Ultraviolet absorption in modified chemical vapor deposition preforms
Ultraviolet absorption in modified chemical vapor deposition preforms
Using a simple and effective technique, we have systematically studied the UV absorption in a number of fiber preforms made by modified chemical vapor deposition. The 242-nm absorption band due to germanium-related oxygen-deficient centers (GODC's) is found to be approximately linearly dependent on germania concentration and, for a small initial increase, is almost constant throughout the preform collapse process. However, we found that the band can be increased by 700% when a reducing atmosphere (He + 1%D2) is substituted for O2. Several codopants have been evaluated to determine their effect on the GODC concentration. Phosphorus, boron, aluminum, and fluorine all reduce the 242-nm band; phosphorus causes the largest change.
2106-2111
Dong, L.
4a30a247-d676-42ef-aaf4-061579d6d64e
Pinkstone, J.
0971e569-7589-4e7d-aa98-f500fd07ab0b
Russell, P.St.J.
77db5e8d-8223-4806-ae60-a106619a022a
Payne, D.N.
4f592b24-707f-456e-b2c6-8a6f750e296d
1994
Dong, L.
4a30a247-d676-42ef-aaf4-061579d6d64e
Pinkstone, J.
0971e569-7589-4e7d-aa98-f500fd07ab0b
Russell, P.St.J.
77db5e8d-8223-4806-ae60-a106619a022a
Payne, D.N.
4f592b24-707f-456e-b2c6-8a6f750e296d
Dong, L., Pinkstone, J., Russell, P.St.J. and Payne, D.N.
(1994)
Ultraviolet absorption in modified chemical vapor deposition preforms.
Journal of the Optical Society of America B, 11 (10), .
(doi:10.1364/JOSAA.11.002106).
Abstract
Using a simple and effective technique, we have systematically studied the UV absorption in a number of fiber preforms made by modified chemical vapor deposition. The 242-nm absorption band due to germanium-related oxygen-deficient centers (GODC's) is found to be approximately linearly dependent on germania concentration and, for a small initial increase, is almost constant throughout the preform collapse process. However, we found that the band can be increased by 700% when a reducing atmosphere (He + 1%D2) is substituted for O2. Several codopants have been evaluated to determine their effect on the GODC concentration. Phosphorus, boron, aluminum, and fluorine all reduce the 242-nm band; phosphorus causes the largest change.
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Published date: 1994
Identifiers
Local EPrints ID: 78213
URI: http://eprints.soton.ac.uk/id/eprint/78213
ISSN: 0740-3224
PURE UUID: 775e507c-c783-426a-9f10-ad1afcc4591c
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Date deposited: 11 Mar 2010
Last modified: 14 Mar 2024 00:09
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Author:
L. Dong
Author:
J. Pinkstone
Author:
P.St.J. Russell
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