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Open-source 3D-printed terahertz pulse time-domain holographic detection module.

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    We developed a 3D-printable holographic detection module for measuring pulsed terahertz fields. This open-source hardware simplifies terahertz imaging and optical vortex characterization.

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    Area of Science:

    • Optics and Photonics
    • Terahertz Spectroscopy
    • 3D Printing Applications

    Background:

    • Accurate measurement of terahertz (THz) fields is crucial for various scientific and technological applications.
    • Existing THz detection methods can be complex and time-consuming, requiring specialized equipment and expertise.
    • The integration of 3D printing offers a pathway to create accessible and reproducible experimental setups.

    Purpose of the Study:

    • To develop and validate a novel holographic detection module for spatially resolved measurement of pulsed THz fields.
    • To leverage 3D printing for creating easily reproducible and universal optical mounts for THz detection systems.
    • To simplify the experimental procedure for THz field distribution measurements and system alignment.

    Main Methods:

    • A holographic detection module utilizing an electro-optical detection scheme with a wide-aperture ZnTe crystal, crossed polarizers, and a matrix photodetector.
    • Employing a motorized translation stage for time-delay scanning to achieve spatially resolved measurements in a single scan.
    • Utilizing 3D-printed mounts for optical elements, integrated into an optical cage system for simplified assembly and adjustment.

    Main Results:

    • Successfully measured the spatial distribution of pulsed THz fields, including unperturbed fields and vortex fields generated by a spiral phase plate.
    • Detected optical vortices with topological charges ranging from 2 to 4 within the 0.3–1.1 THz spectral range.
    • Demonstrated the effectiveness of the 3D-printed mounts and the simplified alignment process for THz imaging systems.

    Conclusions:

    • The developed holographic detection module provides an efficient and accessible method for characterizing pulsed THz fields.
    • The open-source, 3D-printable design significantly lowers the barrier for researchers to implement advanced THz imaging techniques.
    • The module facilitates the detection of complex THz field structures, such as optical vortices, with high fidelity.