Dresden 2026 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 12: Materials for the Storage and Conversion of Energy III / Functional Materials I
MM 12.9: Vortrag
Dienstag, 10. März 2026, 12:30–12:45, SCH/A216
Operando X-ray Absorption Spectroscopy studies of the X-ray exposed active and passive fiber preforms and their recovery properties upon UV-laser light — •Ali KARATUTLU1,2, Esra KENDIR TEKGÜL1, Iremnur DURU1,2, Timuçin Emre TABARU2, Latif Ullah KHAN3, Messaoud HARFOUCHE3, and Bülend ORTAÇ1 — 1Bilkent University, Institute of Materials Science Nanotechnology and National Nanotechnology Research Center (UNAM), Ankara, 06800 Turkey — 2Sivas University of Science and Technology, Department of Engineering Basic Sciences, Sivas, 58100 Turkey — 3Synchrotron-light for Experimental Science and Applications in the Middle East (SESAME), Allan, 19252, Jordan
In the development of active fiber preforms and active fibers containing rare-earth (RE) ions such as Yb+3 ions for 1-micron laser applications, the determination of the local environment around the Yb+3 ions is of paramount importance for their high optical-optical efficiency. In the long-term operation or when exposed to the gamma or X-ray exposures, the unwanted structural units are usually associated with the defects called color centers. This study demonstrates the formation of photodarkening upon gamma and X-ray exposures and operando X-ray absorption spectroscopy to determine the structural change around Yb+3 ions or Ge+4 ions with different doping levels before and after the irradiation of X-rays.
Keywords: Specialty optical fibers; Photodarkening; Recovery; gamma and X-rays; fiber laser