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    Area of Science:

    • Optics and Photonics
    • Spectroscopy
    • Metrology

    Background:

    • Dual-comb interferometry uses phase-coherent laser frequency combs for broadband complex spectra measurement.
    • Current methods, often using modelocked lasers, are limited to ~kHz repetition rates, restricting measurement speed.
    • Applications span nonlinear microscopy, laser ranging, and molecular spectroscopy.

    Purpose of the Study:

    • To demonstrate a novel dual-comb interferometer utilizing electrooptic frequency combs.
    • To achieve ultra-high spectral measurement refresh rates exceeding current limitations.

    Main Methods:

    • Development of a dual-comb interferometer based on electrooptic frequency combs.
    • Measurement of consecutive complex spectra using the developed interferometer.

    Main Results:

    • Achieved an unprecedented ultra-high refresh rate of 25 MHz for spectral measurements.
    • Demonstrated the capability of electrooptic frequency combs in high-speed dual-comb interferometry.

    Conclusions:

    • The electrooptic dual-comb interferometer significantly advances measurement speed in optical spectroscopy.
    • This technology opens new avenues for scientific and metrology applications requiring ultrabroadband waveform measurement.