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    We introduce dual-vortex-comb spectroscopy (DVCS), merging dual-comb spectroscopy and optical vortices for precise angle measurements. This novel technique enables dimensional conversion between angle and interferometric phase, expanding optical metrology applications.

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    Area of Science:

    • Optics and Photonics
    • Metrology
    • Spectroscopy

    Background:

    • Dual-comb spectroscopy (DCS) is a powerful tool for high-resolution spectral measurements.
    • Optical vortices possess orbital angular momentum (OAM) and a helical phase structure.
    • Integrating DCS with optical vortices has not been previously explored for dimensional expansion.

    Purpose of the Study:

    • To propose and demonstrate a novel measurement concept, dual-vortex-comb spectroscopy (DVCS).
    • To extend dual-comb spectroscopy into angular dimensions.
    • To explore the potential of optical vortices in enhancing metrological capabilities.

    Main Methods:

    • Combining dual-comb spectroscopy with optical vortices carrying orbital angular momentum.
    • Utilizing the helical phase structure of optical vortices to encode angular information.
    • Performing a proof-of-principle experiment to measure in-plane azimuth angles.

    Main Results:

    • Demonstrated in-plane azimuth-angle measurements with an accuracy of approximately 0.1 mrad after cyclic error correction.
    • Verified the origin of cyclic errors through simulation.
    • Showcased that the measurable angle range can be controlled by the topological number of optical vortices.

    Conclusions:

    • Achieved the first demonstration of dimensional conversion between in-plane angle and dual-comb interferometric phase.
    • Established DVCS as a viable technique for angular metrology.
    • This work significantly expands the applicability of optical frequency comb metrology into new dimensions.