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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 33, Iss. 6 — Feb. 20, 1994
  • pp: 1022–1028

Fast-neutron radiation effects in a silica-core optical fiber studied by a CCD-camera spectrometer

D. L. Griscom, M. E. Gingerich, E. J. Friebele, M. Putnam, and W. Unruh  »View Author Affiliations


Applied Optics, Vol. 33, Issue 6, pp. 1022-1028 (1994)
http://dx.doi.org/10.1364/AO.33.001022


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Abstract

A simple CCD-camera spectrometer was deployed at the Los Alamos Spallation Radiation Effects Facility to characterize fast-neutron irradiation effects in several silica-based optical fibers over the wavelength range ∼ 450–1100 nm. The experimental arrangement allowed optical loss spectra to be developed from remotely recovered frame grabs at various times during irradiation without it being necessary to resort to cutback methods. Data recorded for a pure-silica-core/F-doped-silica-clad fiber displayed a peculiar artifact, which is described and mathematically modeled in terms of leaky modes propagating in an optical cladding that is substantially less susceptible to radiation-induced optical attenuation than is the core. Evidence from optical time-domain reflectometry supports the postulate that mode leakage into the cladding may be a result of light scattering from the tracks of ions displaced by the 14-MeV neutrons. These results suggest that fibers with fluorine doping in the core, as well as in the cladding, would be relatively resistant to radiation-induced attenuation in the UV–visible spectral region.

© 1994 Optical Society of America

History
Original Manuscript: February 26, 1993
Revised Manuscript: September 2, 1993
Published: February 20, 1994

Citation
D. L. Griscom, M. E. Gingerich, E. J. Friebele, M. Putnam, and W. Unruh, "Fast-neutron radiation effects in a silica-core optical fiber studied by a CCD-camera spectrometer," Appl. Opt. 33, 1022-1028 (1994)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-33-6-1022

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