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Related Experiment Videos

Experimental demonstration of a pure third-order optical parametric downconversion process.

J Douady1, B Boulanger

  • 1Laboratoire de Spectrométrie Physique, Unité Mixte de Recherche 5588, Université Joseph Fourier & Centre National de la Recherche Scientifique, 140 Avenue de la Physique, BP 87, F-38402 Saint Martin d'Heres Cedex, France.

Optics Letters
|December 21, 2004
PubMed
Summary

This study demonstrates efficient third-order optical difference frequency generation using a KTiOPO4 crystal, producing 4.5 microJ/pulse at 1474 nm for quantum experiments.

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Area of Science:

  • Nonlinear optics
  • Quantum optics
  • Solid-state physics

Background:

  • Third-order optical difference frequency generation (ODFG) is a key process for generating new frequencies.
  • Efficient ODFG is crucial for advancements in quantum information science and spectroscopy.
  • Previous experiments have primarily focused on lower-order nonlinear processes.

Purpose of the Study:

  • To report the first experimental demonstration of third-order optical difference frequency generation.
  • To investigate the efficiency and purity of a cubic nonlinear process.
  • To explore the potential for generating three-photon entangled states.

Main Methods:

  • Utilized a phase-matched Potassium Titanyl Phosphate (KTiOPO4) crystal as the nonlinear medium.

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  • Employed picosecond pulses at pump wavelengths of 532 nm and 1665 nm.
  • Developed a specific experimental configuration to optimize the third-order nonlinear process.

    • Main Results:

    • Achieved efficient third-order optical difference frequency generation.
    • Generated 4.5 microJ/pulse of output at 1474 nm.
    • Confirmed the process as a pure cubic nonlinear interaction.

    Conclusions:

    • The demonstrated third-order ODFG is a significant advancement in nonlinear optics.
    • The high efficiency and purity of the process are promising for quantum applications.
    • This work paves the way for novel quantum experiments, including three-photon Greenberger-Horne-Zeilinger entanglement generation.