Radiation color center formation in silica glasses: a review of photo- and thermo-chemical aspects of the problem

Amossov, A.V.; Rybaltovsky, A A

doi:10.1016/0022-3093(94)90700-5

Cited by 27 publications

(17 citation statements)

References 13 publications

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“…cursors to the H(I) center [2] and possibly those to the center, which may be responsible for the 5.4-eV absorption observed in the RIA spectra in this work (Fig. 4).…”

Section: Ku-1 Ks-4vmentioning

confidence: 82%

“…(with absorption peaks near 5.4 eV), H(I) center [2] = -H (4) (maximum near 5.28 eV), and ODC-type defects (twofold-coordinated silicon and an oxygen vacancy) with a maximum near 5 eV (bands B 2 α , centered at 5.02 − 5.06 eV with FWHM = 0.35-0.38 eV, and B 2 β , centered at 5.15-5.16 eV with FWHM = 0.48 eV [17]). The 3.8-eV absorption is attributable to peroxy bonds and chlorine molecules [16].…”

Section: Ku-1 Ks-4vmentioning

confidence: 99%

“…4). The RIA band around 3.8 eV is attributable to the formation of chlorine molecules under gamma irradiation as a result of the breaking of ≡Si-Cl bonds [2] formed by reaction (6) during heat treatment.…”

Section: Ku-1 Ks-4vmentioning

confidence: 99%

“…Such dose levels impose stringent requirements for the radiation hardness of optical fibers, which can only be met using high-purity silica glasses, e.g., the Russian-made glasses KU-1 and KS-4V [1], as core materials. These glasses contain very low levels of impurities (chlorine, alkaline metals, and others), which are known to have an adverse effect on the radiation hardness of materials [2].…”

Section: Introductionmentioning

confidence: 99%

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Radiation-induced absorption in high-purity silica fiber preforms

et al. 2005

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The effect of the preform fabrication procedure on the radiation-induced absorption in KU-1 and KS-4V high-purity silica glasses was investigated (these glasses are used in fiber preform fabrication via outside fluorosilicate glass deposition on substrate rods and in the rod-in-tube process). The results demonstrate that the deposition of a reflective cladding onto KU-1 rods drastically increases the radiation-induced UV absorption of the rods. In particular, the concentrations of radiation-induced nonbridging oxygen hole centers and E ' centers in gamma-irradiated KU-1 rods with a fluorosilicate cladding are an order of magnitude higher than those in rods that were not heat-treated in plasma torch flames. At the same time, the deposition of a reflective cladding on KS-4V rods has little effect on the concentrations of these radiation-induced color centers. The radiation-induced absorption in KU-1 rods depends on the deposition temperature and duration but is insensitive to the composition of the gas mixture in the torch (in particular, to the presence of fluorination agents) and the presence of a fluorosilicate cladding. It is shown that, in preforms fabricated by the rod-in-tube process, the net concentration of radiation-induced color centers in the substrate rod is lower compared to the outside plasma deposition of fluorosilicate glass on the rod.

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“…cursors to the H(I) center [2] and possibly those to the center, which may be responsible for the 5.4-eV absorption observed in the RIA spectra in this work (Fig. 4).…”

Section: Ku-1 Ks-4vmentioning

confidence: 82%

Section: Ku-1 Ks-4vmentioning

confidence: 99%

Section: Ku-1 Ks-4vmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Radiation-induced absorption in high-purity silica fiber preforms

et al. 2005

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“…Color centers might be generated either by an electron missing from a normally occupied position, leading to a Bhole color-center,^or by the presence of one extra electron, which leads to an Belectron color-center.^They absorb in the visible region of the spectrum and are widely described in irradiated glasses (18,22). When the sample is heated, electrons and holes trapped into the defects recombine and the color disappears.…”

Section: Color Modificationmentioning

confidence: 99%