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HL: Fachverband Halbleiterphysik

HL 61: Focus Session: Tailored Nonlinear Photonics I

HL 61.3: Vortrag

Donnerstag, 19. März 2020, 10:30–10:45, POT 51

Nonlinear optical susceptibility of potassium titanyl phosphate — •Agnieszka Kozub, Sergej Neufeld, Adriana Bocchini, Uwe Gerstmann, Arno Schindlmayr, and Wolf Gero Schmidt — Department Physik, Universität Paderborn, Paderborn, Germany

KTiOPO₄ (KTP) is a very important nonlinear optical material. Due to its high conversion efficiency, non-hygroscopicity, and cost-efficiency it is widely used for second harmonic generation (SHG). However, only very few experimental measurements on its SHG efficiency are available. In particular, its photon energy dependence has not been systematically studied. Previous theoretical works [1-3] focus mainly on the linear optical properties of KTP. Our present work aims at closing this gap.

Based on the Berry-phase formulation of the dynamical polarization [4] the second-order nonlinear optical susceptibility tensor χ⁽²⁾ is calculated and compared with the available experimental data. Particular attention is paid to the influence of non-stoichiometry and point defects on the KTP optical response.

[1] A. H. Reshak, I. V. Kityk, and S. Auluck, J. Phys. Chem. B 114, 16705 (2010).

[2] M. Ghoohestani, A. Arab, S. J. Hashemifar, and H. Sadeghi, J. Appl. Phys 123, 015702 (2018).

[3] S. Neufeld, A. Bocchini, U. Gerstmann, A. Schindlmayr, and W. G. Schmidt, J. Phys. Mater. 2, 045003 (2019).

[4] C. Attaccalite, M. Grüning, Phys. Rev. B 88, 235113(2013).