| Autor: |
Hrvoje Gebavi, Daniel Milanese, Stefano Taccheo, David Mechin, Achille Monteville, Francesca S. Freyria, Barbara Bonelli, Thierry Robin |
| Jazyk: |
angličtina |
| Rok vydání: |
2013 |
| Předmět: |
|
| Zdroj: |
Fibers, Vol 1, Iss 3, Pp 101-109 (2013) |
| Druh dokumentu: |
article |
| ISSN: |
2079-6439 |
| DOI: |
10.3390/fib1030101 |
| Popis: |
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. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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