00e0 azote !
\nL’\u00e9nergie dans la d\u00e9charge est de 4.3 Joule ce n’est pas beaucoup mais en 5 ns \u00e7a fait quand m\u00eame 860 M\u00e9gawatts \u00e9lectrique !<\/span><\/p>\n<\/div><\/section><\/div>\n

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laser \u00e0 azote \u00e0 d\u00e9charge longitudinal se compose d’un circuit \u00e0 transfert de charge pr\u00e9sentant la meilleure topologie gr\u00e2ce au passage du tube de d\u00e9charge \u00e0 travers les 2 condensateurs de titanate de barium ce qui permet d’avoir l’inductivit\u00e9 la plus faible possible avec ce type de montage.<\/span><\/span><\/span>
\nLa d\u00e9charge principal \u00e0 lieu apr\u00e8s une d\u00e9charge de reptation par couplage capacitif entre le conducteur ext\u00e9rieur en cuivre d\u00e9pos\u00e9 sur le capillaire en verre ce qui permet une pr\u00e9-ionisation du canal de d\u00e9charge.<\/span><\/span><\/span>
\nDurant la charge les condensateurs C1 etC2 sont charg\u00e9s \u00e0 18kV puis lors de la d\u00e9charge l’\u00e9clateur SP1 renverse la polarit\u00e9 de C2 qui se trouve alors en s\u00e9rie avec C1 donc la tension est doubl\u00e9 et se d\u00e9charge alors dans le tube capillaire.<\/span><\/span><\/span><\/h4>\n<\/div><\/section><\/div>\n
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Ce laser \u00e0 d\u00e9charge longitudinal travaillant \u00e0 basse pression avec un m\u00e9lange He-N2 \u00e0 \u00e9t\u00e9 construit pour v\u00e9rifier l’homog\u00e9n\u00e9ite de la d\u00e9charge.<\/h4>\n<\/div><\/section><\/p><\/div>\n
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