Ultraviolet absorption in modified chemical vapor deposition preforms
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, 11, (10), 2106-2111. (doi:10.1364/JOSAA.11.002106).
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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.
|Subjects:||Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
|Divisions:||University Structure - Pre August 2011 > Optoelectronics Research Centre
|Date Deposited:||11 Mar 2010|
|Last Modified:||27 Mar 2014 18:58|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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