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MM: Fachverband Metall- und Materialphysik

MM 9: Poster

MM 9.47: Poster

Montag, 17. März 2025, 18:30–20:30, P1

Rapid photobleaching of Yb-doped optical fibers exposed to gamma radiation by high energy ns pulsed laser — •Esra Kendir Tekgül and Bülend Ortaç — Bilkent University UNAM, Institute of Materials Science and Nanotechnology, Ankara, 06800, TURKEY

Rare earth-doped optical fibers (OFs) have become one of the new high-power laser and sensor applications. Therefore, it is very important to protect such OFs from being exposed to external effects and to increase their reusability after these effects. Here, Radiation Induced Attenuation (RIA) and the Photo-darkening (PD) processes play an important role. The main source of the problem is the color centers formed in the OF. Preventing or recovering these formations before and after the production of OF is of great importance in both efficient and long-lasting systems.

To determine the behavior of Yb-doped OF, they are exposed to gamma radiation or PD. The important recovery process is photobleaching (PB) for defects due to the gamma radiation. In our study, a rapid and efficient PB process was achieved using a high-energy nanosecond pulse to recover existing and/or revealed color centers in OF that had been irradiated with 10 kGy of gamma radiation. The PB process was analyzed based on the wavelength and energy of the pulsed light source. The highest level was achieved with the 532 nm wavelength laser. The findings indicate that the recovery of color centers can reach up to 96% in a shorter duration (hours) compared to results from studies utilizing continuous lasers.

Keywords: Yb-doped optical fiber; Photobleaching; Color Center; Defects; Gamma Radiation