J. Phys. IV France 04 (1994) C4-451-C4-454
Visible optical spectra of [MATH]-irradiated uranium - doped ZBLAN fibresS. MAGNE1, G. BOISDÉ1, G. MONNOM2, Y. OUERDANE3, M. DRUETTA3, J.P. GOURE3 and G. MAZÉ4
1 Commissariat à l'Energie Atomique, LETI-DEIN, CEN Saclay, 91191 Gif-sur-Yvette cedex, France
2 Laboratoire de Physique de la Matière Condensée, URA 190 du CNRS, Parc Valrose, 06108 Nice cedex, France
3 Laboratoire TSI, URA 842 du CNRS, 42023 Saint-Etienne cedex 2, France
4 Le Verre Fluoré SA, ZI du Champ Martin, 35770 Vern-sur-Seiche, France
Actinides, particularly uranium, are again of interest because these elements provide a broad spectroscopic tunability and open a new field of fibre laser applications. The uranium ion possesses many oxidation states, the most stable being U4+ and U6+. U3+ is an unusual oxidation state in fluorides. U3+ is of interest because it can provide an efficient laser emission of between 2 and 2.7 µm. We report visible absorption and fluorescence spectra of pure and γ-irradiated uranium - doped ZBLAN fibres. We show that γirradiation leads to a high reduction of U4+ into U3+, which is stable over a few years. Strong absorption bands of U4+ and U3+, centered at 650 nm and 860 nm respectively, enable us to estimate the change of the uranium oxidation state.
© EDP Sciences 1994