NDLI: Spectroscopic Study of <formula formulatype=inline><tex>$gamma$</tex> </formula>-Ray and Pulsed X-Ray Radiation-Induced Point Defects in Pure-Silica-Core Optical Fibers

Content Provider	IEEE Xplore Digital Library
Author	Girard, S. Ouerdane, Y. Vincent, B. Baggio, J. Medjahdi, K. Bisutti, J. Brichard, B. Boukenter, A. Boudrioua, A. Meunier, J.-P.
Copyright Year	1963
Abstract	We investigate the radiation-induced effects on pure-silica-core (PSC) optical fibers. For this, we measured the radiation-induced attenuation (RIA) growth and decay kinetics in four fibers with different hydroxyl and chorine contents. Our results show that PSC fibers exhibit different transient and continuous radiation responses depending of the silica-glass composition. Self-trapped charges [self-trapped excitons (STEs) and self-trapped holes (STHs)] seem mainly responsible for the fiber transient responses (times shorter than 1 s after the X-ray pulse) in the ultraviolet to near infrared part of the spectrum (300-900 nm). As these defects are unstable at room temperature, the contribution of other defects, like non-bridging oxygen hole centers (NBOHC) increases with time. Finally, these stable defects mainly explain the fiber permanent responses. To complete our online RIA measurements, we also studied by confocal microscopy luminescence (CML) the spatial distribution of the stable radiation-induced emitting centers in both pristine and irradiated fibers. Our CML results, obtained with 514 and 633 nm laser excitation, showed that several optically-active centers are non-uniformly generated in the fiber cross-sections. The generation of NBOHC by breakage of Si-O-Si strained bonds is clearly enhanced in high-OH fibers, especially at their core and cladding interfaces. The generation mechanisms of other unidentified defects emitting around 600 nm seem to be affected by both the hydroxyl content in the fiber core and by another factor that is not related to the silica glass composition.
Sponsorship	IEEE Nuclear and Plasma Sciences Society Computer Applications in Nuclear and Plasma Sciences (CANPS) Lawrence Berkeley Lab. Lawrence Livermore Nat. Lab. APS College of William and Mary Continuous Electron Beam Accelerator Facility NASA Defence Nuclear Agency Sandia National Laboratories Jet Propulsion Laboratory Brookhaven Nat. Lab. Lawrence Livermore Nat. Lab IEEE/NPPS Radiat. Effects Committee Defence Nuclear Agency/DoD Sandia National Laboratories/DOE Jet Propulsion Laboratory/NASA Phillips Lab./DoD
Starting Page	1136
Ending Page	1142
Page Count	7
File Size	949441
File Format	PDF
ISSN	00189499
Volume Number	54
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-08-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Spectroscopy Optical pulses Optical fibers Optical attenuators Attenuation measurement Kinetic theory Excitons Infrared spectra Temperature Microscopy radiation-induced effects Color centers confocal microscopy luminescence $\gamma$-rays optical fibers pulsed X-rays
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Electrical and Electronic Engineering Nuclear Energy and Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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