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Vacuum ultraviolet absorption spectrum of photorefractive Sn-doped silica fiber preforms

Vacuum ultraviolet absorption spectrum of photorefractive Sn-doped silica fiber preforms
Vacuum ultraviolet absorption spectrum of photorefractive Sn-doped silica fiber preforms
Vacuum ultraviolet (VUV) absorption data have been obtained up to 8.3 eV on Sn-doped silica fibre preforms. Measurements have been carried out before and after exposure to 248 nm radiation from KrF excimer laser. The absorption spectrum is composed of three structures peaking at about 4.9, 5.8 and 7 eV, with the absorption edge at about 8.2 eV. The main effect of 5 eV 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. According to the observed negative absorption changes in the whole region of point-defect bands one would expect a negative refractive index change, contrary to the positive change previously reported in optical fibres of the same composition. Structural modifications accompanying the defect photoconversion process are suggested to be responsible for positive refractive index changes.
0022-3093
287-291
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
Paleari, A.
8f5681e9-6393-4a6a-b346-3905b72e9dbd
Scotti, R.
47f01a82-43af-4fec-9480-3cd32c9b3213
Spinolo, G.
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Brambilla, G.
815d9712-62c7-47d1-8860-9451a363a6c8
Pruneri, V.
0e97eb94-b682-409f-a107-ae6b84763f02
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
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., Paleari, A., Scotti, R., Spinolo, G., Brambilla, G. and Pruneri, V. (2001) Vacuum ultraviolet absorption spectrum of photorefractive Sn-doped silica fiber preforms. Journal of Non-Crystalline Solids, 280 (1-3), 287-291. (doi:10.1016/S0022-3093(00)00387-2).

Record type: Article

Abstract

Vacuum ultraviolet (VUV) absorption data have been obtained up to 8.3 eV on Sn-doped silica fibre preforms. Measurements have been carried out before and after exposure to 248 nm radiation from KrF excimer laser. The absorption spectrum is composed of three structures peaking at about 4.9, 5.8 and 7 eV, with the absorption edge at about 8.2 eV. The main effect of 5 eV 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. According to the observed negative absorption changes in the whole region of point-defect bands one would expect a negative refractive index change, contrary to the positive change previously reported in optical fibres of the same composition. Structural modifications accompanying the defect photoconversion process are suggested to be responsible for positive refractive index changes.

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Published date: 2001

Identifiers

Local EPrints ID: 13728
URI: https://eprints.soton.ac.uk/id/eprint/13728
ISSN: 0022-3093
PURE UUID: 6d723468-461a-4d9f-b5af-1d997ed428d8

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Date deposited: 10 Jan 2005
Last modified: 15 Jul 2019 19:34

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Contributors

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

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