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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Paleari, A.
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Topics
Publications (12/12 displayed)
- 2023Effects of Al2O3 addition on microstructure and luminescence of transparent germanosilicate glass-ceramics with incorporated spinel Ga-oxide nanocrystalscitations
- 2022Silica glassceramics containing zinc oxides nanoparticles by solgel derived bottom-up approach
- 2013Structure of low-silica glasses in the K2O-Nb2O5-SiO2 systemcitations
- 2011Nano-heterogeneous structure of (1-x)KNbO 3 -xSiO 2 glasses in the low glass-forming oxide content range 0.05 ≤ x ≤ 0.3citations
- 2011Threaded molecular wires as building blocks for advanced polymer blends: WPLEDs, ultra-broadband optical amplifiers, multi color lasers
- 2003Optical spectroscopy of erbium and thulium doped SnO 2 :SiO 2 glass ceramics
- 2002Erbium doped nanostructured tin-silicate glass-ceramic compositescitations
- 2002Nonlinearity in poled tin-doped silica samples fabricated by sol-gel technique
- 2001Vacuum ultraviolet absorption spectrum of photorefractive Sn-doped silica fiber preformscitations
- 2000Photoinduced processes in Sn-doped silica fiber-preformscitations
- 2000Vacuum ultra-violet absorption spectrum of photorefractive Sn-doped silica fiber preforms
- 2000Magnetic investigation of Mn ions in La,Mn:SrTiO3citations
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document
Vacuum ultra-violet absorption spectrum of photorefractive Sn-doped silica fiber preforms
Abstract
Vacuum ultraviolet absorption data have been obtained up to 8.3 eV on Sn-doped silica preforms of optical fibres. Measurements have been carried out before and after exposure to 248 nm radiation from KrF excimer laser. The absorption spectrum is composed by three main structures peaked at about 4.9, 5.8 and 7 eV, with the absorption edge at about 8.2 eV. The main effect of irradiation is the decrease of the spectral components at 4.9 and 7 eV, whereas a small increase of absorption intensity is only observed just below the band at 4.9 eV. The results suggest that the photorefractivity of this material cannot be directly related to photoconversion of optically active defects. In fact, the contribution to the refractive-index change resulting from the absorption changes observed in the whole region of point-defect bands is negative, contrary to the positive change previously reported. The role of structural modifications - possibly accompanying the defect photoconversion process - is briefly discussed. <br/>