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              <p>RÉSUMÉ Les fibres optiques dopées au thulium pompées à 1,07 µm offrent la perspective de lasers et amplificateurs fonctionnant à de nouvelles longueurs d'onde. Ce système permet d'envisager de nombreuses transitions optiques encore inexploitées dans des fibres à base de silice. Le principal verrou technologique de ce système est le photo-noircissement. Nous présentons ici la réduction du photo-noircissement en co-dopant la silice avec du cérium ou du lanthane. Un modèle pour le photo-noircissement est proposé. Ce modèle implique un processus séquentiel faisant intervenir un défaut et un changement de valence de Tm 3+ en Tm 2+. Les effets bénéfiques du co-dopant sont aussi expliqués grâce à ce modèle.</p>
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