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Three-dimensional terahertz imaging using swept-frequency feedback interferometry with a quantum cascade laser.

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    We developed a fast 3D terahertz imaging technique using a frequency-modulated quantum cascade laser. This method significantly speeds up data acquisition for high-resolution imaging applications.

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    Area of Science:

    • Optics and Photonics
    • Terahertz Science and Technology
    • Imaging Systems

    Background:

    • Traditional terahertz imaging often requires slow mechanical scanning.
    • Achieving high resolution in 3D terahertz imaging presents significant challenges.
    • Compact and efficient terahertz sources are crucial for practical applications.

    Purpose of the Study:

    • To demonstrate a novel, fast, and compact 3D terahertz imaging system.
    • To improve data acquisition rates in terahertz imaging.
    • To achieve high depth resolution using a self-mixing scheme.

    Main Methods:

    • Utilized frequency modulation of a quantum cascade laser.
    • Implemented a compact self-mixing interferometry setup.
    • Employed a novel data acquisition scheme to avoid mechanical scanning.

    Main Results:

    • Achieved coherent 3D terahertz imaging.
    • Demonstrated significantly faster acquisition rates than conventional methods.
    • Obtained a depth resolution better than 0.1 μm.
    • Maintained a low power noise spectral density below -50 dB/Hz.

    Conclusions:

    • The proposed self-mixing scheme offers a simple and effective approach for rapid 3D terahertz imaging.
    • This technique enables high-resolution imaging with reduced acquisition times.
    • The system's compactness and speed make it suitable for various applications.