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

Fibers

Hrvoje Gebavi²  Daniel Milanese³  Stefano Taccheo²  David Mechin¹  Achille Monteville¹  Francesca S. Freyria³  Barbara Bonelli³ 

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

关键词: photodarkening;    Yb-doped fibers;    high power lasers;   

DOI  :  10.3390/fib1030101

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.