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Engineering competing nonlinearities.

O Bang, C B Clausen, P L Christiansen

    Optics Letters
    |December 15, 2007
    PubMed
    Summary
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    Weakly modulating quasi-phase-matching gratings engineer nonlinearities. This allows engineered cubic nonlinearity to dominate, decreasing the intensity threshold for nonlinear competition in materials like lithium niobate.

    Area of Science:

    • Nonlinear optics
    • Materials science

    Background:

    • Quasi-phase-matching (QPM) gratings are crucial for nonlinear optical processes.
    • Engineering nonlinearities in materials is key for advanced optical applications.

    Purpose of the Study:

    • To investigate the engineering of average quadratic and induced cubic nonlinearities via QPM grating modulation.
    • To analyze the relative strengths of quadratic and cubic nonlinearities in lithium niobate (LiNbO3).

    Main Methods:

    • Theoretical analysis of QPM grating modulation.
    • Calculation of average quadratic and induced cubic nonlinearities.
    • Comparison of intrinsic and induced nonlinearities.

    Main Results:

    • Weak modulation of QPM gratings enables control over both quadratic and cubic nonlinearities.

    Related Experiment Videos

  • The induced average cubic nonlinearity can be engineered to surpass the intrinsic cubic nonlinearity.
  • This engineering reduces the intensity threshold for the balance between quadratic and cubic nonlinearities.

    • Conclusions:

    • Engineered QPM gratings offer a pathway to tailor nonlinear optical responses.
    • Dominant engineered cubic nonlinearity can be achieved at lower intensities.
    • This provides new possibilities for controlling light-matter interactions in nonlinear media.