Telecoms-wavelength SPDC in femtosecond-laser-written PPLN waveguides

Peter J. Schlosser; Martin Walochnik; Bienvenu Ndagano; Philip Scherer; Ruaridh Smith; Massimiliano Proietti; Ludwig Prade; James Morris; Nicholas Smith; Florian Elsen; Lucia Caspani; Bernd Jungbluth; Henry T. Bookey; Loyd J. McKnight

doi:10.1117/12.2609014

5 March 2022 Telecoms-wavelength SPDC in femtosecond-laser-written PPLN waveguides

Peter J. Schlosser, Martin Walochnik, Bienvenu Ndagano, Philip Scherer, Ruaridh Smith, Massimiliano Proietti, Ludwig Prade, James Morris, Nicholas Smith, Florian Elsen, Lucia Caspani, Bernd Jungbluth, Henry T. Bookey, Loyd J. McKnight

Author Affiliations +

Proceedings Volume PC12004, Integrated Optics: Devices, Materials, and Technologies XXVI; PC120040L (2022) https://doi.org/10.1117/12.2609014
Event: SPIE OPTO, 2022, San Francisco, California, United States

Abstract

We have optimised the design and fabrication of low-loss type-I femtosecond-laser-written waveguides in PPLN that are single-transverse mode at 780 nm and 1560 nm and mode-matched to single-mode fibres. Spontaneous parametric downconversion (SPDC) has been demonstrated at 1560 nm when pumped with a 780 nm DFB laser and has been characterised with measurement of the second-order cross-correlation g(2) using superconducting nanowire detectors. This novel approach to waveguide fabrication in PPLN offers routes to high levels of integration and high generation rates which is important for many quantum-information applications.

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Peter J. Schlosser, Martin Walochnik, Bienvenu Ndagano, Philip Scherer, Ruaridh Smith, Massimiliano Proietti, Ludwig Prade, James Morris, Nicholas Smith, Florian Elsen, Lucia Caspani, Bernd Jungbluth, Henry T. Bookey, and Loyd J. McKnight "Telecoms-wavelength SPDC in femtosecond-laser-written PPLN waveguides", Proc. SPIE PC12004, Integrated Optics: Devices, Materials, and Technologies XXVI, PC120040L (5 March 2022); https://doi.org/10.1117/12.2609014

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KEYWORDS

Waveguides

Quantum key distribution

Telecommunications

Optical lithography

Quantum communications

Quantum information processing

Second-harmonic generation

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