---
_id: '59069'
abstract:
- lang: eng
  text: <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>
article_number: '593'
article_type: original
author:
- first_name: Christian
  full_name: Kießler, Christian
  id: '44252'
  last_name: Kießler
- first_name: Michelle
  full_name: Kirsch, Michelle
  id: '69553'
  last_name: Kirsch
- first_name: Sebastian
  full_name: Lengeling, Sebastian
  id: '44373'
  last_name: Lengeling
- first_name: Harald
  full_name: Herrmann, Harald
  id: '216'
  last_name: Herrmann
- first_name: Christine
  full_name: Silberhorn, Christine
  id: '26263'
  last_name: Silberhorn
citation:
  ama: Kießler C, Kirsch M, Lengeling S, Herrmann H, Silberhorn C. SPDC single-photon
    source in Ti-indiffused diced ridge LiNbO<sub>3</sub> waveguides. <i>Optics Continuum</i>.
    2025;4(3). doi:<a href="https://doi.org/10.1364/optcon.557439">10.1364/optcon.557439</a>
  apa: Kießler, C., Kirsch, M., Lengeling, S., Herrmann, H., &#38; Silberhorn, C.
    (2025). SPDC single-photon source in Ti-indiffused diced ridge LiNbO<sub>3</sub>
    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>
  bibtex: '@article{Kießler_Kirsch_Lengeling_Herrmann_Silberhorn_2025, title={SPDC
    single-photon source in Ti-indiffused diced ridge LiNbO<sub>3</sub> 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} }'
  chicago: Kießler, Christian, Michelle Kirsch, Sebastian Lengeling, Harald Herrmann,
    and Christine Silberhorn. “SPDC Single-Photon Source in Ti-Indiffused Diced Ridge
    LiNbO<sub>3</sub> 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>.
  ieee: 'C. Kießler, M. Kirsch, S. Lengeling, H. Herrmann, and C. Silberhorn, “SPDC
    single-photon source in Ti-indiffused diced ridge LiNbO<sub>3</sub> 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>.'
  mla: Kießler, Christian, et al. “SPDC Single-Photon Source in Ti-Indiffused Diced
    Ridge LiNbO<sub>3</sub> 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>.
  short: C. Kießler, M. Kirsch, S. Lengeling, H. Herrmann, C. Silberhorn, Optics Continuum
    4 (2025).
date_created: 2025-03-19T10:56:04Z
date_updated: 2025-03-19T16:03:25Z
department:
- _id: '15'
- _id: '623'
- _id: '288'
doi: 10.1364/optcon.557439
intvolume: '         4'
issue: '3'
language:
- iso: eng
publication: Optics Continuum
publication_identifier:
  issn:
  - 2770-0208
publication_status: published
publisher: Optica Publishing Group
status: public
title: SPDC single-photon source in Ti-indiffused diced ridge LiNbO<sub>3</sub> waveguides
type: journal_article
user_id: '216'
volume: 4
year: '2025'
...