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    Area of Science:

    • Ultrafast optics
    • Nonlinear optics
    • Quantum optics

    Background:

    • Carrier-envelope phase (φCEP) is critical for subcycle light-matter interactions.
    • Standard f-2f interferometry measures carrier-envelope offset frequency (fCEO) but struggles with high-bandwidth φCEP measurement.

    Purpose of the Study:

    • Introduce a novel f-2f polarization interferometry technique.
    • Enable unambiguous, high-bandwidth measurement of φCEP.
    • Advance ultrafast experimental capabilities.

    Main Methods:

    • Utilize spectral overlap from a traditional f-2f interferometer.
    • Evaluate the polarization state with linear optical components and balanced photodiodes.
    • Implement f-2f polarization interferometry for φCEP detection.

    Main Results:

    • Achieved unambiguous φCEP measurement over a 2π range.
    • Demonstrated detection speeds up to 60 kHz.
    • Showcased potential for single-shot φCEP detection at MHz rates.

    Conclusions:

    • f-2f polarization interferometry offers a significant advancement for measuring light pulse φCEP.
    • The technique is versatile for applications like φCEP stabilization, phase tagging, and controlling light-matter interactions.
    • This method enhances precision in ultrafast experiments.