Berlin 2015 – wissenschaftliches Programm
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KR: Fachgruppe Kristallographie
KR 7: Optical and Nonlinear Optical Properties II (DF jointly with KR)
KR 7.4: Vortrag
Mittwoch, 18. März 2015, 15:40–16:00, EB 407
Multiphoton-induced luminescence and its domain contrast in Mg-doped LiNbO3 and LiTaO3 — •Philipp Reichenbach1, Thomas Kämpfe1, Andreas Thiessen1, Alexander Haussmann1, Robin Steudtner2, Theo Woike3, and Lukas M. Eng1 — 1Institut für Angewandte Photophysik, Technische Universität Dresden, George- Bähr-Str. 1, 01069 Dresden, Germany, 01069 Dresden, Germany — 2Institut für Ressourcenökologie, Helmholtz-Zentrum Dresden, Bautzner Landstraße 400, 01328 Dresden — 3Institut für Strukturphysik, Technische Universität Dresden, Zellescher Weg 16, 01069 Dresden, Germany
Mg doped LiNbO3 (LNO) and LiTaO3 (LTO) emit a spectrally broad multiphoton luminescence upon excitation with tightly-focused ultrashort laser pulses centered at 2.5 eV [1,2]. Time-resolved acquisition reveals a stretched exponential decay of the photoluminescence, which confirms the luminescence to stem from recombination of electron and hole polarons. Furthermore, the luminescence also shows a distinct contrast between virgin and single inverted domains of about 3% and 20 - 30% for LNO and LTO, respectively [2]. LNO exhibits the same contrast value when thermally pretreated at 1000∘C under oxygen atmosphere before poling. The contrast decays thermally-excited above 100∘C with an activation energy around 1 eV for both LNO and LTO. This indicates the contrast and its decay to be strongly connected to the lithium ion concentration and their activation.
[1] P. Reichenbach et al., J. Appl. Phys. 115, 213509 (2014)
[2] P. Reichenbach et al., Appl. Phys. Lett. 105, 122906 (2014)