SAMOP 2023 – wissenschaftliches Programm
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QI: Fachverband Quanteninformation
QI 24: Integrated Photonics II (joint session Q/QI)
QI 24.2: Vortrag
Mittwoch, 8. März 2023, 17:15–17:30, A320
Diced ridge waveguides in titanium indiffused lithium niobate — •Michelle Kirsch, Christian Kießler, Christof Eigner, Harald Herrmann, and Christine Silberhorn — Paderborn University, Integrated Quantum Optics, Institute for Photonic Quantum Systems (PhoQS), Warburger Str. 100, 33098 Paderborn, Germany
Lithium niobate (LN) is a widely used platform for integrated optical devices due to its optical properties, especially the high second order nonlinearity. Well-established titanium indiffused waveguides (Ti:LN) are limited in the ability of creating tightly confined fields due to the low index contrast. Another limitation in Ti:LN waveguide devices is the occurrence of intensity induced photorefractive damage inhibiting applications with high optical intensities in the waveguides. To counteract these challenges we use a ridge waveguide structure to achieve higher confinement in horizontal direction by precision diamond blade dicing in Ti:LN. We analysed the properties of the guided modes in dependence of the waveguide geometry for 1550 nm. Furthermore, we fabricated periodically poled ridge waveguides and characterized the second harmonic generation process by measuring the phase matching function at a pump wavelength of 1550 nm and the efficiency. Here we show an efficiency of 9.44 %W−1cm−2. Moreover, we investigated the occurrence of photorefractive damage in the ridge waveguides by measuring the second harmonic power in dependence of the pump power. Here we show a high damage resistance up to a pump power of 500 mW.