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Terahertz beam characterization by temporal-spatial mapping with a reflecting echelon.

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    Optics Letters
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    This study introduces a new terahertz beam imaging method using temporal-spatial mapping algorithms. It accurately characterizes terahertz beams, even weak ones from time-domain spectroscopy systems.

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    Area of Science:

    • Optics and Photonics
    • Spectroscopy
    • Imaging Technology

    Background:

    • Terahertz (THz) time-domain spectroscopy (TDS) systems emit weak beams, making characterization challenging.
    • Existing beam imaging techniques are often impractical for large-size THz or laser beams in time-domain systems.

    Purpose of the Study:

    • To propose a novel terahertz beam imaging method for accurate characterization.
    • To enable imaging of both weak and large-size terahertz or laser beams.

    Main Methods:

    • Developed translation-scan (TTSM) and rotation-scan (RTSM) temporal-spatial mapping algorithms.
    • Employed a reflecting echelon scanning technique with temporal-spatial mapping inversion.

    Main Results:

    • Successfully obtained beam characteristics (size, shape, energy distribution) of a THz-TDS system.
    • Demonstrated the method's suitability for weak THz beams and large-size beams where conventional methods fail.

    Conclusions:

    • The proposed temporal-spatial mapping imaging method offers a practical solution for characterizing terahertz beams.
    • This technique expands the capability for beam analysis in time-domain systems, including those with large beams.