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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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First-order quasi-phase-matched second-harmonic generation in a LiTaO(3) waveguide.

K Mizuuchi, K Yamamoto

    Applied Optics
    |October 2, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Researchers improved second-harmonic generation efficiency using a lithium tantalate waveguide. This advancement enables efficient blue light generation from lasers, with potential applications in optical devices.

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    Area of Science:

    • Nonlinear optics
    • Materials science

    Background:

    • Second-harmonic generation (SHG) is crucial for frequency conversion in optics.
    • Lithium tantalate (LiTaO3) waveguides are investigated for efficient nonlinear optical processes.

    Purpose of the Study:

    • To enhance conversion efficiency in a first-order quasi-phase-matched SHG device.
    • To characterize the fabrication process and performance of LiTaO3 waveguides for SHG.

    Main Methods:

    • Fabrication of a strongly confined LiTaO3 waveguide using proton exchange and rapid thermal annealing.
    • Experimental characterization of the device's performance with a Ti:Al2O3 laser and a diode laser.

    Main Results:

    • Achieved 18% conversion efficiency and 22 mW blue light power using a Ti:Al2O3 laser.
    • Generated 1.3 mW blue light with 4% conversion efficiency via direct diode-laser doubling.
    • Observed FWHM acceptance bandwidths of 2.5 °C (temperature) and 0.13 nm (wavelength).

    Conclusions:

    • The optimized LiTaO3 waveguide fabrication enhances light mode overlap for efficient SHG.
    • The device demonstrates high performance for blue light generation, suitable for various laser sources.