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    Area of Science:

    • Optics and Photonics
    • Ultrafast Laser Technology
    • Pulse Shaping

    Background:

    • Spatial light modulators (SLMs) are crucial for optical wavefront manipulation.
    • Shaping ultrashort pulses in time-gated amplification systems presents challenges due to spectral aberrations.
    • Pixelated nature of SLMs can introduce unwanted spectral distortions.

    Purpose of the Study:

    • To demonstrate a novel application of SLMs for controlling ultrashort pulses in time-gated amplification.
    • To mitigate spectral aberrations caused by the pixelated SLM.
    • To achieve precise control over both spectral amplitude and phase of amplified pulses.

    Main Methods:

    • Utilizing a spatial light modulator (SLM) to introduce a group delay offset to ultrashort pulses.
    • Implementing time-gated amplification following SLM manipulation.
    • Leveraging phase wrapping on the SLM to create a phase grating effect.

    Main Results:

    • Spectral aberrations were successfully avoided by introducing a group delay offset.
    • A phase grating was generated via phase wrapping, controlling group delay spectrum and light fraction.
    • A one-dimensional SLM array proved sufficient for controlling both spectral amplitude and phase.

    Conclusions:

    • A novel and effective method for ultrashort pulse shaping in time-gated amplification systems was experimentally demonstrated.
    • The proposed technique overcomes limitations associated with SLM pixelation, enabling precise spectral control.
    • This advancement offers a simplified approach to manipulating both amplitude and phase of amplified ultrashort pulses.