article published Christian Kießler author 44252 Michelle Kirsch author 69553 Sebastian Lengeling author 44373 Harald Herrmann author 216 Christine Silberhorn author 26263 15 department 623 department 288 department <jats:p>Stable and bright single photon sources are key components for future quantum applications. A simple fabrication method is an important requirement for such sources. Here, we present a single photon source based on diced ridge waveguides in titanium indiffused LiNbO<jats:sub>3</jats:sub>. These waveguides can be easily fabricated by combining planar titanium in-diffusion without lithographic patterning and easy-to-handle precision dicing. Such devices have the potential to generate high single photon rates because ridge structures are typically less prone to the photorefractive effect. We achieve waveguide propagation losses &lt;0.4dBcm and a SHG conversion efficiency of about 81%Wcm<jats:sup>2</jats:sup>. Harnessing a type-0 SPDC process to generate 1550 nm photons, we obtain a SPDC brightness of 3⋅10<jats:sup>5</jats:sup>1s⋅mW⋅nm, with a heralding efficiency of <jats:italic>η</jats:italic><jats:sub>h</jats:sub>=45% (<jats:italic>η</jats:italic><jats:sub>h,wg</jats:sub>=77.5% for the waveguide itself excluded setup losses) and a heralded second-order correlation function of <jats:italic>g</jats:italic><jats:sub>h</jats:sub><jats:sup>2</jats:sup>(0)&lt;0.003 at low pump powers.</jats:p> Optica Publishing Group2025 eng 2770-020810.1364/optcon.557439 43 C. Kießler, M. Kirsch, S. Lengeling, H. Herrmann, C. Silberhorn, Optics Continuum 4 (2025). Kießler, Christian, Michelle Kirsch, Sebastian Lengeling, Harald Herrmann, and Christine Silberhorn. “SPDC Single-Photon Source in Ti-Indiffused Diced Ridge LiNbO₃ Waveguides.” <i>Optics Continuum</i> 4, no. 3 (2025). <a href="https://doi.org/10.1364/optcon.557439">https://doi.org/10.1364/optcon.557439</a>. C. Kießler, M. Kirsch, S. Lengeling, H. Herrmann, and C. Silberhorn, “SPDC single-photon source in Ti-indiffused diced ridge LiNbO₃ waveguides,” <i>Optics Continuum</i>, vol. 4, no. 3, Art. no. 593, 2025, doi: <a href="https://doi.org/10.1364/optcon.557439">10.1364/optcon.557439</a>. Kießler, C., Kirsch, M., Lengeling, S., Herrmann, H., &#38; Silberhorn, C. (2025). SPDC single-photon source in Ti-indiffused diced ridge LiNbO₃ waveguides. <i>Optics Continuum</i>, <i>4</i>(3), Article 593. <a href="https://doi.org/10.1364/optcon.557439">https://doi.org/10.1364/optcon.557439</a> @article{Kießler_Kirsch_Lengeling_Herrmann_Silberhorn_2025, title={SPDC single-photon source in Ti-indiffused diced ridge LiNbO₃ waveguides}, volume={4}, DOI={<a href="https://doi.org/10.1364/optcon.557439">10.1364/optcon.557439</a>}, number={3593}, journal={Optics Continuum}, publisher={Optica Publishing Group}, author={Kießler, Christian and Kirsch, Michelle and Lengeling, Sebastian and Herrmann, Harald and Silberhorn, Christine}, year={2025} } Kießler C, Kirsch M, Lengeling S, Herrmann H, Silberhorn C. SPDC single-photon source in Ti-indiffused diced ridge LiNbO₃ waveguides. <i>Optics Continuum</i>. 2025;4(3). doi:<a href="https://doi.org/10.1364/optcon.557439">10.1364/optcon.557439</a> Kießler, Christian, et al. “SPDC Single-Photon Source in Ti-Indiffused Diced Ridge LiNbO₃ Waveguides.” <i>Optics Continuum</i>, vol. 4, no. 3, 593, Optica Publishing Group, 2025, doi:<a href="https://doi.org/10.1364/optcon.557439">10.1364/optcon.557439</a>. 590692025-03-19T10:56:04Z2025-03-19T16:03:25Z