Radiation-induced absorption and luminescence in specially hardened large-core silica optical fibers

Citation
Al. Tomashuk et al., Radiation-induced absorption and luminescence in specially hardened large-core silica optical fibers, IEEE NUCL S, 47(3), 2000, pp. 693-698
Citations number
13
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Nuclear Emgineering
Journal title
IEEE TRANSACTIONS ON NUCLEAR SCIENCE
ISSN journal
00189499 → ACNP
Volume
47
Issue
3
Year of publication
2000
Part
1
Pages
693 - 698
Database
ISI
SICI code
0018-9499(200006)47:3<693:RAALIS>2.0.ZU;2-X
Abstract
Radiation-induced absorption and luminescence are measured in the visible s pectral region in H-2-loaded and as-drawn fibers with KU and KS-4V silicas in the core in the process of gamma-irradiation (Co-60-source). The induced absorption in H-2-loaded fibers is shown to be much lower than in as-drawn fibers, at least up to 1.2 MGy. A 'blue' band prevails in the luminescence spectra of all the fibers. Its intensity is greater in a KS-4V fiber than in a KU fiber. It is also somewhat greater in H-2-loaded fibers than in unl oaded ones. The luminescence lifetime in a KU fiber has been measured under excitation with a pulsed reactor to be 100 mu s at lambda=488 nm and 60 mu s at lambda =633 nm. It is concluded that the 'blue' radioluminescence cannot be attrib uted either to relaxation of the oxygen-deficient center or to Cerenkov emi ssion. A fabrication technology of radiation-hardened H-2-containing fibers with a hermetic aluminum coating is reported. Such fibers appear to be the best c andidates for various applications in radiation environments.