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Q: Fachverband Quantenoptik und Photonik
Q 51: Quantum Optics IV
Q 51.8: Vortrag
Donnerstag, 12. März 2020, 15:45–16:00, f342
Second Harmonic Generation at Cryogenic Temperatures in Lithium Niobate Waveguides — •Nina Amelie Lange1, Moritz Bartnick1, Jan Philipp Höpker1, Frederik Thiele1, Raimund Ricken2, Viktor Quiring2, Christof Eigner2, Harald Herrmann2, Christine Silberhorn2, and Tim Bartley1 — 1Mesoskopische Quantenoptik, Department Physik, Universität Paderborn, Warburger Straße 100, 33098 Paderborn, Germany — 2Integrierte Quantenoptik, Department Physik, Universität Paderborn, Warburger Straße 100, 33098 Paderborn, Germany
Waveguides in lithium niobate have shown extensive functionality in quantum photonics. Their high second-order nonlinearity and electro-optic properties make them ideal for nonlinear processes and active manipulation of quantum optical states. These properties are well-known under ambient conditions; however, to be compatible with other photonic technologies such as single photon emitters and superconducting detectors, optimisation at cryogenic temperatures is required. We demonstrate second harmonic generation (SHG) down to a temperature of 4K, using a robust fibre-pigtailing procedure, a narrowband tuneable pump laser and a closed-cycle cryostat. We analyse the role of the temperature change on the phasematched wavelength, and investigate various dynamics across different timescales, which indicate the appearance of pyroelectric fields.