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

Issue		Eur. Phys. J. Appl. Phys. Volume 11, Number 2, August 2000


Page(s)		107 - 110
DOI		10.1051/epjap:2000151

DOI: 10.1051/epjap:2000151

Eur. Phys. J. AP 11, 107-110

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

V. Felice - B. Dussardier¹ - J.K. Jones - G. Monnom - D.B. Ostrowsky

Laboratoire de Physique de la Matière Condensée, Université de Nice Sophia Antipolis, parc Valrose, 06108 Nice Cedex 2, France
Bernard.Dussardier@unice.fr

Received: 22 December 1999 / Revised: 08 June 2000 / Accepted: 20 June 2000

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.

PACS
42.70.Hj Laser materials - 32.70.-n Intensities and shape of atomic spectral lines -
42.55.Wd Fiber lasers

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