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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 14: Poster

KFM 14.12: Poster

Mittwoch, 19. März 2025, 17:00–18:30, P1

Refractive Indices and Birefringence Behavior of Lithium Niobate Tantalate Solid Solutions — •Tobias Hehemann¹, Anton Pfannstiel¹, Steffen Ganschow², and Mirco Imlau¹ — ¹Institute of Physics, Osnabrueck University — ²Leibniz-Institut für Kristallzüchtung, IKZ, Berlin

Lithium niobate tantalate solid solutions (LNT, LiNb_1−xTa_xO₃ with 0 ≤ x ≤ 1) exhibit a wide range of linear and nonlinear optical properties, that can be tuned by composition x. A unique feature is the disappearance of the birefringence Δn for x between 0.93≤ x≤ 0.96 [Wood et al., J. Phys.: Condens. Matter 20 235237 (2008)] enabling customized applications in photonics. While the dispersive behavior of the ordinary n_o(λ) and extra-ordinary n_e(λ) indices are well documented for the edge compositions LiNbO₃ (LN, x=0) and LiTaO₃ (LT, x=1), there remains a lack for LNT along x. In particular, nearly nothing is known about the structural relation between the index of refraction and composition. We here present our results for the dispersion behavior of n_o and n_e of LNT for several x, measured using an interferometric technique at specific wavelengths in the visible spectrum. Our data allow for a more detailed inspection of the birefringence Δ n = n_o−n_e of LNT at room temperature. The obtained data are analyzed and discussed in the context of existing literature, providing deeper insights into the relation between structure and optical properties of LNT. Funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) – Project-ID 426703838 (IM 37/13-1, GA 2403/7-1 of the FOR 5044).

Keywords: Lithium Niobate; Lithium Tantalate; Refractive Index; Birefringence; Sellmeier equations