Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 15: Poster 1: Quanteninformation, Quanteneffekte, Laserentwicklung, Laseranwendungen, Ultrakurze Pulse, Photonik
Q 15.22: Poster
Montag, 14. März 2011, 16:30–19:30, P1
Fabrication and characterization of low-loss waveguides in lithium niobate — •Benjamin Weigand1, Andreas Lenhard1, Mareike Stolze2, Felix Rübel2, Sandra Wolff3, Johannes L’huillier2, and Christoph Becher1 — 1Universität des Saarlandes, FR 7.2 Experimentalphysik, Campus E2.6, 66123 Saarbrücken — 2Photonik-Zentrum Kaiserslautern e.V., Kohlenhofstr. 10, 67663 Kaiserslautern — 3Nano+Bio Center, Erwin-Schrödinger-Str. Geb. 13, 67663 Kaiserslautern
Waveguides in LiNbO3 find widespread applications in the fields of optical data transmission and quantum communication. In recent years ridge waveguide structures have attracted increasing interest as they offer significant advantages: the high refractive index contrast of ridge waveguides leads to both, strong mode confinement and mode overlap and thus to enhanced interaction of guided light fields. Furthermore, transmission losses are kept to a minimum. Our approach for fabrication of ridge waveguides is based on ultra-short laser pulse ablation, reactive ion etching or combinations of both methods. We compare waveguides produced with the different techniques and report on experimental investigations of transmission losses. We develop numerical models for designing waveguides with maximum mode overlap and minimum transmission losses and compare their predictions with the experimental results. Possible applications for the waveguide structures investigated here are experiments towards frequency conversion of single photons into the telecom band.