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Cr4+-doped silica optical fibres: absorption and fluorescence properties

Published online by Cambridge University Press:  15 August 2000

V. Felice
Affiliation:
Laboratoire de Physique de la Matière Condensée (UMR CNRS UNSA 6622), Université de Nice Sophia Antipolis, parc Valrose, 06108 Nice Cedex 2, France
B. Dussardier*
Affiliation:
Laboratoire de Physique de la Matière Condensée (UMR CNRS UNSA 6622), Université de Nice Sophia Antipolis, parc Valrose, 06108 Nice Cedex 2, France
J. K. Jones
Affiliation:
Laboratoire de Physique de la Matière Condensée (UMR CNRS UNSA 6622), Université de Nice Sophia Antipolis, parc Valrose, 06108 Nice Cedex 2, France
G. Monnom
Affiliation:
Laboratoire de Physique de la Matière Condensée (UMR CNRS UNSA 6622), Université de Nice Sophia Antipolis, parc Valrose, 06108 Nice Cedex 2, France
D. B. Ostrowsky
Affiliation:
Laboratoire de Physique de la Matière Condensée (UMR CNRS UNSA 6622), Université de Nice Sophia Antipolis, parc Valrose, 06108 Nice Cedex 2, France
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Abstract

Chromium-doped silica-based optical fibres emit infrared fluorescence at 77 K near 1250 nm (500 nm band-width) under 860−980 nm excitation. Visible and near-infrared absorption spectra of fibres were analysed using the Tanabe-Sugano formalism. It is shown that although the fibre core is codoped with only 1 mol% of aluminium, chromium is preferentially stabilized as Cr4+ in Al-rich regions of the glassy matrix in distorted tetrahedrally coordinated sites. The infrared fluorescence is assigned to Cr4+ along a transition from the 3T2 state down to the 3A2 ground state.

Keywords

Type
Research Article
Copyright
© EDP Sciences, 2000

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