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Triggerless data acquisition in asynchronous optical-sampling terahertz time-domain spectroscopy based on a dual-comb

Makoto Okano, Shinichi Watanabe

    Optics Express
    |October 27, 2022
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel triggerless terahertz spectroscopy method using phase-locked optical frequency combs. The technique achieves high frequency stability and accuracy for precise terahertz measurements.

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    Area of Science:

    • Spectroscopy
    • Optics
    • Physics

    Background:

    • Terahertz time-domain spectroscopy (THz-TDS) traditionally requires trigger signals and optical delay lines.
    • Achieving high stability and accuracy in THz-TDS is crucial for detailed material characterization.

    Purpose of the Study:

    • To demonstrate a new asynchronous optical-sampling THz-TDS (ASOPS THz-TDS) system that eliminates the need for trigger signals and optical delay lines.
    • To evaluate the performance, stability, and accuracy of this novel ASOPS THz-TDS system.

    Main Methods:

    • Utilizing two mutually phase-locked optical frequency combs with slightly different repetition rates.
    • Implementing tight stabilization of repetition frequencies for triggerless data acquisition.
    • Phase-locking the combs to a frequency standard for enhanced accuracy.

    Main Results:

    • Successful demonstration of ASOPS THz-TDS without trigger signals or delay lines.
    • Achieved fractional frequency stability of ~8.0 × 10-17 after 730 seconds.
    • Accurate characterization of water vapor absorption line at 0.557 THz, matching HITRAN database predictions.

    Conclusions:

    • The developed triggerless ASOPS THz-TDS system offers high precision and stability.
    • This method is suitable for accurate terahertz spectral measurements, validated by water vapor characterization.
    • Eliminates the need for complex trigger synchronization and optical delay lines in THz-TDS setups.