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    Area of Science:

    • Optics and Photonics
    • Quantum Electronics
    • Imaging Technology

    Background:

    • Terahertz (THz) imaging offers unique material characterization capabilities.
    • Current THz imaging systems often require cryogenic cooling, limiting portability and increasing complexity.
    • Developing cryogen-free THz imaging systems is crucial for widespread adoption.

    Purpose of the Study:

    • To develop a coherent THz imaging system that operates without cryogenic cooling.
    • To demonstrate the feasibility of using a pulsed-mode quantum cascade laser (QCL) as both a THz source and detector.
    • To achieve high-speed THz imaging with simultaneous amplitude and phase information.

    Main Methods:

    • Utilized a pulsed-mode quantum cascade laser (QCL) in a feedback interferometer configuration.
    • Implemented swept-frequency laser feedback interferometry for data acquisition.
    • Developed an interferometric detection scheme to capture both amplitude and phase images.

    Main Results:

    • Achieved cryogen-free operation of the THz imaging system.
    • Demonstrated simultaneous acquisition of amplitude and phase images.
    • Showcased the potential for 0.25 mega-pixel per second acquisition rates using microsecond pulses.
    • Inherently suppressed unwanted background radiation through the interferometric design.

    Conclusions:

    • The developed THz imaging system is compact and efficient, eliminating the need for cryogenics.
    • The system's high acquisition rate paves the way for real-time, video frame rate THz imaging.
    • This advancement has significant implications for various fields requiring rapid THz inspection and analysis.