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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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Dispersion-based control of modal characteristics for parametric down-conversion in a multimode waveguide.

Michał Karpiński1, Czesław Radzewicz, Konrad Banaszek

  • 1Faculty of Physics, University of Warsaw, ul. Hoża 69, 00-681 Warszawa, Poland. mkarp@fuw.edu.pl

Optics Letters
|March 2, 2012
PubMed
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We generated near-infrared photon pairs using a nonlinear waveguide. This method allows control over the spatial properties of nonclassical light, confirmed by beam quality measurements.

Area of Science:

  • Quantum optics
  • Nonlinear optics
  • Photonics

Background:

  • Spontaneous parametric down-conversion (SPDC) is a key process for generating nonclassical light.
  • Controlling the spatial modes of generated photon pairs is crucial for applications in quantum information and imaging.
  • Periodically poled nonlinear waveguides offer a compact and efficient platform for integrated photonic devices.

Purpose of the Study:

  • To demonstrate the generation of photon pairs in fundamental spatial modes.
  • To experimentally validate a versatile scheme for controlling the spatial characteristics of nonclassical light.
  • To characterize the spatial quality of heralded photons produced via intermodal dispersion.

Main Methods:

  • Type-II spontaneous parametric down-conversion (SPDC) was employed in a periodically poled potassium titanyl phosphate (KTiOPO4) nonlinear waveguide.

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  • The waveguide was designed to support multiple transverse modes, enabling intermodal dispersion control.
  • Beam quality factors were measured in the heralded regime to characterize the spatial properties of the generated photons.

    • Main Results:

    • Photon pairs in fundamental spatial modes were successfully generated.
    • A versatile scheme for controlling spatial characteristics of nonclassical light was experimentally demonstrated.
    • The beam quality of heralded photons was quantified, confirming the effectiveness of the intermodal dispersion control.

    Conclusions:

    • The study successfully demonstrated controlled generation of spatial modes for photon pairs.
    • Exploitation of intermodal dispersion in nonlinear waveguides provides a versatile method for tailoring nonclassical light.
    • This technique is promising for developing advanced integrated photonic devices for quantum technologies.