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

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

College of Engineering, Swansea University, Singleton Park, Swansea SA2 8PP, UK
Dipartimento di Scienza Applicata e Tecnologia (DISAT), Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino 10129, Italy
Perfos, R&D Platform of Photonics Bretagne, 11 rue Louis de Broglie, Lannion F-22300, France
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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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 (CC BY 3.0).

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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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