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Fibers 2013, 1(3), 101-109; doi:10.3390/fib1030101
Article

Photodarkening of Infrared Irradiated Yb3+-Doped Alumino-Silicate Glasses: Effect on UV Absorption Bands and Fluorescence Spectra

1
, 2,†,* , 1,†
, 3,†
, 3,†
, 2,†
, 2,†
 and 4,†
1 College of Engineering, Swansea University, Singleton Park, Swansea SA2 8PP, UK 2 Dipartimento di Scienza Applicata e Tecnologia (DISAT), Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino 10129, Italy 3 Perfos, R&D Platform of Photonics Bretagne, 11 rue Louis de Broglie, Lannion F-22300, France 4 XFiber S.A.S., Rue Paul Sabatier, Lannion F-22300, France These authors contributed equally to this work.
* Author to whom correspondence should be addressed.
Received: 30 October 2013 / Revised: 28 November 2013 / Accepted: 4 December 2013 / Published: 10 December 2013
(This article belongs to the Special Issue Advances on Optical Fibers)
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Abstract

The photodarkening phenomenon in alumino-silicate glass preforms, doped with different ytterbium concentrations, was studied. The UV band, comprised between 180 and 350 nm, was examined before and after irradiation at 976 nm. The non-linear dependence of 240 nm band with concentration after infra-red irradiation was demonstrated and ascribed predominantly to Yb3+ pair’s interaction. The emission spectrum after the excitation in UV spectral region showed increased intensity after photodarkening, probably due to Yb2+ ions creation. Phenomenological photodarkening model and the possible existence of several defect types are presented.
Keywords: photodarkening; Yb-doped fibers; high power lasers photodarkening; Yb-doped fibers; high power lasers
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Gebavi, H.; Milanese, D.; Taccheo, S.; Mechin, D.; Monteville, A.; Freyria, F.S.; Bonelli, B.; Robin, T. Photodarkening of Infrared Irradiated Yb3+-Doped Alumino-Silicate Glasses: Effect on UV Absorption Bands and Fluorescence Spectra. Fibers 2013, 1, 101-109.

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