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    Area of Science:

    • Physics
    • Laser Science
    • Particle Accelerators

    Background:

    • Generation of ultrashort coherent radiation in the extreme-ultraviolet (EUV) and soft X-ray regimes is crucial for various research fields.
    • Existing methods for producing such radiation face limitations in power and scale.

    Purpose of the Study:

    • To introduce and analyze a novel scheme for generating coherent harmonic radiation.
    • To achieve high-power EUV and soft X-ray radiation using off-resonance seed laser modulation.

    Main Methods:

    • Modulating the angular distribution of an electron beam (e beam) in an undulator (modulator) using an off-resonance seed laser.
    • Introducing strong coherent micro-bunching into the e beam after passing through a dispersion section.
    • Utilizing theoretical analysis and simulations to validate the proposed method.

    Main Results:

    • The off-resonance seed laser, with a wavelength different from the undulator's resonant wavelength, effectively modulates the electron beam.
    • The dispersion section induces high-order harmonic components of the seed laser within the micro-bunched electron beam.
    • Simulations confirm the generation of coherent EUV and soft X-ray radiation.

    Conclusions:

    • The proposed method offers a promising pathway for generating coherent EUV and soft X-ray radiation.
    • This technique can achieve sub-gigawatt power levels within a meter-scale undulator (radiator).
    • The method provides a scalable and efficient approach for advanced light source development.