Formation mechanisms of precursors of radiation-induced color centers during fabrication of silica optical fiber preform

Journal Article · Fri Apr 15 00:00:00 EDT 2011 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3561435· OSTI ID:21560161

Tomashuk, A L; Zabezhailov, M O ^[1]

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1. Fiber Optics Research Center of the Russian Academy of Sciences, 38 Vavilov Street, 119333 Moscow (Russian Federation)

Samples in the form of transverse slices of rods and optical fiber preforms made from the high-hydroxyl KU-1 and low-hydroxyl KS-4V silica by the plasma outside deposition (POD) method are {gamma}-irradiated to a dose of {approx}1 MGy (SiO{sub 2}). Next, the radial dependences of the radiation-induced nonbridging oxygen hole center (NBOHC) and E'-center (three-coordinated silicon) in the samples are constructed by measuring the amplitudes of their 4.8 and 5.8 eV absorption bands, respectively. Based on the analysis of these radial dependences and considering the temperature and duration of the preirradiation heat treatment of the rods and preforms at the POD-installation, we determine the ratio of the oscillator strengths of the above bands and the microscopic thermoinduced processes occurring during preform fabrication and producing precursors of the radiation-induced NBOHC and E'-center. These processes are found to be associated with the escape of either H{sub 2} or H{sub 2}O from neighboring hydroxyl groups, and, therefore, can occur in high-hydroxyl silica only. It is concluded that enhancement of the radiation resistance of high-hydroxyl silica optical fibers requires decreasing the temperature and duration of the preform fabrication process, in particular, changing from the POD-technology to the low-temperature plasmachemical vapor deposition (PCVD) or surface PCVD (SPCVD)-technology.

• OSTI ID: 21560161
• Journal Information: Journal of Applied Physics, Vol. 109, Issue 8; Other Information: DOI: 10.1063/1.3561435; (c) 2011 American Institute of Physics; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION
AMPLITUDES
DEPOSITION
E CENTERS
FABRICATION
GAMMA RADIATION
HEAT TREATMENTS
HYDROGEN
HYDROXIDES
INSTALLATION
OPTICAL FIBERS
OSCILLATOR STRENGTHS
OXYGEN
PLASMA
SILICA
SILICON
SILICON OXIDES
SURFACES
CHALCOGENIDES
COLOR CENTERS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
ELECTROMAGNETIC RADIATION
ELEMENTS
FIBERS
HYDROGEN COMPOUNDS
IONIZING RADIATIONS
MINERALS
NONMETALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
POINT DEFECTS
RADIATIONS
SEMIMETALS
SILICON COMPOUNDS
SORPTION
VACANCIES