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Q: Fachverband Quantenoptik und Photonik

Q 57: Poster: Quantum Optics and Photonics III

Q 57.39: Poster

Donnerstag, 14. März 2019, 16:15–18:15, S Fobau Physik

Towards Cryogenic Polarisation Modulation in Lithium Niobate Waveguides — •Frederik Thiele, Jan Philipp Höpker, Patrick Bartowiak, Felix vom Bruch, Harald Herrmann, Raimund Ricken, Viktor Quiring, Christine Silberhorn, and Tim J. Bartley — Universität Paderborn, Warburger Straße 100, 33098 Paderborn, Germany

Lithium niobate is an important platform for integrated optics given its high second-order nonlinearity and electro-optic properties. In this material are high-speed electro-optic modulation and polarization conversion can be realised. Superconducting detectors and other quantum optic devices are operated at cryogenic temperatures. The aim of this work is to implement modulators at cryogenic temperatures in order to achieve high system efficiencies from the source through the modulators to the detectors. We report on the progress towards this goal. High coupling efficiency from single mode fibres from room temperature to cryogenic temperatures have been realised. Periodically poled polarization modulators in titanium in-diffused lithium niobate waveguides are dependent on quasi-phase matching and need to be adapted for cryogenic temperatures. The expected change in the poling period can be extrapolated from previously determined refractive indices of lithium niobate.