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1 August 1991 Photosensitive germanosilicate preforms and fibers
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Proceedings Volume 1513, Glasses for Optoelectronics II; (1991)
Event: ECO4 (The Hague '91), 1991, The Hague, Netherlands
A detailed study of the ultraviolet loss spectra of germanosilicate preforms and fibers is reported. The fiber samples had peak losses of the order of 10 dB/cm, which was several orders of magnitude lower than in preform samples. All spectra could be described by a number of previously observed absorption bands, many of which had been associated with particular defects in germanosilicate glasses. The incorporation of phosphorous as a core codopant eliminated a loss band centered at 325 nm in as drawn fibers. The effect on the ultraviolet absorption spectra of increasing doses of irradiation from an ultraviolet fiber- coating curing-lamp source and also the change in fiber absorption before and after writing a 35% reflection grating are presented. The results are not consistent with the previously proposed model for photosensitivity based on the Kramers-Kronig mechanism.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Doug L. Williams, Steven T. Davey, Raman Kashyap, J. R. Armitage, and B. James Ainslie "Photosensitive germanosilicate preforms and fibers", Proc. SPIE 1513, Glasses for Optoelectronics II, (1 August 1991);

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