{"id":5111,"date":"2026-03-17T18:16:48","date_gmt":"2026-03-17T17:16:48","guid":{"rendered":"https:\/\/www.swissrocketman.fr\/Wordpress\/?p=5111"},"modified":"2026-04-05T21:29:38","modified_gmt":"2026-04-05T19:29:38","slug":"mesure-par-autocorrelation-tpa-du-laser-aplitude-system","status":"publish","type":"post","link":"https:\/\/www.swissrocketman.fr\/Wordpress\/?p=5111","title":{"rendered":"Mesure par autocorr\u00e9lation TPA du laser APLITUDE SYSTEM"},"content":{"rendered":"

Voici les diff\u00e9rents seuil que l’on doit respecter en utilisant des d\u00e9tecteurs TPA LED en GaP et InGaAs<\/span><\/h3>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0seuil utile : 10\u2078 W\/cm\u00b2\u00a0 \u00a0<\/strong><\/span><\/h2>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0seuil danger : 10\u2079 W\/cm\u00b2<\/strong><\/span><\/h2>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0destruction : \u226510\u00b9\u2070 W\/cm\u00b2<\/strong><\/span><\/h2>\n<\/div><\/section><\/div>\n
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Cette photo montre uniquement le signal obtenu par la TPA et non la dur\u00e9e de pulse du laser. Il s’agit donc de r\u00e9aliser un autocorr\u00e9lateur en divisant le faisceau laser en 2 parts identique au moyen d’un miroir semi-transparent (50\/50) d’envoyer les pulses dans un bras fixe et l’autre dans un bras mobile en d\u00e9pla\u00e7ant un miroir au moyen d’une vis microm\u00e9trique et de not\u00e9 l’intensit\u00e9 lumineuse \u00e0 chaque d\u00e9placement du miroir. Une picoseconde \u00e9gale 150 microns.<\/span><\/h4>\n<\/div><\/section><\/div>\n
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Kingbright L-7104LGD (3 mm)<\/h2>\n

Diode LED utilis\u00e9e en absorption \u00e0 2 photons utilis\u00e9e en polarisation inverse ( 10 – 25 V ). Elle est compos\u00e9e de GaAsP\/GaP.<\/p>\n<\/div><\/section><\/p><\/div>\n

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Autocorr\u00e9lateur compos\u00e9 d’un miroir fixe et d’un miroir mobile avec une vis microm\u00e9trique permettent de modifier la longueur du bras optique permettant de faire la mesure temporelle\u00a0 1\u00a0 micron =\u00a0 6.7 fs<\/p>\n<\/div><\/section>
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L’absorption \u00e0 deux photons<\/b>\u00a0(ADP<\/b>) est l’absorption<\/a>\u00a0simultan\u00e9e de deux\u00a0photons<\/a>\u00a0de fr\u00e9quences identiques ou diff\u00e9rentes dans le but d’exciter une\u00a0mol\u00e9cule<\/a>\u00a0dans un \u00e9tat donn\u00e9 (habituellement, l’\u00e9tat fondamental<\/a>) \u00e0 un\u00a0\u00e9tat \u00e9lectronique<\/a>\u00a0de plus haute \u00e9nergie. La diff\u00e9rence d’\u00e9nergie entre ces deux \u00e9tats est \u00e9gale \u00e0 la somme des \u00e9nergies des deux photons. L’absorption \u00e0 deux photons est un processus de second ordre, de plusieurs degr\u00e9s de magnitude plus faible que l’absorption lin\u00e9aire. Elle diff\u00e8re de l’absorption lin\u00e9aire<\/a>\u00a0parce qu’elle est proportionnelle au carr\u00e9 de l’intensit\u00e9<\/a>\u00a0de la lumi\u00e8re, ce qui en fait un processus d’optique non lin\u00e9aire<\/a><\/sup>.<\/p>\n<\/div><\/section><\/div>\n

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