Hannover 2016 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 42: Poster: Quantum Optics and Photonics III

Q 42.64: Poster

Wednesday, March 2, 2016, 16:30–19:00, Empore Lichthof

Duty cycle optimized periodically poled Rb:KTP waveguides — •Laura Padberg, Christof Eigner, Matteo Santandrea, Helge Rütz, and Christine Silberhorn — Universität Paderborn, Integrierte Quantenoptik, Warburger Str. 100, D-33098 Paderborn

Periodically poled potassium titanyle phosphate (KTP) waveguides are very attractive for non-linear processes in integrated quantum optics. Especially the high optical damage threshold makes it interesting for operating in the visible.

Rubidium-potassium-ion exchange is a practical approach for waveguide fabrication in KTP. However, the doping dependent ionic conductivity of Rb:KTP makes periodic poling a challenging task.

We show our approach for the technologically-challenging periodic poling process, where we utilize an optical monitoring technique. This allows us to monitor the domain-growth inside the waveguide and obtain a reliable 50/50 duty cycle. Successful periodic poling is verified by selective surface etching as well as non-linear optical characterization measurement. With these characterization methods we compare two different poling periods which are attractive for quantum optical applications.