SKM 2023 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 14: Polar Oxide Crystals and Solid Solutions II

KFM 14.5: Vortrag

Donnerstag, 30. März 2023, 15:35–15:55, POT 106

Optical nonlinearities of lithium tantalate solid solutions — •Mirco Imlau, Tobias Hehemann, Sören Domke, Niklas Dömer, Fiete Breer, Felix Kodde, Jan Kleenen, Anton Pfannstiel, and Laura Vittadello — Institute of Physics, Osnabrück University

Optical nonlinearities of optical materials, i.e. the nonlinear material response to incident electromagnetic radiation, are the fundamental physical basis for a number of components in nonlinear photonics, such as nonlinear optical Kerr lenses, saturable absorbers or frequency converters. The properties of optical nonlinearities are closely related to the electronic and atomic structure of the material systems used. Against this background, lithium niobate tantalate (LNT, LiNb_xTa_1−xO₃ with 0≤x≤1) solid solutions are promising because the edge compounds themselves (LN, x=1 and LT, x=0) are already extensively used in photonics’ components, but especially because the nonlinear optical properties of LNT may be tailored to the specific requirements of the application via composition. We here present the state-of-the-art knowledge of our studies on optical nonlinearities of LNT over the entire composition range, both, for quasi-instantaneous nonlinear responses (absorption & nonlinear index, frequency conversion) and transient responses (time-resolved transient absorption on the temporal multiscale from femtoseconds to seconds & transient index dynamics). The findings are discussed in the framework of emerging applications in (nano-)photonics, particularly for laser systems of the next generation, and will be compared with LN and LT. Financial support by the DFG (project IM 37/12-1, FOR 5044).