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K: Fachverband Kurzzeitphysik

K 5: Laserstrahlwechselwirkung, Lasermaterialbearbeitung I

K 5.2: Vortrag

Mittwoch, 30. März 2011, 11:30–11:45, HS D

Long-Time Stability and Bleaching Behaviour of Fluorescent Defect Centres in fs-Laser-Written Waveguides — •Christian Vetter, Felix Dreisow, Matthias Heinrich, Stefan Nolte, and Andreas Tünnermann — Institute of Applied Physics, Friedrich-Schiller University Jena

The behaviour of fluorescent defect centres in fs-laser written waveguides has been studied using amorphous SiO₂ with a high content of silanol-groups as host material. A strong emission band at 650 nm originating from Non-Bridging Oxygen Hole Centres (NBOHCs) was used for direct fluorescence measurement.

We have studied the long-time stability (decay without additional illumination) and the bleaching behaviour (decay with illumination) of the sample and found multi-exponential decay-curves which indicate a complex system of chemical reactions. Additionally we measured a recovery mechanism which leads to the partial re-formation of NBOHCs after several hours.