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    This study analyzes a terahertz interferometric materials analysis scheme using quantum cascade lasers. The research finds the scheme is most sensitive to phase fluctuations and best suited for analyzing lossy materials.

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    Area of Science:

    • Terahertz (THz) spectroscopy and sensing
    • Quantum cascade laser (QCL) applications
    • Interferometric measurement techniques

    Background:

    • Self-mixing interferometry with THz quantum cascade lasers offers a novel approach for materials analysis.
    • Understanding the sensitivity and limitations of this scheme is crucial for its practical application.

    Purpose of the Study:

    • To investigate the influence of various operational and system parameters on the performance of a THz self-mixing interferometric scheme.
    • To identify the key factors affecting experimental uncertainties in materials characterization using this technique.

    Main Methods:

    • Systematic examination of laser operating parameters, target properties, and system configurations.
    • Analysis of the impact of calibration standard quality on measurement accuracy.
    • Evaluation of the scheme's sensitivity to interferometric phase fluctuations.

    Main Results:

    • The interferometric phase is identified as the primary source of sensitivity to external cavity length variations.
    • The scheme demonstrates higher precision in determining extinction coefficients for lossy materials.
    • Experimental uncertainties are minimized under specific conditions related to material properties.

    Conclusions:

    • The THz self-mixing interferometric scheme is robust but sensitive to phase stability, particularly external cavity length.
    • Optimal performance for extinction coefficient determination is achieved with lossy materials.
    • Further refinement of operational parameters and calibration can enhance the scheme's utility.