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SAMOP 2023 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 60: Photonics IV

Q 60.5: Talk

Friday, March 10, 2023, 12:00–12:15, A320

Spectral tailoring of quasi-phase-matched nonlinear processes in Ti:LiNbO3 waveguides using microheaters — •Jonas Babai-Hemati, Felix vom Bruch, Harald Herrmann, and Christine Silberhorn — Paderborn University, Integrated Quantum Optics, Institute for Photonic Quantum Systems (PhoQS), Warburger Str. 100, 33098 Paderborn, Germany

Nonlinear optical conversion processes, such as second harmonic generation (SHG) or parametric down-conversion are at the heart of many quantum optic applications. Various efficient devices have been demonstrated using periodically poled Ti-indiffused waveguides in LiNbO3 (PPLN). Their performance, however, is often limited by inhomogeneities induced by an imperfect fabrication. We demonstrate that this problem can be mitigated by counteracting the inhomogeneities by a distinct temperature profile along the waveguide. Here, we theoretically and experimentally investigate a cascade of microheaters, inducing specifically tailored temperature profiles to improve the performance of an SHG-process. With an optimized temperature profile, we could modify the phase-matching resulting from nonuniform domain inversion or varying waveguide cross-section towards ideal spectra. Furthermore, our method also opens new possibilities to tailor spectra of nonlinear optical processes, allowing for highly efficient and tuneable generation of single photons.

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