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    Area of Science:

    • Physics
    • Optics
    • Materials Science

    Background:

    • High-order harmonic generation (HHG) produces extreme ultraviolet (XUV) and soft X-ray radiation.
    • Coherent diffractive imaging (CDI) is a powerful lensless imaging technique.

    Purpose of the Study:

    • To generate highly coherent XUV sources using phase-matched HHG.
    • To demonstrate CDI using these novel XUV sources for sample imaging and reconstruction.
    • To explore the potential for compact soft X-ray microscopy.

    Main Methods:

    • Phase-matched high-order harmonic generation (HHG) in argon and helium gas cells.
    • Coherent diffractive imaging (CDI) utilizing a focused, narrow-bandwidth HHG source (~30 nm).
    • Imaging and reconstruction of both transmission and absorption samples.

    Main Results:

    • Generation of highly coherent XUV sources at ~30 nm and ~10 nm wavelengths.
    • Successful coherent diffractive imaging of transmission and absorption samples.
    • Reconstruction of a complex absorption sample using a tabletop HHG source.

    Conclusions:

    • Phase-matched HHG provides a viable route to compact, coherent XUV sources.
    • CDI with HHG illumination is effective for imaging diverse samples, including complex absorbers.
    • This work advances the development of compact soft X-ray microscopes for biological applications.