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Electro-optically tunable, multi-wavelength optical parametric generators in aperiodically poled lithium niobates.

Y H Chen1, H P Chung, W K Chang

  • 1Department of Optics and Photonics, National Central University, Jhongli 320, Taiwan. yhchen@dop.ncu.edu.tw

Optics Express
|December 25, 2012
PubMed
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We developed new electro-optically tunable optical parametric generators using engineered aperiodically poled lithium niobate crystals. These devices show significantly enhanced tuning rates for multi-wavelength generation in the near-infrared.

Area of Science:

  • Photonics and Optics
  • Materials Science
  • Nonlinear Optics

Background:

  • Optical parametric generators (OPGs) are crucial for tunable light sources.
  • Electro-optic (EO) tuning offers precise control over OPG output wavelengths.
  • Aperiodically poled lithium niobate (APPLN) crystals enable multi-wavelength generation but require enhanced tunability.

Purpose of the Study:

  • To design and demonstrate electro-optically tunable, multi-wavelength OPGs using APPLN.
  • To enhance the electro-optic tunability of APPLN-based OPGs.
  • To achieve simultaneous multiple signal wavelength generation with improved EO tuning rates.

Main Methods:

  • Fabrication of APPLN crystals using the aperiodic optical superlattice (AOS) technique.
  • Engineering the APPLN domain structure during crystal fabrication and design.

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  • Increasing the length or block-number difference of opposite-polarity domains for enhanced EO effect.

    • Main Results:

    • Demonstrated electro-optically tunable, multi-wavelength OPGs based on engineered APPLN.
    • Achieved several orders of magnitude enhancement in EO tuning rate compared to conventional OPGs.
    • Successfully demonstrated simultaneous multiple signal wavelength generation in the 1500-1600 nm near-infrared band.

    Conclusions:

    • The proposed engineering techniques significantly improve EO tunability in APPLN OPGs.
    • These enhanced OPGs are suitable for precise, multi-wavelength generation in the near-infrared.
    • The study advances the development of tunable nonlinear optical devices for various applications.