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Conical harmonic generation in isotropic materials.

K D Moll1, D Homoelle, Alexander L Gaeta

  • 1School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, USA.

Physical Review Letters
|April 17, 2002
PubMed
Summary
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Researchers discovered a new nonlinear optical process for generating nth harmonic radiation using (2n+1)-order nonlinearity. This method enables odd- and even-harmonic generation and amplification in isotropic materials, simplifying phase matching in normal-dispersion media.

Area of Science:

  • Nonlinear Optics
  • Quantum Optics
  • Materials Science

Background:

  • Harmonic generation typically relies on specific material properties and phase-matching techniques.
  • Existing methods often struggle with generating even-order harmonics or require complex phase-matching conditions.

Purpose of the Study:

  • To introduce a novel class of nonlinear optical processes for harmonic generation.
  • To demonstrate the generation and amplification of both odd- and even-order harmonics.
  • To enable efficient phase matching in normal-dispersion materials without birefringence.

Main Methods:

  • Utilizing a (2n+1)-order nonlinearity for nth harmonic generation.
  • Employing isotropic materials to allow for both odd- and even-harmonic generation.

Related Experiment Videos

  • Investigating phase-matching conditions in normal-dispersion materials.

    • Main Results:

    • Demonstrated a new nonlinear optical process for generating nth harmonic radiation.
    • Achieved generation and amplification of odd- and even-order harmonics.
    • Confirmed phase matching is possible in normal-dispersion materials without birefringence.
    • Experimentally generated conical third-harmonic emission from sapphire.

    Conclusions:

    • The novel (2n+1)-order nonlinearity offers a versatile route for harmonic generation.
    • This process simplifies harmonic generation, particularly for even orders, in isotropic media.
    • The ability to phase match in normal-dispersion materials without birefringence is a significant advancement.