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Regeneration of irradiated optical fibres by photobleaching?

: Henschel, H.; Köhn, O.

Postprint urn:nbn:de:0011-n-41137 (581 KByte PDF)
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Created on: 25.9.2010

Sharp, R.:
Fifth European Conference on Radiation and Its Effects on Components and Systems, RADECS '99
Piscataway, NJ: IEEE, 2000
ISBN: 0-7803-5726-4
European Conference on Radiation and its Effects on Components and Systems (RADECS) <5, 1999, Abbaye de Fontevraud>
Conference Paper, Electronic Publication
Fraunhofer INT ()
gamma-ray effect; optical fibre loss; optical saturable absorption; gamma irradiation; optical fibre regeneration; photobleaching; nuclear reactor; particle accelerator; radiation induced loss; laser light injection; silica core fibre; Ge-doped fibre

Optical fibres that are permanently installed in nuclear reactors (fission or fusion) or at high energy physics accelerators can accumulate considerable long-lived radiation-induced loss. Four different fibre types were irradiated up to dose values from 10/sup 3/ to 10/sup 6/ Gy and an attempt was made to reduce the residual loss >or=28 h after the end of irradiation by injection of high intensity laser light (40-100 mW) of 672, 830 and 980 nm wavelength. The radiation-induced loss of undoped silica core fibres could not be reduced by photobleaching, whereas the loss of Ge-doped fibres could only be reduced after lower dose values and in the wavelength region of lowest loss increase (800-1200 nm) where it is tolerable anyhow.