Eur. Phys. J. AP
Volume 11, Number 2, August 2000
|Page(s)||107 - 110|
|Published online||15 August 2000|
Cr4+-doped silica optical fibres: absorption and fluorescence properties
Laboratoire de Physique de la Matière Condensée (UMR CNRS UNSA 6622), Université de Nice Sophia Antipolis, parc
Valrose, 06108 Nice Cedex 2, France
Corresponding author: Bernard.Dussardier@unice.fr
Revised: 8 June 2000
Accepted: 20 June 2000
Published online: 15 August 2000
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.
PACS: 42.70.Hj – Laser materials / 32.70.-n – Intensities and shape of atomic spectral lines / 42.55.Wd – Fiber lasers
© EDP Sciences, 2000
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