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  • 1
    Electronic Resource
    Electronic Resource
    Transient electron paramagnetic resonance hydrogen hyperfine doublet in low-OH content synthetic silica optical fibers during isothermal annealing (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 1481-1483 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A transient 75 G electron paramagnetic resonance (EPR) hydrogen hyperfine doublet was observed for the first time in low-OH content silica optical fibers during isothermal annealing in the temperature range between 250 and 400 °C in air. The results are consistent with the diffusion of hydrogen molecules into the glass with subsequent interaction with E' centers to form an intermediate E'/H and, in turn, an EPR-inactive end product. The response of the doublet to trace amounts of hydrogen was used to monitor hydrogen diffusion and the reaction between E' and hydrogen in the glass.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.108665
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Nonuniform distribution of oxygen hole centers in silica optical fibers (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 3440-3442 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This letter reports spatially variant distributions of nonbridging oxygen hole centers (NBOHCs) in pure synthetic silica core optical fibers with fluorine doped silica claddings. Results of low-temperature x-band electron spin resonance (ESR) etchback measurements have established the presence of NBOHCs in increased concentration at the core-clad interfacial region. The observations on a low-OH content silica core fiber are contrasted with that on a high-OH fiber. The correlation between the ESR results and the spatially variant luminescent patterns observed in these fibers during excimer laser irradiation is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110139
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Electron paramagnetic resonance hyperfine spectrum of the Si E' defect associated with weakly bonded hydrogen molecules in synthetic silica optical fibers (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 66 (1995), S. 2816-2818 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Electron paramagnetic resonance (EPR) studies of low hydroxyl synthetic silica optical fibers have revealed the presence of a 13 G hyperfine splitting of the Si E' center which is associated with weakly bonded hydrogen molecules in the silica structure. The fibers were previously exposed to hydrogen at room temperature. During an annealing of the silica fibers at 100 °C in air, the 13 G doublet was observed to decline and disappear while the 74 G doublet and the Si E' signal were growing. The result correlates with the redistribution of hydrogen molecules and is relevant to the environmental aging that is encountered in fiber optical waveguides under certain conditions. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.113485
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Drawing-enhanced defect precursors in low-OH content, oxygen-deficient synthetic silica optical fibers (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 2090-2092 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The 74 and 13 G electron paramagnetic resonance hydrogen hyperfine doublets of the Si E' center were observed in low-OH content, oxygen-deficient silica optical fibers exposed to hydrogen at room temperature. These spectra were also found in hydrogen treated bulk samples but at negligible intensities compared to those in fiber samples. The significant enhancement of these doublets in the fiber samples indicates that the precursors of the 74 and 13 G hydrogen hyperfine doublets of Si E' are substantially produced in the fiber drawing process. Possible structures of the two precursors are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.111692
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  • 5
    Electronic Resource
    Electronic Resource
    Electron paramagnetic resonance characterization of nonuniform distribution of hydrogen in silica optical fibers (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 2131-2133 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The hydrogen distribution within low-OH silica optical fibers has been characterized by electron paramagnetic resonance in combination with a chemical etch-back technique. The 74 G doublet, the signal generated by a hydrogen hyperfine structure of the Si E′ center, was used to investigate the spatial distribution of hydrogen reaction products in silica optical fiber and, in particular, the reaction between the twofold coordinated silicon and hydrogen. A nonuniform distribution of the 74 G species was observed with the highest concentration near the fiber surface, indicative of a corresponding nonuniform distribution of hydrogen. The polymer fiber coating appears to be the primary source of the trace amounts of hydrogen observed in the silica fibers. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.117177
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