{"id":10323,"date":"2026-08-14T17:02:13","date_gmt":"2026-08-14T15:02:13","guid":{"rendered":"https:\/\/www.swissrocketman.fr\/Wordpress\/?p=10323"},"modified":"2026-08-14T18:56:33","modified_gmt":"2026-08-14T16:56:33","slug":"quanta-ray-gcr190-q-switch-yag-laser","status":"publish","type":"post","link":"https:\/\/www.swissrocketman.fr\/Wordpress\/quanta-ray-gcr190-q-switch-yag-laser\/","title":{"rendered":"Quanta Ray GCR190 Q-switch YAG laser"},"content":{"rendered":"
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Spectra-Physics Quanta-Ray de la famille GCR\/Lab-190<\/strong>, un Nd:YAG pomp\u00e9 par lampes flash et d\u00e9clench\u00e9 \u00e9lectro-optiquement par cellule de Pockels. Votre exemplaire est particuli\u00e8rement int\u00e9ressant parce qu\u2019il est tr\u00e8s \u00e9quip\u00e9 : on voit notamment le g\u00e9n\u00e9rateur d\u2019harmoniques Quanta-Ray HG-4-D1<\/strong>, configur\u00e9 pour SHG-I + THG<\/strong>, donc pour produire 532 et 355 nm \u00e0 partir du 1064 nm.<\/p>\n<\/div><\/section><\/div>\n

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Les deux chambres de pompage sont un point essentiel<\/h3>\n

Votre laser poss\u00e8de deux ensembles Nd:YAG \/ chambre de pompage dans le m\u00eame oscillateur<\/strong>. Ce choix n’est pas uniquement destin\u00e9 \u00e0 augmenter l’\u00e9nergie.<\/p>\n

Il permet surtout de r\u00e9duire les cons\u00e9quences de la bir\u00e9fringence thermique<\/strong> induite dans les barreaux YAG. Le pompage flash cr\u00e9e un gradient radial de temp\u00e9rature ; le barreau devient simultan\u00e9ment une lentille thermique et un \u00e9l\u00e9ment bir\u00e9fringent. Dans une cavit\u00e9 polaris\u00e9e comportant une cellule de Pockels, cette d\u00e9polarisation devient particuli\u00e8rement g\u00eanante.<\/p>\n

Spectra-Physics explique pr\u00e9cis\u00e9ment que son architecture \u00e0 deux barreaux Nd:YAG et deux chambres de pompage<\/strong> r\u00e9alise une compensation intra-oscillateur de cette bir\u00e9fringence thermique, ce qui am\u00e9liore puissance moyenne et qualit\u00e9 spatiale.<\/p>\n<\/div><\/section><\/div>\n

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