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Related Experiment Video

Updated: Jan 8, 2026

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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Enhanced second-harmonic generation with four-wave-mixing broadened fundamental laser.

Xin Zeng, Lu Han, Zeze Chen

    Optics Express
    |December 19, 2025
    PubMed
    Summary

    Researchers enhanced visible laser generation by using four-wave-mixing (FWM) to broaden fiber laser spectra. This method achieved 1.52 times higher efficiency for second-harmonic generation (SHG), enabling high-power, low-noise green laser output.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Nonlinear Optics

    Background:

    • Single-pass second-harmonic generation (SHG) is crucial for high-power, continuous-wave, narrow-linewidth visible lasers.
    • Improving conversion efficiency in SHG schemes remains a significant challenge.

    Purpose of the Study:

    • To demonstrate enhanced single-pass SHG conversion efficiency.
    • To overcome limitations in conventional phase-modulated laser schemes for visible laser generation.

    Main Methods:

    • Utilizing four-wave-mixing (FWM) to broaden the spectrum of phase-modulated fundamental lasers.
    • Co-amplifying two phase-modulated seeds in an ytterbium-doped fiber amplifier.
    • Employing cascaded FWM to redistribute power into multimode spectra.

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    Main Results:

    • Achieved 1.52 times higher efficiency compared to conventional phase-modulated laser schemes in sum-frequency generation (SFG).
    • Generated a green laser with up to 76.9 W output power at 531.5 nm.
    • Reached a conversion efficiency of 24.2% while maintaining relative intensity noise (RIN) below -120 dBc/Hz above 2 kHz.

    Conclusions:

    • The FWM-broadened fundamental laser approach offers a robust method for high-power visible laser generation.
    • This technique provides a straightforward route to achieving high-power, low-noise visible lasers.
    • The demonstrated method enhances SHG conversion efficiency significantly.