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    Area of Science:

    • Physics
    • Quantum Optics
    • Materials Science

    Background:

    • Terahertz (THz) quantum cascade lasers (QCLs) offer compact, high-power radiation with narrow linewidths.
    • THz QCLs are promising for high-resolution spectroscopy, heterodyne detection, and coherent imaging.

    Purpose of the Study:

    • To develop a coherent swept-frequency delayed self-homodyning method for THz imaging and materials analysis.
    • To exploit the phase-stability of THz QCLs for enhanced detection capabilities.

    Main Methods:

    • Utilized laser feedback interferometry with a THz QCL.
    • Implemented a coherent swept-frequency delayed self-homodyning technique.
    • Determined the relationship between laser feedback parameters and the complex refractive index.

    Main Results:

    • Obtained amplitude-like and phase-like images with minimal signal processing.
    • Demonstrated accurate extraction of complex refractive indices from target materials.
    • Achieved a compact, integrated system combining local oscillator, mixer, and detector within a single laser.

    Conclusions:

    • The developed method provides a compact and easy-to-implement system for THz imaging and materials analysis.
    • This technique enables high-accuracy extraction of complex refractive indices.
    • The integrated laser system simplifies THz spectroscopy and imaging applications.