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Vacuum ultra-violet absorption spectrum of photorefractive Sn-doped silica fiber preforms

Vacuum ultra-violet absorption spectrum of photorefractive Sn-doped silica fiber preforms
Vacuum ultra-violet absorption spectrum of photorefractive Sn-doped silica fiber preforms
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.
Anedda, A.
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Carbonaro, C.M.
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Serpi, A.
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Chiodini, N.
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Morazzoni, F.
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Paleari, A.
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Scotti, R.
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Spinolo, G.
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Brambilla, G.
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Pruneri, V.
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Anedda, A.
05d639cf-c035-4312-9bee-4e6869205aa0
Carbonaro, C.M.
f8f1c18a-c9ab-445c-91fb-b2162c41c3d8
Serpi, A.
f597e016-d99d-450b-a6d9-fbeda246f28f
Chiodini, N.
d516f93d-7d8e-4033-b1be-b33ad58bf4f6
Morazzoni, F.
6df3211a-9ec3-4791-9b6f-f2afd4bf26f9
Paleari, A.
8f5681e9-6393-4a6a-b346-3905b72e9dbd
Scotti, R.
47f01a82-43af-4fec-9480-3cd32c9b3213
Spinolo, G.
59461e13-5670-463e-8031-81ddce53827a
Brambilla, G.
815d9712-62c7-47d1-8860-9451a363a6c8
Pruneri, V.
0e97eb94-b682-409f-a107-ae6b84763f02

Anedda, A., Carbonaro, C.M., Serpi, A., Chiodini, N., Morazzoni, F., Paleari, A., Scotti, R., Spinolo, G., Brambilla, G. and Pruneri, V. (2000) Vacuum ultra-violet absorption spectrum of photorefractive Sn-doped silica fiber preforms. 3rd Symposium SiO2 and Advanced Dielectrics. 19 - 21 Jun 2000.

Record type: Conference or Workshop Item (Paper)

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.

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Published date: 2000
Venue - Dates: 3rd Symposium SiO2 and Advanced Dielectrics, 2000-06-19 - 2000-06-21

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Local EPrints ID: 16952
URI: https://eprints.soton.ac.uk/id/eprint/16952
PURE UUID: dbff4a5d-ae14-4d3f-a666-b56eefbd699d

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Date deposited: 22 Aug 2005
Last modified: 17 Jul 2017 16:42

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Contributors

Author: A. Anedda
Author: C.M. Carbonaro
Author: A. Serpi
Author: N. Chiodini
Author: F. Morazzoni
Author: A. Paleari
Author: R. Scotti
Author: G. Spinolo
Author: G. Brambilla
Author: V. Pruneri

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