Preferred concentration enhancement of photobleachable defects responsible for 5 eV optical absorption band in SiO2:GeO2 glass preform by heating in a H2 atmosphere
- 26 July 1993
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 63 (4) , 479-481
- https://doi.org/10.1063/1.110782
Abstract
Heat treatment of a 5GeO2‐95SiO2 glass preform in a H2 atmosphere at 500 °C for 70 h increased intensities of an absorption band centered at 5 eV by a factor of ∼3. Intensities of photobleachable component, which is the precursor of UV‐induced Ge E’ centers and assigned to a neutral oxygen monovacancy, of the 5‐eV band were enhanced by a factor of ∼8 by heating. This increment is ∼3 times as large as that of UV‐unbleachable component, which is assigned to Ge2+ centers coordinated by two oxygens (neutral oxygen divacancy).Keywords
This publication has 15 references indexed in Scilit:
- Photosensitivity of solgel-derived germanosilicate planar waveguidesOptics Letters, 1993
- Constant fluorescence during phase grating formation and defect band bleaching in optical fibres under 5.1 eV laser exposureElectronics Letters, 1992
- Nature and origin of the 5-eV band in:glassesPhysical Review B, 1992
- Photoinduced grating and intensity dependence of defect generation in Ge-doped silica optical fiberApplied Physics Letters, 1992
- Correlation of defect centers with a wavelength-dependent photosensitive response in germania-doped silica optical fibersOptics Letters, 1991
- Correlation of defect centers with second-harmonic generation in Ge-doped and Ge–P-doped silica-core single-mode fibersOptics Letters, 1989
- Second-harmonic generation in optical glass fibersJournal of the Optical Society of America B, 1988
- Ultraviolet absorption studies of germanium silicate glassesApplied Optics, 1982
- Photosensitivity in optical fiber waveguides: Application to reflection filter fabricationApplied Physics Letters, 1978
- Neutron Specific Color Center in Fused Silica and an Impurity Band of Identical WavelengthPhysical Review B, 1957