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We previously reported a scheme for collinear emission of high-efficiency and
ultra-broadband photon pairs using chirped quasi-phase matching (QPM) periodically poled
stoichiometric lithium tantalate (PPSLT) ridge waveguides. However, collinearly emitted photon
pairs cannot be directly adopted for applications that are based on two-photon interference,
such as quantum optical coherence tomography (QOCT). In this work, we developed a chirped
QPM device with a slab waveguide structure. This device was designed to produce spatially
separable (photon pair non-collinear emission) parametric fluorescence photon pairs with an
ultra-broadband bandwidth in an extremely efficient manner. Using a non-chirped QPM slab
waveguide, we observed a photon pair spectrum with a full-width-at-half-maximum (FWHM)
bandwidth of 26 nm. When using a 3% chirped QPM slab waveguide, the FWHM bandwidth of
the spectrum increased to 190 nm, and the base-to-base width is 308 nm. We also confirmed a
generation efficiency of 2.4×106 pairs/(µW·s) using the non-chirped device, and a efficiency of
8×105 pairs/(µW·s) using the 3% chirped device under non-collinear emission conditions after
single-mode fiber coupling. This is, to the best of our knowledge, the first report of frequency
correlated photon pairs generation using slab waveguide device as a source. In addition, using
slab waveguides as photon pair sources, we performed two-photon interference experiments
with the non-chirped device and obtained a Hong–Ou–Mandel (HOM) dip with a FWHM of 7.7
µm and visibility of 98%. When using the 3% chirped device as photon pair source, the HOM
measurement gave a 2 µm FWHM dip and 74% visibility.

Rights:

• In Copyright
  © 2023 Optica Publishing Group. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.

Keyword: Quantum telecom, SLT, quasi phase matching, wavelength conversion

Date published: 2023-07-03

Publisher: Optica Publishing Group

Journal:

• OPTICS EXPRESS (ISSN: 10944087) vol. 31 issue. 14 p. 23551-23562

Funding:

• Ministry of Education, Culture, Sports, Science and Technology Grant No. JPMXS0118067634
• Cabinet Office, Government of Japan PRISM
• Japan Society for the Promotion of Science Grant No. 21H04444
• MEXT WISE Program
• Core Research for Evolutional Science and Technology Grant No. JPMJCR1674

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1364/oe.488978

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Updated at: 2024-08-10 08:30:09 +0900

Published on MDR: 2024-08-10 08:30:10 +0900