Dresden 2026 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 16: Functional Materials II

MM 16.1: Talk

Tuesday, March 10, 2026, 14:00–14:15, SCH/A216

Low and High Dose Gamma Radiation Effect on Germanium-Doped Optical Fibers: Investigation of Color Centers — •Esra Kendir Tekgül — Bilkent University UNAM, Institute of Materials Science and Nanotechnology, Ankara, 06800, TURKEY

Ge-doped optical fibers are widely used in sensing, data transmission, and space technologies, making their radiation resistance crucial. Gamma irradiation creates radiation-induced defects that form color centers, degrading optical transmission. In this study, five Ge-doped fibers and one quartz fiber were exposed to gamma rays of 0.5-50 kGy. RIA values at 550, 600, 680, and 755 nm were measured before and after irradiation, and color centers were identified from the RIA spectra. GeX, Ge-NBOHC, and GeY defects were attributed to Ge contributions, whereas ODC(II), STH1, and STH2 were attributed to the SiO2 matrix. NA and FTIR results showed radiation-induced changes in refractive index and a decrease in NA. Overall, the findings highlight the potential of Ge-doped fibers for radiation-hard applications and dosimetric sensing.

Keywords: Ge doped fiber; Color center; Ge and Si elements; Defects; Gamma Radiation