Fractal kinetics of radiation-induced point-defect formation and decay in amorphous insulators: Application to color centers in silica-based optical fibers

2001 ◽  
Vol 64 (17) ◽  
Author(s):  
David L. Griscom
Keyword(s):  
Point Defect ◽  
Optical Fibers ◽  
Defect Formation ◽  
Color Centers ◽  
Fractal Kinetics ◽  
Radiation Induced ◽  
Kinetics Of

Radiation-Induced-Defects Localization in Single-Mode Optical Fibers

2005 ◽  
Vol 480-481 ◽  
pp. 329-332 ◽  
Author(s):  
Sylvain Girard ◽  
A. Boukenter ◽  
Y. Ouerdane ◽  
J.-P. Meunier
Keyword(s):  
Optical Fibers ◽  
Single Mode ◽  
Wavelength Dependence ◽  
Radiation Sensitivity ◽  
Color Centers ◽  
Strong Interactions ◽  
Radiation Induced ◽  
Different Color ◽  
Induced Defects

We studied the defects at the origins of the permanent radiation-induced attenuation in four g-rays irradiated single-mode germanosilicate optical fibers (~1 MeV; 1.2 kGy; 0.3 Gy/s) in the spectral range 400 - 1700 nm. We determined the wavelength dependence of the following cladding codopant influences: germanium (0.3 %), phosphorus (0.3 %), fluorine (0.3 %) on the germanosilicate (13 %) fiber radiation responses. We identified some of the different color centers produced by g-rays and we evaluated their localization in the fiber cross-section through the determination of the radial distribution of the radiation-induced absorption at 633 nm. We also evidenced the strong interactions between these three codopants. In particular, our results showed that the properties of the phosphorus-related color centers, which mainly determine the fiber infrared radiation sensitivity, are strongly influenced by the germanium- and fluorine-codoping.

Gamma and UV Radiation-Induced Color Centers in Optical Fibers

2005 ◽  
pp. 323-328 ◽  
Author(s):  
Sylvain Girard ◽  
E. Régnier ◽  
A. Boukenter ◽  
Y. Ouerdane ◽  
J.-P. Meunier ◽  
...  
Keyword(s):  
Uv Radiation ◽  
Optical Fibers ◽  
Color Centers ◽  
Radiation Induced

Effect of radiation-induced color centers absorption in optical fibers on fiber optic gyroscope for space application

2016 ◽  
Vol 25 (8) ◽  
pp. 084213
Author(s):  
Jing Jin ◽  
Ya Li ◽  
Zu-Chen Zhang ◽  
Chun-Xiao Wu ◽  
Ning-Fang Song
Keyword(s):  
Optical Fibers ◽  
Fiber Optic ◽  
Color Centers ◽  
Space Application ◽  
Fiber Optic Gyroscope ◽  
Radiation Induced

UV-Radiation Induced Color Centers in Optical Fibers

1985 ◽  
Vol 61 ◽  
Author(s):  
J. Simpson ◽  
J. Ritger ◽  
F. DiMarcello
Keyword(s):  
Oxygen Vacancy ◽  
Optical Fibers ◽  
Esr Spectra ◽  
Color Centers ◽  
Broad Absorption ◽  
Short Wavelength Range ◽  
Phosphorus Containing ◽  
Radiation Induced ◽  
Uv Dose ◽  
Induced Defects

ABSTRACTParamagnetic color centers have been observed in germanium silicate and germanium phosphosilicate multimode optical fiber exposed to broadband ultraviolet light (2–5 eV). These centers are characterized by an ESR and optical absorption similar to 1 meV and 100 keV radiation induced defects and show an apparent saturation as the UV dose approaches 100 J/cm2. The UV induced ESR spectra are not identical to that induced by 60Co radiation however, similar Ge(2) and Ge(3) germanium defect signatures are apparent. For both compositions these centers are characterized by a rapidly increasing loss from 1.0 to 0.5 µm with an additional broad absorption peak at 1.5 µm for the phosphorus containing cores. We suggest that the UV induced optical absorptions for both compositions in the short wavelength range are due in part to the Ge(2) germanium substitutional sites and expect that the 1.5 µm absorption is due to the P1 phosphorus oxygen vacancy.

Xenon ion irradiation of superconducting YBa2Cu3O7 thin films

1990 ◽  
Vol 48 (4) ◽  
pp. 92-93
Author(s):  
H. Watanabe ◽  
B. Kabius ◽  
B. Roas ◽  
K. Urban
Keyword(s):  
Defect Formation ◽  
Ion Irradiation ◽  
High Resolution Electron Microscopy ◽  
Structural Disorder ◽  
Flux Lines ◽  
Pinning Effect ◽  
Magnetic Flux Lines ◽  
Resolution Electron ◽  
Radiation Induced ◽  
Induced Defects

Recently it was reported that the critical current density(Jc) of YBa2Cu2O7, in the presence of magnetic field, is enhanced by ion irradiation. The enhancement is thought to be due to the pinning of the magnetic flux lines by radiation-induced defects or by structural disorder. The aim of the present study was to understand the fundamental mechanisms of the defect formation in association with the pinning effect in YBa2Cu3O7 by means of high-resolution electron microscopy(HRTEM).The YBa2Cu3O7 specimens were prepared by laser ablation in an insitu process. During deposition, a substrate temperature and oxygen atmosphere were kept at about 1073 K and 0.4 mbar, respectively. In this way high quality epitaxially films can be obtained with the caxis parallel to the <100 > SrTiO3 substrate normal. The specimens were irradiated at a temperature of 77 K with 173 MeV Xe ions up to a dose of 3.0 × 1016 m−2.

Energetics of point defect formation in Ni3Al

2002 ◽  
Vol 46 (1) ◽  
pp. 37-41 ◽  
Author(s):  
Hannes Schweiger ◽  
Olga Semenova ◽  
Walter Wolf ◽  
Wolfgang Püschl ◽  
Wolfgang Pfeiler ◽  
...  
Keyword(s):  
Point Defect ◽  
Defect Formation
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