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Related Concept Videos

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Related Experiment Video

Updated: May 13, 2026

Differential Imaging of Biological Structures with Doubly-resonant Coherent Anti-stokes Raman Scattering (CARS)
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Digital coherent receiver for orbital angular momentum demultiplexing.

Aniceto Belmonte1, Juan P Torres

  • 1Technical University of Catalonia, BarcelonaTech, Department of Signal Theory and Communications, Barcelona 08034, Spain. belmonte@tsc.upc.edu

Optics Letters
|March 5, 2013
PubMed
Summary

We developed a coherent array receiver for detecting photon orbital angular momentum (OAM). This system digitally processes optical field information, enabling full OAM component retrieval.

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Area of Science:

  • Optics and Photonics
  • Quantum Information Science

Background:

  • Photon orbital angular momentum (OAM) is crucial for advanced optical communication and sensing.
  • Current methods for OAM detection can be complex and limited in scope.

Purpose of the Study:

  • To introduce a novel coherent array receiver for precise photon OAM detection.
  • To shift the complexity of OAM measurement from the optical to the digital domain.

Main Methods:

  • A coherent array receiver with multiple subapertures, each coupled to a single-mode fiber.
  • Digital samplers to coherently measure local electrical signals from each array element.
  • Computer processing of coherent electrical patterns to extract OAM information.

Main Results:

  • The receiver successfully maps the complex optical field in the image plane.
  • Coherent electrical signals are measured, facilitating digital processing.
  • Full amplitude and phase information of OAM components is retrievable.

Conclusions:

  • The proposed receiver offers a robust method for coherent OAM detection.
  • Digital processing simplifies and enhances the accuracy of OAM measurements.
  • This technology has potential applications in optical communications and quantum technologies.