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Proceedings Article

Radiation damage of all-silica fibers in the UV region

[+] Author Affiliations
Joerg Gombert, M. Ziegler, J. Assmus, Karl-Friedrich Klein

Fachhochschule Giessen-Friedberg (Germany)

Gary W. Nelson, James P. Clarkin

Polymicro Technologies Inc. (USA)

H. Pross, J. Kiefer

Justus-Liebig-Univ. Giessen (USA)

Proc. SPIE 3596, Specialty Fiber Optics for Medical Applications, 124 (April 21, 1999); doi:10.1117/12.346709
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From Conference Volume 3596

  • Specialty Fiber Optics for Medical Applications
  • Abraham Katzir; James A. Harrington
  • San Jose, CA | January 23, 1999

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.

© (1999) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Joerg Gombert ; M. Ziegler ; J. Assmus ; Karl-Friedrich Klein ; Gary W. Nelson, et al.
"Radiation damage of all-silica fibers in the UV region", Proc. SPIE 3596, Specialty Fiber Optics for Medical Applications, 124 (April 21, 1999); doi:10.1117/12.346709; http://dx.doi.org/10.1117/12.346709


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