Radiation damage of all-silica fibers in the UV region

Joerg Gombert; M. Ziegler; J. Assmus; Karl-Friedrich Klein; Gary W. Nelson; James P. Clarkin; H. Pross; J. Kiefer

doi:10.1117/12.346709

21 April 1999 Radiation damage of all-silica fibers in the UV region

Joerg Gombert, M. Ziegler, J. Assmus, Karl-Friedrich Klein, Gary W. Nelson, James P. Clarkin, H. Pross, J. Kiefer

Proceedings Volume 3596, Specialty Fiber Optics for Medical Applications; (1999) https://doi.org/10.1117/12.346709
Event: BiOS '99 International Biomedical Optics Symposium, 1999, San Jose, CA, United States

Abstract

Since several years, UVI-fibers having higher solarization- resistance are well known stimulating new fiber-optic applications in the UV-region below 250 nm. Besides the description of the improved transmission properties of UV- light from different UV-sources, the mechanisms of improvement have been discussed in detail. The UV-defects, mainly the E'- center with the UV-absorption band around 215 nm, were passivated by using hydrogen-doping. Besides DUV-light, ionizing radiation like Gamma-radiation or X-rays can create similar defects in the UV-region. In the past, the radiation- damage in the UV-region was studied on silica bulk samples: again, E'-centers were generated. Up to now, no UV- transmission through a 1 m long fiber during or after Gamma- radiation had been observed. However, the hydrogen in the UVI- fibers behaves the same for Gamma-irradiation, leading to a passivation of the radiation-induced defects and an improved transmission in the UV-C region below 250 nm. On this report, the influence of total dose and fiber diameter on the UV- damage after irradiation will be described and discussed. In addition, we will include annealing studies, with and without UV-light. Based on our results, the standard process of Gamma- sterilization with a total dose of approx. 2 Mrad can be used for UVI-fibers resulting in a good UV-transmission below 320 nm. Excimer-laser light at 308 nm (XeCl) and 248 nm (KrF) and deuterium-lamp light with the full spectrum starting at 200 nm can also be transmitted.

Citation Download Citation

Joerg Gombert, M. Ziegler, J. Assmus, Karl-Friedrich Klein, Gary W. Nelson, James P. Clarkin, H. Pross, and J. Kiefer "Radiation damage of all-silica fibers in the UV region", Proc. SPIE 3596, Specialty Fiber Optics for Medical Applications, (21 April 1999); https://doi.org/10.1117/12.346709

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