{"id":257,"count":3,"description":"OPA et OPCPA sont des techniques utilis\u00e9es pour g\u00e9n\u00e9rer des impulsions laser femtoseconde ultrarapides. L'OPA utilise un cristal non lin\u00e9aire pour produire des longueurs d'onde accordables et une \u00e9nergie \u00e9lev\u00e9e, tandis que l'OPCPA combine l'OPA avec une amplification d'impulsions chirp\u00e9es pour une puissance de cr\u00eate accrue. 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