Radiation effects on pure silica core optical fibers by γ-rays: relation between 2 eV band and non-bridging oxygen hole centers

The defect center causing the 2 eV absorption band induced in pure silica core fibers by 60 Co γ-rays is discussed. The 2 eV band and non-bridging oxygen hole center (NBOHC, SI–O·) show almost the same thermal annealing characteristics. The peak wavelength of the 2 eV band in low-OH (≦6 ppm) fibers...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 1986-03, Vol.25 (3), p.464-468
Main Authors: NAGASAWA, K, HOSHI, Y, OHKI, Y, YAHAGI, K
Format: Article
Language:English
Subjects:
Applied sciences
Circuit properties
Electric, optical and optoelectronic circuits
Electronics
Exact sciences and technology
Integrated optics. Optical fibers and wave guides
Optical and optoelectronic circuits
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Summary:The defect center causing the 2 eV absorption band induced in pure silica core fibers by 60 Co γ-rays is discussed. The 2 eV band and non-bridging oxygen hole center (NBOHC, SI–O·) show almost the same thermal annealing characteristics. The peak wavelength of the 2 eV band in low-OH (≦6 ppm) fibers is 630 nm, but shifts to shorter wavelengths according to the amount of OH group the sample contains, and appears at 600 nm in high-OH (≧700 ppm) fibers. The peak shape is broader in high-OH fibers than in low-OH fibers. This shift and broadening is attributable to a hydrogen bond between NBOHC and a hydrogen atom. Based on the above results, the defect center responsible for the 2 eV band is considered to be NBOHC.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.25.464