{"id":4844,"date":"2026-03-12T11:56:09","date_gmt":"2026-03-12T10:56:09","guid":{"rendered":"https:\/\/www.swissrocketman.fr\/Wordpress\/?p=4844"},"modified":"2026-03-12T17:37:23","modified_gmt":"2026-03-12T16:37:23","slug":"laser-a-colorant-rh6g-pompe-par-laser-co2-tea","status":"publish","type":"post","link":"https:\/\/www.swissrocketman.fr\/Wordpress\/?p=4844","title":{"rendered":"Laser \u00e0 colorant Rh6G pomp\u00e9 par laser CO2 TEA"},"content":{"rendered":"

Pompage d\u2019un laser \u00e0 colorant Rhodamine 6G par plasma de dioxyde de silicium g\u00e9n\u00e9r\u00e9 par un laser CO\u2082 TEA<\/span><\/h2>\n<\/div><\/section><\/div>
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Pompage d\u2019un laser \u00e0 colorant Rhodamine 6G par plasma de dioxyde de silicium g\u00e9n\u00e9r\u00e9 par un laser CO\u2082 TEA<\/h3>\n

Le pompage d\u2019un laser \u00e0 colorant par un plasma de dioxyde de silicium (SiO\u2082) constitue une approche exp\u00e9rimentale originale d\u00e9velopp\u00e9e lors d\u2019exp\u00e9riences de claquage di\u00e9lectrique de l\u2019air r\u00e9alis\u00e9es avec un laser CO\u2082 TEA<\/strong> d\u00e9livrant des impulsions d\u2019environ 10 J<\/strong>.<\/p>\n

Un pompage direct du colorant par ce laser n\u2019est pas possible, car la longueur d\u2019onde d\u2019\u00e9mission du laser CO\u2082 TEA est 10,6 \u00b5m (10600 nm)<\/strong>, tandis que l\u2019excitation efficace de la Rhodamine 6G (Rh6G)<\/strong> n\u00e9cessite des photons de plus haute \u00e9nergie correspondant \u00e0 une bande spectrale situ\u00e9e approximativement entre 300 nm et 450 nm<\/strong>.<\/p>\n

Le principe propos\u00e9 consiste donc \u00e0 convertir le rayonnement infrarouge du laser CO\u2082 en rayonnement ultraviolet et visible<\/strong> par la cr\u00e9ation d\u2019un plasma \u00e0 la surface d\u2019un capillaire de quartz<\/strong>.<\/p>\n

Lorsque l\u2019impulsion du laser CO\u2082 est focalis\u00e9e sur la surface du quartz, un plasma lin\u00e9aire d\u2019environ 22 mm de longueur<\/strong> est g\u00e9n\u00e9r\u00e9. Ce plasma est constitu\u00e9 principalement de dioxyde de silicium vaporis\u00e9 et ionis\u00e9<\/strong>, port\u00e9 \u00e0 une temp\u00e9rature estim\u00e9e de l\u2019ordre de 15 000 \u00b0C<\/strong>. \u00c0 cette temp\u00e9rature, le plasma \u00e9met un rayonnement intense dont le spectre se rapproche de celui d\u2019un corps noir \u00e0 haute temp\u00e9rature<\/strong>, produisant ainsi une \u00e9mission continue s\u2019\u00e9tendant de l\u2019ultraviolet au proche infrarouge.<\/p>\n

Cette \u00e9mission large bande peut servir de source de pompage optique pour un laser \u00e0 colorant<\/strong>.<\/p>\n

Dans la configuration exp\u00e9rimentale actuelle, le volume actif de Rhodamine 6G pomp\u00e9 est d\u2019environ 17 mm\u00b3<\/strong>, avec une concentration de 1 \u00d7 10\u207b\u2074 mol\u00b7L\u207b\u00b9<\/strong>.<\/p>\n

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