SAMOP 2023 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 39: Quantum Optics & Nano-Optics

Q 39.5: Talk

Wednesday, March 8, 2023, 15:30–15:45, F342

Two-Step Frequency Conversion from 637nm to telecom wavelengths in a PPLN waveguide — •Joscha Hanel — AG Nanooptik, Humboldt-Universität zu Berlin — AG Ding, ATMOS, Leibniz Universität Hannover

In the future, the reliable on-demand generation of single photons at telecommunication wavelengths will be an essential tool in mid- to long-range quantum communication networks. However, many known single photon sources operate at wavelengths in the visible or near-infrared, where transmission in telecommunication fibers is far from optimal. A promising technology to bridge this wavelength gap is quantum frequency conversion. In this talk, a novel device is presented that was designed to convert light from 637nm to telecommunication wavelengths using difference frequency generation (DFG). The heart of the device is a periodically poled LiNbO3 waveguide with two poling sections, allowing two consecutive DFG steps in a single waveguide using just one pump laser. While comparable one-step conversions have been performed in the past (e.g. Dréau et al., Phys. Rev. Applied 9, 064031 (2018)), this two-step approach promises a far better signal-to-noise ratio while keeping coupling losses minimal.