Hannover 2013 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 43: Poster II

Q 43.60: Poster

Wednesday, March 20, 2013, 16:00–18:30, Empore Lichthof

Buried Rb-exchanged waveguides in KTP — •Christof Eigner, Helge Rütz, Olga Driesner, Raimund Ricken, Hubertus Suche, and Christine Silberhorn — Universität Paderborn, Integrierte Quantenoptik, Warburger Str. 100, D-33098 Paderborn

Waveguides fabricated by Rb-ion-exchange in Potassiumtytanylphosphate (KTP) allow for highly efficient χ⁽²⁾- processes like parametric down-conversion (PDC) within the whole transparency range of KTP. Guiding in both, TM- and TE-polarization, together with a periodic poling, allows for a variety of quasi-phase matching.

We have expanded the usual waveguide fabrication process by a subsequent surface-near reversed exchange of Rb against K to achieve a buried index profile. To our knowledge, this is the first report on fabrication and characterization of such buried Rb-exchanged waveguides in KTP.

The buried index profile results in symmetrized mode-field distributions which offer several advantages: improved overlap of the mode-fields for χ⁽²⁾-processes, reduced influence of surface imperfections on the scattering losses, enhanced fiber-coupling efficiencies and an improved control over single-mode guiding. We characterize the waveguides in terms of propagation losses and non-critically phasematched type-II second harmonic generation. In addition, first results of electric field induced periodic poling of buried Rb-exchanged waveguides are presented.