Lasers visibles & UV

Nous développons des lasers solides émettant dans le proche infrarouge pour ensuite atteindre le spectre visible par effet non linéaire (doublement, triplement de fréquences ou somme de fréquence). Nous avons étudié différentes configurations pour atteindre des longueurs d'onde à 488 nm, 465 nm et 440 nn, initialement produites par des lasers à gaz. Nous avons démontré l'émission "trois niveaux" à 880 nm de l'ion Néodyme dans un cristal d'YVO4. Pour atteindre le domaine de l'UV, nous travaillons sur de nouveaux cristaux non linéaires de la famille de borates, en liaison avec des laboratoires de cristallogénèse.

Chercheurs impliqués : François BALEMBOIS, Gaelle LUCAS-LECLIN, Fabiola De ALMEIDA CAMARGO

(Description en anglais uniquement)

• Blue laser emission at around 490 nm

  We have studied different ways to produce blue light around 490 nm. The SHG of a Yb:S-FAP or Nd:YKW laser emitting on it's three level transition at 985 nm and intracavity pumped by a Nd:YVO4 laser at 914 nm. We also investigated the sum frequency mixing of two lines (1064 and 912 nm) of a Nd:YVO4 laser. We have previously sudied the three level emission at 976 in an Ytterbium doped fiber and the SHG in a ppLN waveguide.

• Three-level emission in Nd doped crystals

  We have demonstrated, for the first time, the laser emission of the true three-level transition at 879 nm from a diode pumped Nd:GdVO4 crystal and the quasi three levels transition at 899 nm from a Nd:YAG crystal. By intracavity SHG, this leads to laser emission in the deeper blue at 440 and 450 nm.

• Blue laser at 465 nm based on Nd doped crystals

  In order to reach the 465 nm range, we have studied two differents ways : the SHG of the quasi three levels emission at 930 nm in Nd:YAP crystal and the sum frequency mixing of 912 nm emision in Nd:YVO4 and the 946 nm emission in Nd:YAG. This wavelength is used for fluorescence studies of Europium doped YVO4 nanoparticules.