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    This study introduces a new method for asynchronous optical sampling terahertz spectroscopy using free-running lasers. The technique corrects timing jitter for high-resolution broadband terahertz measurements, enhancing terahertz time-domain spectroscopy applications.

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    Area of Science:

    • Physical Sciences
    • Spectroscopy
    • Laser Physics

    Background:

    • Terahertz time-domain spectroscopy (THz-TDS) is a powerful technique for material characterization.
    • Asynchronous optical sampling (ASOPS) THz-TDS offers advantages but often requires precise laser stabilization.
    • Commercial Ti:Sapphire lasers typically operate with free-running repetition frequencies, posing challenges for ASOPS synchronization.

    Purpose of the Study:

    • To develop and validate a postprocessing algorithm for jitter correction in ASOPS THz-TDS.
    • To enable broadband THz spectroscopy with high spectral resolution using commercially available, free-running Ti:Sapphire lasers.
    • To demonstrate the robustness and long-term operational stability of the developed method.

    Main Methods:

    • Utilized asynchronous optical sampling (ASOPS) terahertz spectroscopy.
    • Employed commercially available, free-running Ti:Sapphire lasers without repetition frequency stabilization.
    • Developed a postprocessing algorithm leveraging the multiplied repetition frequency difference as a calibration signal for jitter correction.
    • Investigated robustness under varying temperatures and demonstrated long-term operation.

    Main Results:

    • Successfully corrected timing jitter in the ASOPS THz-TDS system.
    • Achieved broadband (2.5 THz) spectroscopy with high spectral resolution (82 MHz).
    • Demonstrated reliable long-term operation (over 63 hours) under varying temperatures, confirming robustness.

    Conclusions:

    • The developed postprocessing algorithm effectively corrects jitter in free-running laser ASOPS THz-TDS.
    • This method eliminates the need for precise laser frequency stabilization, broadening the applicability of ASOPS THz-TDS.
    • The technique provides a robust and accessible platform for high-resolution broadband terahertz spectroscopy.