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    We developed a fiber-monitored wavefront-shaping-based spectrum-customizable illumination system (FWSI) for ultrafast optics. This system enables rapid, programmable spectral customization of femtosecond laser pulses for advanced imaging applications.

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    Area of Science:

    • Ultrafast optics
    • Wavefront shaping
    • Laser illumination control

    Background:

    • Wavefront shaping offers precise control over ultrafast laser pulses.
    • Existing methods face limitations in speed and programmability for spectral customization.

    Purpose of the Study:

    • To present a fiber-monitored wavefront-shaping-based spectrum-customizable illumination system (FWSI).
    • To achieve rapid, programmable spectral customization of femtosecond laser pulses.
    • To enable flexible, multi-dimensional illumination engineering.

    Main Methods:

    • Utilized femtosecond sources and spectral transmission matrix (STM) calibration.
    • Employed multimode fiber waveguides and real-time spectral monitoring.
    • Leveraged modulator switching rates up to ~60 Hz.

    Main Results:

    • Demonstrated picosecond pulse illumination with energies up to ~0.98 nJ.
    • Achieved spectral customization spanning 1045-1075 nm.
    • Validated single-wavelength scanning, multi-wavelength management, and bandwidth adjustment.

    Conclusions:

    • The FWSI system enables rapid, multi-dimensional illumination control beyond traditional laser cavity limits.
    • This technology paves the way for advancements in photoacoustic imaging, multiphoton microscopy, and 3D sensing.
    • Offers flexible illumination engineering for diverse ultrafast optical applications.