Dresden 2014 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 2: Optical and nonlinear optical properties, photonic
DF 2.1: Vortrag
Montag, 31. März 2014, 10:30–10:50, GER 37
Domain contrast in photoluminescence at Mg doped LiNbO3 and LiTaO3 single crystals — •Philipp Reichenbach1, Thomas Kämpfe1, Andreas Thiessen1, Mathias Schröder1, Alexander Haußmann1, Theo Woike2, and Lukas M. Eng1 — 1Institut für Angewandte Photophysik, Technische Universität Dresden, George-Bähr-Str. 1, 01069 Dresden, Germany — 2Institut für Strukturphysik, Technische Universität Dresden, Zellescher Weg 16, 01069 Dresden, Germany
We investigated multiphoton photoluminescence (PL) occurring
in Mg doped LiNbO3 (LNO) and LiTaO3 (LTO) single crystals under a focused 100-fs laser beam at 790 nm. The PL signal always allows differentiating between switched domains and the virgin substrate due to the presence of a PL domain contrast of about 3% and 20% for the LNO and LTO substrates, respectively. This contrast shows a physical difference between original and switched state that originates from defect states
in the crystals.
When annealing the sample above 100∘C the domain contrast shows an exponential decay. Arrhenius plots of the decay times vs. the annealing temperatures show an activation energy of about 1 eV for both LNO and LTO. This value indicates that the contrast reduction is related with the motion of lithium or hydrogen within the crystal.