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Modeling and optimization of third-harmonic generation with dual-wavelength injection.

Zhichao Shen, Xiangbing Wang, Ke Yao

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    |May 4, 2026
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    Summary

    Dual-wavelength injection enhances spectral broadening for stimulated rotational Raman scattering (SRRS) ultraviolet output. Optimizing energy ratios and crystal angles balances efficiency and spectral width, advancing laser-plasma instability suppression.

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    Area of Science:

    • Nonlinear optics
    • Laser physics
    • Plasma physics

    Background:

    • Stimulated rotational Raman scattering (SRRS) with signal-beam injection achieves kilojoule-level UV output exceeding 1% bandwidth.
    • This technique shows promise for mitigating laser-plasma instabilities.

    Purpose of the Study:

    • To enhance spectral broadening in SRRS by investigating third-harmonic generation (THG) under dual-wavelength injection.
    • To develop a theoretical model for THG under dual-wavelength injection and analyze its effects on spectral properties.

    Main Methods:

    • Developed a coupled-wave dynamical model for THG under dual-wavelength injection.
    • Performed numerical simulations to analyze the influence of energy ratio and crystal detuning angle.

    Main Results:

    • Dual-wavelength injection in THG generates multiple spectral components, enhancing spectral broadening.
    • Optimized dual-wavelength energy ratio and crystal detuning angle achieve a balance between conversion efficiency and spectral broadening.

    Conclusions:

    • The study provides a theoretical framework for harmonic generation with dual-wavelength injection.
    • This approach offers potential for improved SRRS spectral broadening and multi-line frequency generation, aiding laser-plasma instability research.