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    Area of Science:

    • Optical Physics
    • Metrology
    • Spectroscopy

    Background:

    • Dual-comb microscopy offers high-speed and precision optical sampling by extracting amplitude and phase information.
    • Existing methods face limitations like mechanical scanning, low sampling efficiency, and system complexity.

    Purpose of the Study:

    • To introduce a scan-less spatiotemporal encoding approach for dual-comb microscopy.
    • To overcome limitations of traditional dual-comb microscopy, enhancing speed and simplifying system requirements.

    Main Methods:

    • Utilized free-space angular-chirp-enhanced delay (FACED) and a single-cavity dual-comb laser.
    • Employed spatiotemporal encoding to arrange and disperse laser beams, enabling scan-less operation.
    • Achieved 3D imaging by overcoming mechanical scanning and improving sampling efficiency.

    Main Results:

    • Demonstrated scan-less 3D imaging with nanometer precision at a rate of 330 Hz.
    • Achieved a 3D distance-imaging rate of 7 million pixels per second for microfabricated structures.
    • Facilitated ultrafast spectroscopic applications, 1-2 orders of magnitude faster than traditional methods.

    Conclusions:

    • The developed spatiotemporal encoding method significantly enhances measurement speed and precision in dual-comb microscopy.
    • The system eases stringent laser parameter requirements, making it more robust and versatile.
    • This advancement holds potential for broad applications in phase imaging, surface topography, distance ranging, and spectroscopy.