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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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42%-efficient single-pass cw second-harmonic generation in periodically poled lithium niobate.

G D Miller, R G Batchko, W M Tulloch

    Optics Letters
    |January 12, 2008
    PubMed
    Summary

    We developed a full-wafer fabrication process for periodically poled lithium niobate, achieving efficient 532-nm green light generation via second-harmonic generation. This method enables high-power laser applications by optimizing nonlinear optical properties.

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    Area of Science:

    • Photonics and Nonlinear Optics
    • Materials Science and Engineering
    • Solid-State Physics

    Background:

    • Periodically poled lithium niobate (PPLN) is crucial for nonlinear optical frequency conversion.
    • Efficient fabrication of large-area PPLN with precise domain structures remains a challenge.
    • Nd:YAG lasers require effective second-harmonic generation (SHG) for green light output.

    Purpose of the Study:

    • To present a novel full-wafer fabrication process for PPLN with a 6.5-micrometer domain period.
    • To demonstrate the efficacy of the fabricated PPLN for continuous-wave (cw) second-harmonic generation.
    • To characterize the nonlinear optical performance and conversion efficiency of the PPLN samples.

    Main Methods:

    • Developed a full-wafer fabrication technique for PPLN.

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    Last Updated: Jul 8, 2026

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  • Fabricated PPLN samples with dimensions of 53 mm length and 0.5 mm thickness.
  • Utilized single-pass cw 1064-nm Nd:YAG laser for second-harmonic generation experiments.

    • Main Results:

    • Achieved PPLN samples with 78% of the ideal nonlinear coefficient.
    • Measured a low-power conversion efficiency of 8.5%/W for SHG.
    • Demonstrated 42% power conversion efficiency, producing 2.7 W of 532-nm green light from 6.5 W of 1064-nm input.

    Conclusions:

    • The developed full-wafer fabrication process enables efficient production of PPLN for high-power nonlinear optical applications.
    • The fabricated PPLN exhibits excellent performance for cw second-harmonic generation of Nd:YAG lasers.
    • This advancement facilitates the generation of visible laser light with high efficiency and power.