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Interstitial-fluoride and substitutional-oxygen charge compensations of Er3+ doped in CaF2 crystal

Published online by Cambridge University Press:  15 November 2000

A. Chehaidar  and
L. Hirsch
A. Chehaidar*
Affiliation:
Groupe de Physique Théorique, Département de Physique, Faculté des Sciences de Sfax, 3018 Sfax, Tunisia
L. Hirsch
Affiliation:
LEMME, Université de Bordeaux 1, 351 cours de la Libération, 33405 Talence Cedex, France
*
[email protected]
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Abstract

A detailed crystal-field analysis, based on the Racah' theory, was carried out for the so-called A, B and G1 isolated charge-compensation centers of Er3+ ion doped in CaF2 crystal. Three sets of crystal-field parameters were obtained by a least-squares fitting of the optical data of Er3+ ion diluted in epitaxial Ca1−xErxF2+x thin film. This theoretical analysis confirms the expected $C_{4\nu}$ site symmetry for the A center and the $C_{3\nu}$ site symmetry for the G1 center. For the B center, however, the site symmetry is not exactly $C_{3\nu}$ in contrast to what is believed.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 12 , Issue 2 , November 2000 , pp. 79 - 83
Copyright
© EDP Sciences, 2000

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