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Enhanced photosensitivity in germanosilicate fibres exposed to CO2 laser radiation

Enhanced photosensitivity in germanosilicate fibres exposed to CO2 laser radiation
Enhanced photosensitivity in germanosilicate fibres exposed to CO2 laser radiation
We report a novel method to increase the UV photosensitivity of GeO2:SiO2 optical fibers based on exposure to CO2 laser irradiation before grating writing. Fibers treated with a CO2 laser can produce gratings with refractive-index modulation two times greater and a Bragg wavelength that can be 2 nm longer than those of untreated fibers. Experiments on GeO2:SiO2 preform samples treated with a CO2 laser in a way similar to the fibers showed a marked increase of the 242 nm absorption band, which is associated with an increase of germanium oxygen-deficient centers and is believed to be responsible for the higher photorefractive response.
0146-9592
1023-1025
Brambilla, G.
815d9712-62c7-47d1-8860-9451a363a6c8
Pruneri, V.
0e97eb94-b682-409f-a107-ae6b84763f02
Reekie, L.
ec314137-6924-44ad-86a4-ff3f9a67c1b5
Payne, D.N.
4f592b24-707f-456e-b2c6-8a6f750e296d
Brambilla, G.
815d9712-62c7-47d1-8860-9451a363a6c8
Pruneri, V.
0e97eb94-b682-409f-a107-ae6b84763f02
Reekie, L.
ec314137-6924-44ad-86a4-ff3f9a67c1b5
Payne, D.N.
4f592b24-707f-456e-b2c6-8a6f750e296d

Brambilla, G., Pruneri, V., Reekie, L. and Payne, D.N. (1999) Enhanced photosensitivity in germanosilicate fibres exposed to CO2 laser radiation. Optics Letters, 24 (15), 1023-1025. (doi:10.1364/OL.24.001023).

Record type: Article

Abstract

We report a novel method to increase the UV photosensitivity of GeO2:SiO2 optical fibers based on exposure to CO2 laser irradiation before grating writing. Fibers treated with a CO2 laser can produce gratings with refractive-index modulation two times greater and a Bragg wavelength that can be 2 nm longer than those of untreated fibers. Experiments on GeO2:SiO2 preform samples treated with a CO2 laser in a way similar to the fibers showed a marked increase of the 242 nm absorption band, which is associated with an increase of germanium oxygen-deficient centers and is believed to be responsible for the higher photorefractive response.

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Published date: 1999

Identifiers

Local EPrints ID: 77811
URI: http://eprints.soton.ac.uk/id/eprint/77811
ISSN: 0146-9592
PURE UUID: 87504ee8-a8d1-4097-951b-1930784975a0

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Date deposited: 11 Mar 2010
Last modified: 23 Sep 2019 19:12

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