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Related Experiment Video

Updated: Apr 26, 2026

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
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Published on: December 18, 2015

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Widely tunable quantum cascade laser-based terahertz source.

Andriy A Danylov, Alexander R Light, Jerry Waldman

    Applied Optics
    |August 5, 2014
    PubMed
    Summary
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    A novel tunable terahertz source was developed using quantum cascade laser upconversion. This compact device generates ultranarrowband radiation for spectroscopic applications.

    Area of Science:

    • Physics
    • Spectroscopy
    • Quantum Electronics

    Background:

    • Terahertz (THz) sources are crucial for spectroscopy and imaging.
    • Existing THz sources often lack tunability and narrow linewidth.
    • Compact and versatile THz generation methods are highly sought after.

    Purpose of the Study:

    • To demonstrate a compact, tunable, and ultranarrowband THz source.
    • To achieve continuous tunability in specific frequency regions.
    • To validate the source's performance using molecular rotational transitions.

    Main Methods:

    • Upconversion of a free-running quantum cascade laser (QCL) at 2.324 THz.
    • Utilizing a THz Schottky-diode-balanced mixer driven by a swept microwave source.
    • Characterization using a Fourier-transform spectrometer.

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    Related Experiment Videos

    Last Updated: Apr 26, 2026

    Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
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    Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

    Published on: December 18, 2015

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    Generation and Coherent Control of Pulsed Quantum Frequency Combs
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    Main Results:

    • Demonstration of a compact, tunable, ultranarrowband THz source with Δν∼1 MHz linewidth.
    • Generation of 1 μW tunable radiation in two frequency bands: ν(Laser) ± 0–50 GHz and ν(Laser) ± 70–115 GHz.
    • Successful tuning of the radiation through rotational transitions of CO, HDO, and D2O molecules.

    Conclusions:

    • The demonstrated method provides a viable approach for generating tunable, narrow-linewidth THz radiation.
    • The compact source is suitable for high-resolution spectroscopy of molecular gases.
    • This technology opens avenues for advanced THz applications requiring precise frequency control.