γ-Ray-induced visible/infrared optical absorption bands in pure and F-doped silica-core fibers: are they due to self-trapped holes?

Abstract Two optical fibers with high-purity, low-OH/low-Cl silica-cores, one F-doped and one not, were subjected to γ irradiation at 77 K and studied by transmission optical spectroscopy as functions of dose rate, dose, optical bleaching, ambient-temperature thermal fading, and isochronal annealing. Fractal-kinetic formalisms were used to elucidate and extrapolate the growth and decay kinetics of the induced optical absorption bands. It is shown that the isochronal annealing behaviors of bands peaking near 660 and 760 nm correlate with previously published electron-spin-resonance and electrical manifestations of self-trapped holes in amorphous silicon dioxide.

[1]  W. B. Fowler,et al.  Physics of color centers , 1968 .

[2]  David L. Griscom,et al.  Defects in SiO[2] and related dielectrics : science and technology , 2000 .

[3]  Raoul Kopelman,et al.  Fractal Reaction Kinetics , 1988, Science.

[4]  Friebele,et al.  Fundamental radiation-induced defect centers in synthetic fused silicas: Atomic chlorine, delocalized E' centers, and a triplet state. , 1986, Physical review. B, Condensed matter.

[5]  R. G. Leisure,et al.  Electron spin resonance identification of a methyl associated organic radical in irradiated amorphous SiO2 , 1996 .

[6]  David L. Griscom,et al.  Radiation hardening of pure-silica-core optical fibers: Reduction of induced absorption bands associated with self-trapped holes , 1997 .

[7]  D. Griscom.  Electron spin resonance characterization of self-trapped holes in amorphous silicon dioxide , 1992 .

[8]  David L. Griscom,et al.  Fractal kinetics of radiation-induced point-defect formation and decay in amorphous insulators: Application to color centers in silica-based optical fibers , 2001 .

[9]  S. Wang,et al.  Low−temperature irradiation effects in SiO2−insulated MIS devices , 1975 .

[10]  Y. Sasajima,et al.  Optical transitions of self-trapped holes in amorphousSiO2 , 2003 .

[11]  David L. Griscom,et al.  Thermal bleaching of x-ray-induced defect centers in high purity fused silica by diffusion of radiolytic molecular hydrogen , 1984 .

[12]  Tsai,et al.  Medium-range structural order and fractal annealing kinetics of radiolytic atomic hydrogen in high-purity silica. , 1989, Physical review. B, Condensed matter.

[13]  A. L. Tomashuk,et al.  γ-radiation resistance of aluminum-coated all-silica optical fibers fabricated using different types of silica in the core , 1996 .

[14]  D. Griscom.  Characterization of three E'-center variants in X- and γ-irradiated high purity a-SiO2 , 1984 .

[15]  David L. Griscom,et al.  γ and fission‐reactor radiation effects on the visible‐range transparency of aluminum‐jacketed, all‐silica optical fibers , 1996 .

[16]  Griscom.  Self-trapped holes in amorphous silicon dioxide. , 1989, Physical review. B, Condensed matter.

[17]  David L. Griscom,et al.  Optical Properties and Structure of Defects in Silica Glass , 1991 .

[18]  M. Decréton,et al.  Influence of the cladding thickness on the evolution of the NBOHC band in optical fibers exposed to gamma radiations , 1997 .

[19]  E. J. Friebele,et al.  ESR studies of damage processes in X‐irradiated high purity a‐SiO2:OH and characterization of the formyl radical defect , 1983 .