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    Area of Science:

    • Nonlinear optics
    • Advanced microscopy techniques

    Background:

    • Pump-probe microscopy utilizes high repetition rate lasers and fast intensity modulation.
    • Conventional methods can be limited by sample heat dissipation and radiative states.

    Purpose of the Study:

    • To introduce novel pump-probe microscopy techniques.
    • To improve image quality and enable selective nonlinear interaction control.

    Main Methods:

    • Modulating inter-pulse time delay while keeping beam intensity constant.
    • Modulating relative polarization instead of beam intensity.

    Main Results:

    • Demonstrated experimental feasibility of the new modulation techniques.
    • Showcased improved performance for samples with poor heat dissipation or long-lived radiative states.

    Conclusions:

    • The presented methods offer significant advantages over conventional intensity modulation.
    • These techniques provide enhanced control over nonlinear interactions in pump-probe microscopy.