Electron paramagnetic resonance hyperfine spectrum of the Si E’ defect associated with weakly bonded hydrogen molecules in synthetic silica optical fibers

1995 ◽  
Vol 66 (21) ◽  
pp. 2816-2818 ◽  
Author(s):  
J. Li ◽  
S. Kannan ◽  
R. L. Lehman ◽  
G. H. Sigel
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Optical Fibers ◽  
Paramagnetic Resonance ◽  
Hydrogen Molecules ◽  
Electron Paramagnetic ◽  
Hyperfine Spectrum

Electron Paramagnetic Resonance and Optical Study of Radiation-Induced Defect Centers in Doped Silica Glasses

1985 ◽  
Vol 61 ◽  
Author(s):  
Robert N. Schwartz ◽  
Gregory L. Tangonan ◽  
G. Richard Blair ◽  
Walee Chamulitrat ◽  
Larry Kevan
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Radiation Dose ◽  
Optical Fibers ◽  
Optical Loss ◽  
Complex Spectrum ◽  
Epr Spectrum ◽  
Paramagnetic Resonance ◽  
Silica Glasses ◽  
Defect Centers ◽  
Electron Paramagnetic

ABSTRACTGamma- and UV-induced defect centers in germanium and fluorine doped silica have been studied by electron paramagnetic resonance (EPR) spectroscopy. The complex spectrum at g≃2 in γ-irradiated germanium doped glass corresponds to a superposition of resonances from several germanium E′-centers. In UV-irradiated samples, however, the EPR spectrum is dominated by only one type of germanium E′-centers. Significant spectral simplification of γ-irradiated germanium doped silica can be achieved by heating or broadband photoirradiation. Similar results are observed in multimode germanium doped core optical fibers. UV-induced optical loss spectra in the 0.5–1.5 μm wavelength range were also measured in these core fibers as well as the growth kinetics of the UL-induced absorption. Gamma-irradiation of fluorine doped silica generated two different types of silicon E′-centers, Ea1. At lower radiation dose one sees a mixture of Ea1 and Ea2, but at higher radiation dose Ea2 dominates. A spectrum dominated by the Ea2 variant is also observed in LW-irradiated samples and in photobleached low gamma dose samples.

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