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Q: Fachverband Quantenoptik und Photonik

Q 42: Poster III

Q 42.24: Poster

Mittwoch, 8. März 2023, 16:30–19:00, Empore Lichthof

Characterization of an ultra-broadband integrated MIR photon pair source — •Abira Gnanavel, Franz Roeder, Olga Brecht, Christof Eigner, Benjamin Brecht, and Christine Silberhorn — Paderborn University, Integrated Quantum Optics, Institute for Photonic Quantum Systems (PhoQS), Warburger Straße 100, 33098 Paderborn, Germany

Broadband photon-pairs from parametric down-conversion (PDC) are of interest for spectroscopy at low light levels and applications such as entangled two-photon absorption.

Here, we present the design and characterization of periodically poled lithium niobate waveguides to generate ultra-broadband, non-degenerate photon pairs via type II PDC in the near-infrared and mid-infrared regime. We especially engineer the dispersion of those waveguides regarding the quasi-phase matching condition.

We present a condition where the signal and idler photons are group velocity matched and furthermore group velocity dispersion matched that is, they propagate at the same velocity but incur opposite amounts of chirp. The photons are generated in a periodically poled titanium-indiffused lithium niobate waveguide at wavelengths of 800nm and 2800nm, well suited for detection and MIR probing. We expect a spectral bandwidth exceeding 27 THz for this process when pumping with a low-cost cw laser diode. A higher bandwidth in the frequency domain results in tighter correlations in the time domain and thus an increased photon simultaneity, which is desirable for ultrafast spectroscopy applications because it enables better measurement precision.