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    Area of Science:

    • Plasma Physics
    • Laser-Plasma Interactions
    • Attosecond Science

    Background:

    • Coherent wake emission requires high-contrast driving laser pulses.
    • Low laser contrast prevents the formation of long-scale-length plasma needed for emission.
    • Existing methods are limited by laser contrast requirements.

    Purpose of the Study:

    • To demonstrate a method for generating coherent wake emission with engineered low-contrast lasers.
    • To create an annular-shaped source of coherent extreme ultraviolet (XUV) pulses.
    • To develop an analytical model for the phenomenon.

    Main Methods:

    • Gently spoiling pristine laser contrast in an engineered manner.
    • Utilizing analytical modeling to describe the phenomenon.
    • Validating predictions through experimental and simulation studies.

    Main Results:

    • Coherent wake emission was inhibited in the center of the substrate, forming an annular source.
    • The analytical model accurately predicted the experimental and simulation outcomes.
    • Ion-acoustic velocity dependency on laser intensity was obtainable from emission patterns.

    Conclusions:

    • Engineered laser contrast provides a novel pathway to control coherent wake emission.
    • Annular XUV sources can be generated by inhibiting central emission.
    • The method offers potential for future applications in laser-driven particle acceleration and attosecond science.