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Related Experiment Video

Updated: Jun 19, 2026

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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Intracavity second-harmonic generation with a periodically domain-inverted LiTaO(3) device.

Y Kitaoka, K Mizuuchi, K Yamamoto

    Optics Letters
    |November 3, 2009
    PubMed
    Summary

    Efficient intracavity second-harmonic generation (SHG) was achieved using a novel quasi-phase-matched (QPM) device in lithium tantalate. This method produced 13-mW green light without optical distortion, showcasing a significant advancement in laser technology.

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    First-order quasi-phase-matched second-harmonic generation in a LiTaO(3) waveguide.

    Applied optics·2010
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    Generation of 340-nm light by frequency doubling of a laser diode in bulk periodically poled LiTaO(3).

    Optics letters·2009
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    Highly efficient quasi-phase-matched second-harmonic generation by frequency doubling of a high-frequency superimposed laser diode.

    Optics letters·2009
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    Milliwatt-order blue-light generation in a periodically domain-inverted LiTaO(3) waveguide.

    Optics letters·2009
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    Waveguide second-harmonic generation device with broadened flat quasi-phase-matching response by use of a grating structure with located phase shifts.

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    31%-efficient blue second-harmonic generation in a periodically poled MgO:LiNbO3 waveguide by frequency doubling of an AlGaAs laser diode.

    Optics letters·2007

    Area of Science:

    • Nonlinear Optics
    • Solid-State Lasers
    • Materials Science

    Background:

    • Intracavity second-harmonic generation (SHG) is crucial for visible laser light sources.
    • Quasi-phase-matched (QPM) devices offer efficient frequency conversion.
    • Lithium tantalate (LiTaO3) is a promising material for nonlinear optical applications.

    Purpose of the Study:

    • To demonstrate efficient intracavity SHG using a bulk-type QPM LiTaO3 device.
    • To minimize optical losses associated with domain inversion.
    • To achieve high-quality green light generation from a diode-pumped laser.

    Main Methods:

    • Fabrication of periodically domain-inverted LiTaO3 crystals via high-voltage application.
    • Optimization of internal loss using an annealing technique (<0.1%).

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  • Integration of the QPM SHG device into a diode-pumped Nd:YVO4 laser cavity.

    • Main Results:

    • Successful generation of 13-mW green light output.
    • Low pump power requirement of 130 mW.
    • Suppression of transverse mode distortion caused by photorefractive effects.

    Conclusions:

    • The developed bulk-type QPM SHG device in LiTaO3 enables efficient intracavity frequency doubling.
    • The annealing technique effectively reduces optical losses, enhancing device performance.
    • This approach provides a robust method for generating high-quality green laser light.