Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 6: Solid State Quantum Optics I

Q 6.3: Talk

Monday, March 11, 2024, 11:30–11:45, HS 3118

An ultra-broadband, integrated mid-infrared photon pair source — •Abira Gnanavel, Franz Roeder, René Pollmann, Olga Brecht, Christof Eigner, Laura Padberg, 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 quantum optical coherence tomography or entangled two-photon absorption.

Here, we present a type II PDC source realised in a 40 mm long in-house fabricated, dispersion engineered periodically poled Ti:LiNbO3 waveguide yielding ultra-broadband, non-degenerate photon pairs with photons in the near-infrared and mid-infrared regime. A broad spectrum is achieved by matching both group velocities and group velocity dispersion of the signal and idler photons centered at 850 nm and 2800 nm, respectively. The spectral bandwidth of the photons exceeds 23 THz 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. This is especially desirable for ultrafast spectroscopy applications because it enables better measurement precision. We present first measurement results of the generated PDC light which are in high correspondence with the simulations.