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Hannover 2020 – scientific programme

The DPG Spring Meeting in Hannover had to be cancelled! Read more ...

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Q: Fachverband Quantenoptik und Photonik

Q 51: Quantum Optics IV

Q 51.8: Talk

Thursday, March 12, 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 Bartley11Mesoskopische 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.

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