Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 42: Poster: Quantum Optics and Photonics III
Q 42.63: Poster
Mittwoch, 2. März 2016, 16:30–19:00, Empore Lichthof
Modelling and fabrication of Rb:KTP waveguides — •Matteo Santandrea, Christof Eigner, Laura Padberg, Helge Rütz, and Christine Silberhorn — Universität Paderborn, Integrierte Quantenoptik, Warburger Str. 100, D-33098 Paderborn
In the future, quantum networks will almost certainly require interfaces between different physical systems, such as atoms and low loss fibers. These interfaces will require low loss, high efficiency and low noise frequency conversion. Optical waveguides in nonlinear materials are ideal candidates for this task due to their inherent phase stability, high nonlinearity, flexibility, small footprint and modularity.
We are developing a quantum interface to convert photons at 397 nm, correspondent to the 40Ca+ transition, to photons in the telecom C-band, around 1550 nm. In order to bridge this huge energy gap, we exploit the process of sum frequency generation (SFG) in periodically-poled, rubidium-exchanged potassium titanyl phosphate (Rb:KTP) waveguides. Rb:KTP waveguides are ideal candidates for SFG due to their unique combination of high nonlinear coefficients, a wide transmission window extending from infrared to ultraviolet, high photorefractive damage resistance and the possibility to achieve poling periods in the µm range.
Here, we show our technique for the production of those waveguides, discuss a model for the refractive index distribution in our waveguides and present some methods for assessing discrepancies between the model and our waveguides.