SKM 2023 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 6: Poster
KFM 6.44: Poster
Dienstag, 28. März 2023, 17:00–19:00, P3
Optical damage and hologram recording in as-grown Lithium-Niobate-Tantalate solid solutions — •Sören Domke1, Bjoern Bourdon1, Steffen Ganschow2, and Mirco Imlau1 — 1Institute of Physics, Barbarastr. 7, Osnabrück Univ. — 2Leibniz-Institut für Kristallzüchtung (IKZ), Berlin
Lithium niobate tantalate (LNT, LiNbxTa1−xO3 with 0≤x≤1) solid solutions provide a promising material platform for nonlinear-photonics due to the ability for tuning the optical and electrical properties via composition. However, so far, very little is known about the (nonlinear) optical characteristics and intrinsic defect structure of LNT compared to its edge compositions lithium niobate (LN, x=1) and lithium tantalate (LT, x=0). In this respect, the presence of optical damage, i.e. the transient change of the index of refraction by the action of an incident light beam, is of particular importance as it drastically degrades the components’ usability, but can also be used for wave-mixing applications. Originally discovered in LN, we report of our observations of a comparable nonlinear optical phenomenon in nominally undoped LNT samples and present the results of our systematic studies using the recording and reconstruction of elementary holographic gratings. As a particular feature of our finding, the phenomenon shows a transient behavior with a lifetime in the order of tens of hours that can only be erased using white light illumination and/or thermal treatment. The results are discussed in the framework of the photorefractive effect and an intrinsic defect model. Financial support by the DFG (projects IM37/12-1, GA 2403/7-1, FOR 5044).