Berlin 2008 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 9: Poster

DF 9.12: Poster

Dienstag, 26. Februar 2008, 15:00–18:00, Poster G

Topographic investigations of LiB₃O₅-crystal surface degradations generated at reduced and normal pressure — Stefan Möller, •Änne Andresen, and Mirco Imlau — Department of Physics, University of Osnabrück, D-49069 Osnabrück

We have investigated the degradation of LiB₃O₅-crystal surfaces during long-term irradiation with intense laser light of λ = 355 nm, λ = 532 nm, or λ = 1064 nm wavelength, and different repetition rates up to 100 kHz as well as cw-light. The topographic analysis of the surfaces were performed with low-coherence and atomic-force microscopy. At reduced pressure a catastrophic degradation of the surface was already observed upon irradiation with green light, whereas at normal pressure UV-radiation was necessary for the generation of surface degradation. The surface degradation emerge faster upon increase of the light intensity. A model for the generation of the observed surface degradations related to thermal damage will be presented. The general applicability of low-coherence microscopy as a method to analyze light-induced degradations of LiB₃O₅-crystal surfaces is considered. Financial support by the DFG (TFB 13, project A5/13-04).